• Active galaxy: A galaxy that has a supermassive black hole at its center that is actively accreting matter, resulting in a bright nucleus and high levels of radiation.
  • Aerobraking: A technique used by spacecraft to slow down and enter into a stable orbit around a planet or other celestial body by using the drag of its atmosphere.
  • Aerodynamic heating: The heat generated by a spacecraft or other object as it moves through the atmosphere at high speeds.
  • Altitude: The angular distance of an object above the horizon measured in degrees.
  • Altitude: The height of a spacecraft or object above a reference point, such as sea level or the surface of a celestial body.
  • Altitude: The height of an object above a reference point, such as sea level or the Earth’s surface.
  • Anthropic principle: The idea that the observed properties of the universe must be compatible with the conscious and sapient life that observes it.
  • Anti-satellite weapons (ASATs): Weapons designed to target and destroy satellites in orbit.
  • Apogee: The point in an object’s orbit that is farthest from the body it is orbiting.
  • Apogee: The point in an object’s orbit where it is farthest from the Earth.
  • Apogee: The point in an orbit farthest from the celestial body being orbited.
  • Apogee: The point in an orbit when a celestial body is farthest from the body it is orbiting.
  • Artificial gravity: The simulated gravity created by rotating a spacecraft or other structure.
  • Artificial gravity: The simulated gravity created by rotation or other means in a spacecraft or space station, to mitigate the effects of microgravity on human physiology.
  • Artificial intelligence (AI) in space: The application of AI techniques and algorithms in space-related activities, such as satellite control, spacecraft navigation, and space situational awareness.
  • Artificial intelligence (AI): The simulation of human intelligence in machines that are programmed to think and learn.
  • Asteroid mining: The extraction of resources, such as water or metals, from asteroids for use in space exploration or commercial purposes.
  • Asteroid mining: The extraction of valuable materials from asteroids, such as water, precious metals, and rare earth elements.
  • Asteroid mining: The extraction of valuable resources, such as minerals or water, from asteroids.
  • Astrobiology: The study of the origin, evolution, distribution, and future of life in the universe.
  • Astrodynamics: The branch of astronautics that deals with the dynamics and control of spacecraft in space, including attitude control and propulsion systems.
  • Astrodynamics: The branch of dynamics that deals with the motion of celestial objects and spacecraft, including the calculation of trajectories, orbits, and the forces that affect them.
  • Astrology: The belief that the positions and movements of celestial bodies can influence human affairs and natural phenomena.
  • Astronaut: A person trained to pilot or serve as a crew member of a spacecraft.
  • Astronomical Unit (AU): A unit of distance used to express the distances between objects within our solar system, equal to the average distance between the Earth and the Sun, approximately 149.6 million kilometers.
  • Astronomy: The study of celestial objects, such as stars, planets, galaxies, and the universe as a whole.
  • Astrophysics: The study of the physical properties and behavior of objects and phenomena in the universe, including stars, galaxies, and cosmology.
  • Attitude control: The ability to control the orientation of a spacecraft in space.
  • Attitude control: The process of maintaining or adjusting a spacecraft’s orientation in space.
  • Augmented reality (AR) in space: The use of AR technology in space-related activities, such as spacecraft maintenance, and scientific research and public outreach.
  • Augmented reality (AR): A technology that superimposes digital information, such as images or text, onto the user’s view of the real world.
  • Autonomous systems: Self-governing or self-regulating systems that can operate without human intervention, such as autonomous spacecraft and robots.
  • Autonomous systems: Systems that can operate without human intervention, such as robot arms, drones, and rovers.
  • Azimuth: The compass direction of an object measured in degrees clockwise from due north.
  • Big Bang theory: The leading explanation for the birth of the universe, which states that the universe began as an incredibly hot and dense singularity and has been expanding and cooling ever since.
  • Big Bang: The prevailing scientific theory that explains the origins of the universe, proposing that the universe began as an extremely hot and dense state and has been expanding and cooling ever since.
  • Big Bang: The scientific theory that explains the origins of the universe, according to which the universe began as a hot, dense, and infinitely small point, and has been expanding ever since.
  • Big Bang: The theory that describes the origin and evolution of the universe, which began as an incredibly hot and dense state and has been expanding and cooling ever since.
  • Binary Stars: A system of two stars that orbit around a common center of mass.
  • Black hole: A region of space where the gravitational pull is so strong that nothing, including light, can escape. It is formed when a massive star dies and its core collapses under the force of gravity.
  • Black hole: A region of space with a gravitational pull so strong that nothing, including light, can escape from it.
  • Black Hole: A region of space with a gravitational pull so strong that nothing, including light, can escape it.
  • Black Hole: A region of space with a gravitational pull so strong that nothing, including light, can escape.
  • Black Hole: A region of space-time with a gravitational pull so strong that nothing, including light, can escape from it.
  • Black hole: A region of spacetime with such strong gravitational attraction that nothing, not even light, can escape from it.
  • Black hole: An extremely dense and massive object with a gravitational pull so strong that nothing, including light, can escape it.
  • Blueshift: The opposite of redshift, where light from a nearby object is shifted towards shorter, blue wavelengths.
  • Blueshift: The phenomenon where light from an object moving towards an observer is shifted towards shorter (blue) wavelengths.
  • Blueshift: The shift of an object’s spectral lines toward shorter wavelengths (blue) caused by its motion toward the observer.
  • Blueshift: The shift of an object’s spectral lines towards shorter wavelengths (the blue end of the spectrum) caused by the object moving towards the observer.
  • Brown dwarf: A type of star that is too small to sustain nuclear fusion in its core, characterized by its low luminosity and cool temperature.
  • Celestial body: A natural object in space, such as a planet, moon, comet, asteroid, or star.
  • Celestial Coordinate System: A system used to locate objects in the sky using two coordinates, the altitude (elevation) and azimuth (compass direction).
  • Collision avoidance: The practice of maneuvering a spacecraft or other object to avoid a collision with another object in space.
  • Comet: A small celestial body that orbits the Sun, typically made of ice and dust.
  • Communication satellite: A type of satellite used for the transmission of voice, data, or other information, via radio or other electromagnetic means, between two or more points on Earth or in space.
  • Computer vision in space: The application of computer vision techniques, such as image recognition, in space-related activities, such as satellite imagery analysis and robotic operations.
  • Computer vision: The ability of a computer to interpret and understand visual data from the environment, such as images or video.
  • Conjunction: When two or more objects in space come close to each other and have a risk of collision.
  • Cosmic background radiation: The faint afterglow of the Big Bang that fills the universe.
  • Cosmic background radiation: The faint afterglow of the Big Bang, which fills the universe and can be detected in all directions.
  • Cosmic Background Radiation: The faint radiation that fills the universe, thought to be the afterglow of the Big Bang.
  • Cosmic distance ladder: A method used to measure distances to objects in the universe by using a series of “rungs” of increasing distance, such as parallax, Cepheids, and Type Ia supernovae.
  • Cosmic Inflation: A period of rapid expansion that occurred a fraction of a second after the Big Bang, thought to be responsible for the uniformity of the universe on large scales.
  • Cosmic inflation: A theory that suggests that the universe underwent a period of rapid expansion in its first fraction of a second.
  • Cosmic microwave background (CMB): The faint afterglow of the Big Bang that fills the universe, with a temperature of approximately 2.725 Kelvin.
  • Cosmic microwave background radiation (CMB): The faint, roughly uniform glow of radiation left over from the Big Bang that fills the universe.
  • Cosmic microwave background radiation: The faint afterglow of the Big Bang, which fills the universe and can be detected in all directions as a faint microwave radiation.
  • Cosmic Microwave Background Radiation: The faint afterglow of the Big Bang, which fills the universe with a faint glow of light at microwave wavelengths.
  • Cosmic microwave background: The faint electromagnetic radiation that is thought to be left over from the Big Bang, which provides evidence for the origin of the universe.
  • Cosmic Microwave Background: The faint radiation that fills the universe in the microwave portion of the electromagnetic spectrum, thought to be the afterglow of the Big Bang.
  • Cosmic ray: High-energy particles that travel through space and can collide with Earth’s atmosphere, creating showers of secondary particles.
  • Cosmic ray: High-energy particles that travel through space, originating from sources such as supernovae and black holes.
  • Cosmic rays: High-energy particles and radiation that originate from outside the Solar System.
  • Cosmic rays: High-energy particles that originate from outside the Solar System, which can be dangerous for astronauts.
  • Cosmic Rays: High-energy particles that travel through space, some of which originate from outside the solar system.
  • Cosmic strings: hypothetical one-dimensional objects that could have been formed during the early universe and are thought to have extremely high density and enormous tension.
  • Cosmic web: A large-scale structure of the universe that is composed of galaxy clusters and superclusters connected by filaments of dark matter and gas.
  • Cosmic web: The large-scale structure of the universe, consisting of galaxy clusters and filaments of galaxies that are connected by vast cosmic voids.
  • Cosmology: The study of the origin, structure, and evolution of the universe as a whole.
  • Cosmology: The study of the origin, structure, and evolution of the universe.
  • Dark energy: A form of energy that is believed to be responsible for the accelerating expansion of the universe.
  • Dark Energy: A hypothetical form of energy that is thought to be driving the accelerating expansion of the universe. Please let me know if there are any other terms you would like to know more about or if you have any questions.
  • Dark energy: A hypothetical form of energy that is thought to be responsible for the accelerating expansion of the universe.
  • Dark energy: A hypothetical form of energy that is thought to be responsible for the acceleration of the expansion of the universe.
  • Dark energy: A hypothetical form of energy that is thought to make up approximately 68% of the universe and is responsible for the accelerating expansion of the universe.
  • Dark energy: A hypothetical form of energy that is thought to make up approximately 68% of the universe’s mass-energy density, but has not been directly observed.
  • Dark Energy: A mysterious form of energy that is thought to make up about 68% of the universe and is responsible for its accelerating expansion.
  • Dark energy: The hypothetical form of energy that is thought to be causing the accelerating expansion of the universe, but does not emit or absorb light, making it difficult to detect directly.
  • Dark flow: A mysterious large-scale motion of galaxy clusters that cannot be explained by the distribution of matter in the observable universe.
  • Dark matter: A form of matter that does not interact with electromagnetic forces, making it invisible to telescopes.
  • Dark matter: A form of matter that does not interact with light, but is detected through its gravitational effects.
  • Dark matter: A hypothetical form of matter that does not interact with light or other forms of electromagnetic radiation, making it difficult to detect.
  • Dark Matter: A hypothetical form of matter that does not interact with light or other forms of electromagnetic radiation, making it invisible to telescopes, but is thought to make up most of the matter in the universe.
  • Dark matter: A hypothetical form of matter that is thought to make up approximately 85% of the universe’s mass and does not emit, absorb, or reflect enough electromagnetic radiation to be observed directly.
  • Dark matter: A hypothetical form of matter that is thought to make up approximately 85% of the universe’s mass-energy density, but has not been directly observed.
  • Dark Matter: A mysterious form of matter that is thought to make up about 27% of the universe and does not interact with light or other forms of electromagnetic radiation.
  • Dark matter: The hypothetical form of matter that is thought to account for the majority of the universe’s mass, but does not emit or absorb light, making it difficult to detect directly.
  • Debris mitigation: The practice of reducing the amount of debris created by human activities in space.
  • Deep learning in space: A subfield of machine learning that involves the use of deep neural networks, which can learn and make predictions from large and complex datasets.
  • Deep Space Network (DSN): A network of large antennas and communication facilities used to communicate with spacecraft and other objects in deep space.
  • Deep space: The region of space outside of Earth’s atmosphere and beyond low Earth orbit.
  • Delta-V: A measure of the change in velocity required to perform a maneuver or to transfer between orbits.
  • Deorbit: The process of intentionally bringing a spacecraft or other object out of orbit and returning it to the Earth’s atmosphere.
  • development of techniques to mitigate those effects, such as countermeasures for bone loss, radiation exposure, and psychological stress.
  • Doppler effect: The change in frequency or wavelength of a wave caused by the motion of the source or observer.
  • Doppler Effect: The change in frequency or wavelength of a wave caused by the relative motion of the source and observer.
  • Doppler Effect: The change in frequency or wavelength of a wave in relation to the motion of the source or observer.
  • Dyson sphere: A hypothetical structure built around a star that would harness its energy to power a civilization.
  • Electric Propulsion: A type of rocket engine that uses electric power, typically from solar panels, to accelerate ions or electrons as propellant.
  • Elliptical galaxy: A type of galaxy characterized by its elliptical shape and lack of spiral arms.
  • Entry, descent, and landing (EDL): The process of a spacecraft or other object entering the atmosphere, descending to the surface, and safely landing on a celestial body.
  • Environmental control and life support system (ECLSS): The system on a spacecraft or space station that maintains a habitable environment for the crew, including air revitalization, water recycling, and waste management.
  • Escape velocity: The minimum speed an object must be traveling to break free of a celestial body’s gravitational pull and enter space.
  • Escape velocity: The minimum speed at which an object must be moving in order to escape the gravitational pull of a celestial body.
  • Escape velocity: The minimum speed needed for an object to escape the gravitational pull of a celestial body.
  • Escape velocity: The velocity required for an object to break free from the gravitational pull of a celestial body and enter orbit or leave the system entirely.
  • Event Horizon: The boundary around a black hole beyond which nothing can escape its gravitational pull.
  • Event Horizon: The boundary around a black hole beyond which nothing can escape.
  • Event horizon: The boundary surrounding a black hole beyond which nothing can escape the black hole’s gravity.
  • Event Horizon: The boundary surrounding a black hole beyond which nothing, including light, can escape its immense gravitational pull.
  • Exoplanet: A planet outside of our solar system
  • Exoplanet: A planet that orbits a star outside of our solar system.
  • Exoplanet: A planet that orbits a star outside of the Solar System.
  • Exosphere: The outermost layer of the Earth’s atmosphere, extending from about 600 km to several thousand km above the Earth’s surface, where the atmosphere becomes so thin that it merges with interplanetary space.
  • Extragalactic: Referring to objects or phenomena that exist outside of our galaxy, the Milky Way.
  • Extraterrestrial life: Life that may exist outside of the Earth.
  • Extraterrestrial life: The hypothetical existence of life forms that do not originate from Earth.
  • Extraterrestrial life: The possibility of life existing beyond Earth, including the search for signs of past or present life on other planets and moons.
  • Extraterrestrial: Any object or organism that originates outside of Earth.
  • Extraterrestrial: Anything originating outside of Earth, including life forms, objects, and phenomena.
  • Extravehicular activity (EVA): A spacewalk or other activity conducted outside of a spacecraft or other enclosed structure in space.
  • Extravehicular activity (EVA): A spacewalk or other activity outside of a spacecraft or space station, performed by an astronaut or other space-suited individual.
  • Extravehicular activity (EVA): A spacewalk or other activity that is conducted outside a spacecraft or space station, typically by an astronaut wearing a spacesuit.
  • Extravehicular activity (EVA): A spacewalk, also known as an extravehicular activity (EVA), is a type of activity done by an astronaut outside a spacecraft while in space.
  • Extravehicular activity (EVA): A spacewalk, or a period of time that an astronaut or cosmonaut spends outside of a spacecraft while wearing a spacesuit.
  • Extravehicular activity (EVA): A spacewalk, where an astronaut exits a spacecraft and performs tasks in the vacuum of space.
  • Extravehicular mobility unit (EMU): The spacesuit worn by an astronaut during EVA, providing life support and mobility in the vacuum of space.
  • Fermi Paradox: The apparent contradiction between the high likelihood of the existence of extraterrestrial civilizations and the lack of evidence for or contact with such civilizations.
  • Fuel Cell: A type of power source that converts chemical energy into electricity, typically used for long-duration missions.
  • Galaxy cluster: A group of galaxies that are held together by gravity and can contain hundreds to thousands of galaxies.
  • Galaxy: A collection of stars, dust, and gas bound together by gravity.
  • Galaxy: A collection of stars, planets, dust, and gas held together by gravity.
  • Galaxy: A large collection of stars, gas, and dust bound together by gravity.
  • Galaxy: A large collection of stars, gas, and dust held together by gravity.
  • Galaxy: A large collection of stars, gas, dust, and dark matter held together by gravity.
  • Gamma-ray burst: A highly energetic explosion that occurs in distant galaxies and releases a tremendous amount of energy, mostly in the form of gamma rays.
  • Gamma-ray burst: A highly luminous and brief flash of gamma rays that is thought to be caused by the collapse of a massive star or the merger of two neutron stars.
  • Geolocation in space: The process of determining the location of an object in space using techniques such as radar, optical tracking, or navigation systems.
  • Geolocation: The process of determining the location of an object or person on the Earth’s surface using techniques such as GPS, triangulation, or image analysis.
  • Geomagnetism: The study of the Earth’s magnetic field and its effects on the environment.
  • Geospace: The region of space that is affected by the Earth’s magnetic field and includes the ionosphere, magnetosphere, and the upper atmosphere.
  • Geostationary orbit: An orbit around the Earth at an altitude of approximately 36,000 kilometers where a satellite will appear to remain in the same location in the sky at all times.
  • Geostationary orbit: An orbit around the Earth that is at the same distance from the Earth as the Earth’s equator and in which an object will remain in the same location in the sky as observed from the Earth’s surface.
  • Geostationary orbit: An orbit at an altitude of approximately 36,000 kilometers above the Earth’s surface, in which a satellite will stay in a fixed position relative to the Earth.
  • Geostationary orbit: An orbit that is located at a distance of about 22,236 miles (35,786 kilometers) above the Earth’s equator, in which a satellite will remain over the same spot on the Earth’s surface.
  • Geosynchronous orbit: An orbit around the Earth or other celestial body that has the same period of rotation as the body, allowing a satellite to remain in a fixed position relative to the surface.
  • GPS: Global Positioning System, a network of satellites and ground stations that provide precise location and time information for navigation and other purposes.
  • Gravitational lens: A massive object (such as a galaxy) that bends and magnifies the light of more distant objects behind it, allowing for the study of distant and faint objects.
  • Gravitational lensing: The bending of light by massive objects, such as galaxy clusters, which can magnify, distort, or create multiple images of distant sources.
  • Gravitational lensing: The phenomenon where the gravity of a massive object, such as a galaxy or a black hole, bends and magnifies the light of more distant objects behind it.
  • Gravitational Waves: Ripples in space-time caused by the acceleration of massive objects, such as merging black holes.
  • Gravitational waves: Ripples in the fabric of spacetime caused by massive, accelerating objects, such as merging black holes.
  • Gravity assist: A technique used by spacecraft to gain energy and change direction by using the gravity of a planet or other celestial body.
  • Ground segment: the ground-based control and communication systems that support the operation of a spacecraft or space mission.
  • Ground station: A facility on the Earth’s surface that communicates with and controls a spacecraft.
  • Guidance, navigation, and control : The system that helps a spacecraft to navigate in space and maintain its trajectory.
  • Habitable zone: The region around a star where temperatures are suitable for liquid water to exist on the surface of a planet, making it potentially habitable for life as we know it.
  • Habitat Module: A type of spacecraft module designed to provide a living space for humans in space.
  • Habitat: A living space or structure designed for human habitation in a space environment, such as the International Space Station.
  • Heat shield: A layer or coating applied to a spacecraft to protect it from the heat generated by atmospheric reentry.
  • Heat shield: A protective device or material used to protect a spacecraft or other object from the heat generated during reentry into the atmosphere.
  • Heliocentric orbit: An orbit around the sun.
  • Heliophysics: The study of the Sun and its effects on the solar system, including solar flares, coronal mass ejections, and the solar wind.
  • High altitude balloon: A type of balloon that is flown at high altitudes, often for scientific or research purposes.
  • High altitude platform: A type of platform that is flown at high altitudes, such as a high altitude balloon or airship, often used for telecommunications or other purposes.
  • High Earth orbit (HEO): An orbit around the Earth at an altitude greater than 20,000 kilometers.
  • High Earth orbit (HEO): An orbit at an altitude of more than 2,000 km above the Earth’s surface, typically used for telecommunications, navigation, and other applications.
  • High Earth orbit: An orbit around the Earth at an altitude above 2000 km.
  • High Earth orbit: An orbit at an altitude above 35,786km above the Earth’s surface, it is used for deep space exploration and studying the outer space environment.
  • High-altitude balloon: A type of balloon that can reach high altitudes, above 100,000 feet, and can be used for scientific research, atmospheric and environmental monitoring, and technology testing.
  • Human spaceflight: The use of spacecraft to transport humans beyond the Earth’s atmosphere and into space, for the purpose of research, exploration, and commerce.
  • Human-robot interaction (HRI): The study of how humans and robots interact and communicate with each other.
  • Hypersonic: Refers to velocities greater than five times the speed of sound, often used in the context of reentry vehicles and atmospheric flight.
  • Hyperspace: A theoretical concept of a higher-dimensional space that could be used for faster-than-light travel.
  • Inclination: The angle between an object’s orbit and the reference plane, such as the Earth’s equator.
  • Inclination: The angle between the orbital plane of a celestial body and the reference plane (such as the equatorial plane of the primary body).
  • Inclined orbit: An orbit in which the satellite’s plane of orbit is tilted with respect to the Earth’s equatorial plane.
  • Inertial guidance system: A navigation system that uses accelerometers and gyroscopes to measure the velocity and orientation of a spacecraft, allowing it to determine its position in space.
  • Inflation: A brief period of extremely rapid expansion that occurred a fraction of a second after the Big Bang.
  • In-orbit servicing: The maintenance, repair, and upgrade of a spacecraft while it is in orbit.
  • In-orbit servicing: The maintenance, repair, or upgrading of a spacecraft or other object in orbit around a celestial body, typically performed by a robotic spacecraft or other specialized vehicle.
  • In-orbit servicing: The practice of repairing, upgrading, or refueling a satellite while it is in orbit, typically by sending a spacecraft or robot to rendezvous with the satellite.
  • In-situ resource utilization (ISRU): The use of local resources, such as water or soil, to support human activities in space.
  • In-situ resource utilization (ISRU): The use of resources found on a celestial body, such as water or regolith, to support human exploration and colonization.
  • Intergalactic: Referring to objects or phenomena that exist between galaxies.
  • International cooperation in the exploration and use of outer space: A principle under the Outer Space Treaty that encourages countries to work together in the peaceful exploration and use of outer space for the benefit of all mankind.
  • International Space Station (ISS): A habitable artificial satellite in low Earth orbit, used as a research laboratory and as a
  • Interplanetary mission: A space mission that travels beyond the Earth’s orbit to explore other planets, moons or other celestial bodies in the solar system.
  • Interplanetary mission: A space mission that travels to or beyond the planets in our solar system, such as a mission to Mars or a comet.
  • Interplanetary travel: The journey of a spacecraft from one planet to another within the solar system.
  • Interplanetary travel: The travel of spacecraft between planets within a solar system.
  • Interstellar medium: The matter and radiation that exists between stars in a galaxy.
  • Interstellar Medium: The matter and radiation that exists in the space between stars in a galaxy.
  • Interstellar mission: A space mission that travels to other stars or galaxies.
  • Interstellar travel: The hypothetical travel to other star systems beyond our own solar system.
  • Interstellar travel: The journey of a spacecraft from one star system to another.
  • Interstellar travel: The travel of spacecraft between stars.
  • Ion Thrusters: A type of rocket engine that uses ionized particles as propellant, which can provide very high specific impulse but low thrust.
  • Ionizing radiation: Radiation that can remove tightly bound electrons from atoms, creating ions and potentially damaging living tissue.
  • Ionosphere: The layer of the Earth’s atmosphere that is ionized by solar radiation and extends from about 50 to 600 km above the Earth’s surface.
  • Irregular galaxy: A type of galaxy that does not fit into either the spiral or elliptical classification.
  • Kepler point: The point in the orbit of a celestial body where the gravitational attraction of two large bodies is in equilibrium.
  • Kepler state: The state in which the gravitational forces acting on a celestial body are in equilibrium, allowing for stable orbits.
  • Kepler transfer: A method of changing the orbit of a spacecraft by using the gravitational pull of one celestial body to change the velocity of the spacecraft, allowing it to reach a different orbit or celestial body.
  • Kepler’s laws of planetary motion : Three laws that describe the motion of planets in their orbits around the Sun, formulated by German astronomer Johannes Kepler in the 17th century. -Spacecraft: A vehicle, machine or device designed to fly in outer space and function in the space environment
  • Kepler’s laws of planetary motion: Three laws that describe the motion of planets and other objects in orbit around a central body, formulated by Johannes Kepler in the 17th century.
  • Landing: The process of a spacecraft or other object returning to the Earth’s surface after a journey in space.
  • Launch vehicle: A rocket or other vehicle used to launch a spacecraft into space.
  • Liability for damage caused by space objects: A principle under the Outer Space Treaty that holds countries liable for damage caused by space objects they have launched.
  • LIDAR: A remote sensing method that uses laser light to measure distances and create 3D models of the environment.
  • Life support system: A system that provides the necessary conditions for human survival in space, such as air, water, temperature control, and waste management.
  • Light Pollution: The excessive amount of artificial light in the night sky that makes it difficult to observe stars and other celestial objects.
  • Light-year: A unit of distance used to express interstellar distances, equal to the distance that light travels in one year, approximately 9.46 trillion kilometers.
  • Light-year: The distance light travels in one year, which is about 5.88 trillion miles (9.46 trillion kilometers).
  • Liquid Rocket Engine: A type of rocket engine that uses liquid propellants, such as liquid hydrogen and liquid oxygen.
  • Low Earth orbit (LEO): An orbit around the Earth at an altitude of approximately 160 to 2,000 kilometers.
  • Low Earth orbit (LEO): An orbit at an altitude of up to about 2,000 km above the Earth’s surface, typically used for Earth observation, weather forecasting, and other applications.
  • Low Earth orbit: An orbit around the Earth at an altitude of between 160-2000 km.
  • Low Earth orbit: An orbit at an altitude of up to 2000km above the Earth’s surface, it is commonly used for Earth observation, telecommunications, and weather forecasting.
  • Low Earth orbit: An orbit at an altitude of up to about 1,200 miles (2,000 kilometers) above the Earth’s surface, in which many satellites and the International Space Station are located.
  • Lunar lander: A spacecraft designed to land on the surface of the Moon and return to orbit, such as the Apollo Lunar Module.
  • Lunar mining: The extraction of valuable resources, such as minerals or water, from the Moon.
  • Lunar tourism refers to the concept of providing space travel experiences to paying customers that involve trips to the Moon. It is still in the early stages of development and currently, there are no operational lunar tourism missions. However, multiple private companies have announced plans to develop lunar tourism in the future, but it’s still in a speculative stage and depends on technological and financial feasibility.
  • Lunar tourism:
  • Machine learning in space: The use of machine learning techniques, such as neural networks, to analyze and understand data from space-related activities, such as satellite imagery and remote sensing.
  • Machine learning: A subfield of AI that involves the use of algorithms and statistical models to enable a machine to improve its performance with experience.
  • Magnetosphere: The region around a planet or other celestial body where its magnetic field is dominant and can protect it from the solar wind.
  • Main sequence star: A type of star that generates energy through nuclear fusion in its core, characterized by its position on the main sequence of the Hertzsprung-Russell diagram.
  • Mars mining: The extraction of valuable resources, such as minerals or water, from Mars.
  • Mars rover: A type of robotic vehicle designed to explore the surface of Mars, such as the NASA’s Perseverance and Curiosity rovers.
  • Medium Earth orbit (MEO): An orbit around the Earth at an altitude of approximately 8,000 to 20,000 kilometers.
  • Medium Earth orbit: An orbit at an altitude between 2,000 km and 35,786 km above the Earth’s surface, it is used for navigation, weather forecasting, and imaging.
  • Mesosphere: The layer of the Earth’s atmosphere that extends from about 50 km to 85 km above the Earth’s surface and is characterized by decreasing temperatures with altitude.
  • Meteor: A small, fleeting piece of space debris that burns up as it enters the Earth’s atmosphere.
  • Meteorite: A meteor that survives its passage through the Earth’s atmosphere and lands on the surface.
  • Microgravity: The condition of near weightlessness experienced by objects in orbit around the Earth or another celestial body.
  • Microgravity: The condition of very weak gravity experienced by objects in orbit around a celestial body.
  • Microgravity: The condition of very weak gravity or near weightlessness, such as that experienced by objects in orbit around a celestial body.
  • Microgravity: The condition of very weak gravity, such as that experienced by objects in orbit around a celestial body.
  • Microgravity: The near-absence of gravity experienced in orbit, characterized by weightlessness and freefall.
  • Milky Way: The galaxy that contains our solar system.
  • Mission control: A facility responsible for the management and control of a space mission or satellite.
  • Moon Agreement: An international treaty that sets out the principles for the use and exploration of the Moon and other celestial bodies, including the prohibition of military activities and the requirement that resources be used for peaceful purposes.
  • Multiverse: A concept in which our universe is just one of many universes that make up a larger multiverse.
  • Multiverse: The hypothetical existence of multiple universes, including our own, beyond the observable universe.
  • Natural language processing (NLP) in space: The application of NLP techniques, such as language understanding and generation, in space-related activities, such as human-robot communication and space situational awareness.
  • Natural language processing (NLP): The ability of a computer to understand and generate human language.
  • Navigation satellite: A type of satellite used for determining the position and velocity of a receiver on Earth or in space, such as GPS satellites.
  • Neutron Star: A small, incredibly dense star that is composed mostly of neutrons and is formed from the collapsed core of a larger star.
  • Neutron star: A type of star that forms from the collapsed core of a supernova, characterized by its incredibly high density and strong magnetic field.
  • Neutron Star: A type of star that is formed from the collapsed core of a massive star after a supernova explosion. Neutron stars are extremely dense and have a radius of about 10 km and a mass of about 1.4 times that of the sun.
  • Neutron star: A type of star that is formed from the collapsed core of a supergiant star. Neutron stars are incredibly dense and have a very strong gravitational pull.
  • Neutron Star: The extremely dense, incredibly small remains of a star that has gone supernova and collapsed under gravity.
  • Note that this is a comprehensive list of space-related terminology and their definitions, however, there could be more specific terms and definitions within each field that are not mentioned here.
  • Note: This is not an exhaustive list, and there are many more terms and definitions related to space and astronomy.
  • Nuclear Power: A type of power source that generates electricity using nuclear reactions, typically used for deep space missions.
  • Nuclear Propulsion: A type of rocket engine that uses nuclear energy to heat a fluid and create thrust.
  • Orbital debris: Man-made objects in orbit around a celestial body that are no longer functional or needed.
  • Orbital decay: The gradual decrease in altitude of a satellite in orbit due to drag from the upper atmosphere.
  • Orbital decay: The gradual decrease in altitude of a spacecraft or other object in orbit around a celestial body, caused by the drag of the upper atmosphere or other factors.
  • Orbital decay: The gradual descent of a spacecraft or other object in orbit due to atmospheric drag or other factors, causing it to re-enter the atmosphere or crash on a celestial body surface.
  • Orbital decay: The gradual lowering of a spacecraft’s orbit due to drag from the upper atmosphere, or due to the loss of propulsion capability.
  • Orbital flight: A type of spaceflight that reaches orbit and stays in space for a period of time.
  • Orbital insertion: The maneuver of a spacecraft or other object to achieve a stable orbit around a celestial body.
  • Orbital insertion: The process of a spacecraft entering into orbit around a celestial body.
  • Orbital launch: The process of launching a spacecraft or other object into orbit around a celestial body.
  • Orbital mechanics: The branch of astronautics that deals with the motion of spacecraft in orbits around celestial bodies, including the calculation of trajectories, orbits, and rendezvous.
  • Orbital mechanics: The branch of celestial mechanics that deals with the motion of artificial satellites and other objects in orbit around a celestial body.
  • Orbital mechanics: The branch of mechanics that deals with the motion of objects in orbit around a celestial body, including the calculation of orbits and the forces that affect them.
  • Orbital mechanics: The study of the motion of objects in orbit and the forces that affect them, including gravity, atmospheric drag, and propulsion.
  • Orbital mechanics: The study of the motion of objects in space, particularly the behavior of satellites and other objects in orbit around celestial bodies.
  • Orbital mechanics: the study of the motion of objects in space, such as spacecraft and satellites, and the forces that affect them, such as gravity and propulsion.
  • Orbital period: The time it takes for a celestial body to make one complete orbit around another body.
  • Orbital rendezvous: The process of two spacecraft meeting up in orbit around a celestial body.
  • Outer Space Treaty: An international treaty that sets out the basic principles for the use and exploration of outer space, including the prohibition of nuclear weapons and other weapons of mass destruction in space.
  • Parabolic flight: A type of aircraft flight that follows a parabolic path, allowing for brief periods of weightlessness and microgravity.
  • Parachute: A device used to slow the descent of a spacecraft or a person during landing or emergency evacuation.
  • Parachute: A device used to slow the descent of a spacecraft or other object during landing or reentry.
  • Payload: A cargo or equipment that is carried by a spacecraft, rocket, or other launch vehicle.
  • Payload: The equipment or cargo carried by a spacecraft for a specific mission, such as a telescope or a lander.
  • Payload: The equipment or cargo that is carried by a spacecraft or launch vehicle on a mission.
  • Payload: The equipment or cargo that is carried by a spacecraft or launch vehicle.
  • Perigee: The point in an object’s orbit that is closest to the body it is orbiting.
  • Perigee: The point in an object’s orbit where it is closest to the Earth.
  • Perigee: The point in an orbit closest to the celestial body being orbited.
  • Perigee: The point in an orbit when a celestial body is closest to the body it is orbiting.
  • Photon: A particle of light, which is a form of electromagnetic radiation.
  • Planet: A celestial body that orbits a star and is not a star or a satellite (moon).
  • Planetary science: The study of the solar system and its planets, including their geology, atmosphere, and potential for life.
  • Polar orbit: An orbit around the Earth that passes over the Earth’s poles.
  • Polar orbit: An orbit around the Earth that passes over the poles.
  • Polar orbit: An orbit in which a satellite passes over both poles of the Earth.
  • Propellant: A substance used to provide propulsive force in a rocket or spacecraft.
  • Propellant: A substance used to provide thrust for a spacecraft or other propulsion systems, such as rocket fuel or ionized particles.
  • Propellant: The fuel and oxidizer used in a rocket engine to produce thrust.
  • Propellant: The fuel and oxidizer used to power a rocket engine
  • Propulsion: The system or method used to provide thrust or power for a spacecraft or launch vehicles, such as chemical rocket engines, solar sails, or ion thrusters.
  • Protostar: A stage in the formation of a star, characterized by the contraction of a cloud of gas and dust.
  • Pulsar: A neutron star that emits beams of radiation that are observed as pulses of light.
  • Pulsar: A rapidly spinning neutron star that emits beams of radiation.
  • Pulsar: A type of neutron star that emits intense beams of radiation in regular pulses.
  • Pulsar: A type of neutron star that emits regular pulses of radiation, often in the form of radio waves.
  • Pulsar: A type of neutron star that emits regular pulses of radiation.
  • Quantum entanglement: A phenomenon where the properties of two or more particles become correlated, meaning that the state of one particle affects the state of another, even when separated by a large distance.
  • Quasar: A bright, distant object that is thought to be powered by a supermassive black hole at the center of a galaxy.
  • Quasar: A highly luminous active galactic nucleus powered by a supermassive black hole.
  • Quasar: A type of active galaxy that is among the most distant and most luminous objects in the universe.
  • Quasar: An extremely luminous active galactic nucleus powered by a supermassive black hole.
  • Quasar: An extremely luminous active galactic nucleus, powered by a supermassive black hole at the center of a galaxy.
  • Radarsat: A type of satellite that uses radar to capture images of the Earth’s surface, even through cloud cover.
  • Radiation shielding: The use of materials or techniques to protect humans and equipment from space radiation, such as using water or other dense materials.
  • Radioisotope thermoelectric generator (RTG): A type of power source that generates electricity from the decay of radioactive isotopes, typically used for deep space missions.
  • Red giant: A type of star that has exhausted the nuclear fuel in its core and expanded in size, characterized by its reddish color.
  • Redshift: The phenomenon where light from a distant object is shifted towards longer, red wavelengths due to the expansion of the universe.
  • Redshift: The phenomenon where light from an object moving away from an observer is shifted towards longer (red) wavelengths.
  • Redshift: The shift of an object’s spectral lines toward longer wavelengths (red) caused by its motion away from the observer.
  • Redshift: The shift of an object’s spectral lines towards longer wavelengths (the red end of the spectrum) caused by the object moving away from the observer.
  • Reentry vehicle: A spacecraft or other object that is designed to survive the heat and stress of reentry into the atmosphere and safely land on a celestial body.
  • Reentry: The process of a spacecraft or other object returning to the atmosphere of a celestial body after being in space.
  • Reentry: The process of a spacecraft or other object returning to the Earth’s atmosphere after a journey in space.
  • Re-entry: The process of a spacecraft returning to Earth’s atmosphere from space.
  • Registration of objects launched into outer space: A requirement under the Outer Space Treaty states that countries launching objects into outer space must provide information about their objects to the United Nations.
  • Remote sensing: The use of instruments and technology to gather data about the Earth and other celestial bodies from a distance.
  • Remote sensing: The use of instruments, such as cameras and sensors, to gather information about the Earth and other celestial bodies from a distance.
  • Rescue and return of astronauts: A principle under the Outer Space Treaty that holds countries responsible for rescuing and returning astronauts in distress.
  • Retrograde motion: The apparent backwards motion of a planet or other object in orbit, as observed from the perspective of a observer on a more interior orbit.
  • Retrograde orbit: An orbit around a celestial body in the opposite direction of its rotation.
  • Retrograde orbit: An orbit in which a satellite moves in the opposite direction to the rotation of the body it is orbiting.
  • Retropropulsion: The use of propulsion systems to slow or stop the descent of a spacecraft or other object during landing or reentry.
  • Reusable launch vehicle (RLV): A type of launch vehicle that is designed to be used multiple times, reducing the cost of space launches.
  • Robotic spacecraft: A spacecraft that is operated remotely or autonomously, without the presence of human operators.
  • Robotics in space: The use of robots and autonomous systems in space-related activities, such as satellite servicing, planetary exploration, and space debris removal.
  • Robotics: The branch of technology that deals with the design, construction, and operation of robots.
  • Rocket engine: A device that produces thrust by the expulsion of a gas or fluid.
  • Rocket stage: A section of a rocket that is designed to separate and fall away once its fuel is depleted.
  • Rocket: A vehicle or machine that propels itself into the air or space using thrust.
  • Rocket: A vehicle, missile, or aircraft propelled by one or more engines that generate thrust by the expulsion of gas or by the reaction to the ejection of some other substance.
  • Rogue planet: A planet that is not gravitationally bound to a star, but instead wanders through interstellar space.
  • Satellite imagery: The use of satellites to capture images of the Earth’s surface.
  • Satellite: A celestial body that orbits a planet or other celestial body.
  • Satellite: An artificial object that is placed in orbit around the Earth or another celestial body, used for communication, navigation, or scientific research.
  • SETI (Search for Extraterrestrial Intelligence): The search for signs of intelligent life beyond Earth, including the use of radio telescopes to listen for signals from other civilizations.
  • SETI: The Search for Extraterrestrial Intelligence, which involves using telescopes and other instruments to search for radio signals or other signs of intelligent life in the universe.
  • Shielding: The use of materials, such as aluminum or lead, to protect against ionizing radiation.
  • Singularity: A point in space-time where the laws of physics as we know them break down and the density of matter becomes infinite.
  • Singularity: A point in space-time where the laws of physics as we know them break down and the density of matter is infinite.
  • Singularity: A point or region in space-time at which gravitational forces cause matter to have an infinite density and infinite gravity.
  • Singularity: A point or region in space-time at which the laws of physics as we know them break down and no longer apply.
  • Solar energetic particles: High-energy particles emitted by the Sun during solar flares and coronal mass ejections, which can be dangerous for astronauts and satellites.
  • Solar Power: A type of power source that converts sunlight into electricity using solar cells.
  • Solar sail: A proposed method of propulsion that would use the pressure of sunlight to propel a spacecraft through space.
  • Solar sail: A spacecraft propulsion method that uses the pressure of sunlight to push a large, reflective sail, allowing the spacecraft to travel through space without the use of traditional propulsion methods.
  • Solar Sailing: A method of propulsion that uses the pressure of sunlight to push a large, reflective sail.
  • Solar system: The collection of celestial bodies that orbit around the Sun, including the eight planets, their moons, and other smaller bodies such as asteroids and comets.
  • Solar System: The planetary system that includes the Sun and the objects that orbit it, such as planets, moons, and asteroids.
  • Solar wind: A stream of charged particles emitted by the Sun that can affect the Earth’s magnetic field and cause auroras.
  • Solar wind: A stream of charged particles, primarily electrons and protons, that flow out from the Sun in all directions.
  • Solid Rocket Motor: A type of rocket engine that uses solid propellants, which are typically made of a mixture of fuel and an oxidizer.
  • Space adaptation syndrome (SAS): The physiological changes that occur in the human body as a result of adapting to microgravity.
  • Space agriculture: The cultivation of plants in space, such as on a space station or lunar base, to provide food and oxygen for human explorers and settlers.
  • Space archaeology: The study of human activities and artifacts in space, such as satellite debris and abandoned spacecraft, as well as the study of ancient artifacts on celestial bodies, such as the Moon and Mars.
  • Space architecture: The design and construction of structures for human habitation and activity in space, such as space habitats and lunar bases.
  • Space debris mitigation guidelines: The set of guidelines and recommendations issued by the international community to reduce the amount of debris created by human activities in space.
  • Space debris mitigation: The measures taken to reduce the amount of debris in space and minimize the potential for collisions, such as guidelines for the design of spacecraft, the use of trajectory control systems, and the tracking and removal of debris.
  • Space debris mitigation: The measures taken to reduce the amount of debris in space and to minimize the risk of collisions with active satellites and spacecraft.
  • Space debris mitigation: The practice of minimizing the amount of debris created by human activities in space, such as by designing spacecraft to be more easily decommissioned or by using propulsion systems that do not leave behind debris.
  • Space debris mitigation: The practice of reducing the amount of space debris by removing or deorbiting inactive spacecraft and limiting the creation of new debris.
  • Space debris modeling: The use of computer simulations and mathematical models to predict the movements and behavior of debris in orbit, including its potential to collide with other objects.
  • Space debris monitoring: The tracking and observation of debris in orbit to monitor its movements and predict potential collisions.
  • Space debris removal: The process of removing debris from orbit around Earth, either by deorbiting it, or by pushing it out of the way using a spacecraft or other device.
  • Space debris removal: The process of removing debris from orbit to prevent collisions and ensure the safe use of space.
  • Space debris removal: The use of technology or techniques to remove or deactivate space debris, such as using a net or a harpoon to capture debris or using a laser to deorbit it.
  • Space debris: Any man-made object in orbit around a celestial body that no longer serves a useful purpose, including defunct satellites and rocket stages.
  • Space debris: Man-made objects in Earth orbit that no longer serve a useful purpose and can potentially collide with functioning spacecraft.
  • Space debris: Man-made objects in Earth orbit that no longer serve a useful purpose.
  • Space debris: Man-made objects in orbit around the Earth that no longer serve a useful purpose, such as old satellites, rocket stages, and fragments from collisions and explosions.
  • Space debris: The accumulation of defunct human-made objects in space, including old satellites, rocket stages, and other debris.
  • Space debris: The man-made objects that are left in space after a mission is complete, such as old rocket stages, defunct satellites, and other debris. These objects can pose a danger to operational spacecraft and can contribute to the accumulation of debris in space.
  • Space debris: The man-made objects, such as old satellites, rocket stages, and debris from collisions or explosions, that orbit the Earth and can pose a hazard to active spacecraft.
  • Space elevator: A hypothetical structure that would extend from the surface of a planet or other celestial body to an anchor point in space, such as a geostationary satellite, providing a method of transportation between the surface and space.
  • Space elevator: A proposed infrastructure that would use a cable anchored to the Earth’s surface and extending into space, allowing for the transportation of people and materials to and from orbit without the use of rockets.
  • Space elevator: A proposed type of transportation system that would use a cable anchored to a celestial body and extending into space to lift payloads into orbit.
  • Space elevator: A theoretical structure that would extend from the surface of a celestial body, such as Earth or a planet, into space, allowing for the transportation of people and materials into space without the use of rockets.
  • Space environment: The physical conditions and phenomena that exist in space, such as the vacuum, radiation, and micrometeoroids.
  • Space exploration: The study and investigation of outer space and the celestial bodies within it, typically carried out by spacecraft and other robotic missions.
  • Space exploration: The study and investigation of outer space using spacecraft and other technology.
  • Space exploration: The study and investigation of the universe beyond the Earth’s atmosphere, using spacecraft, satellites, and other means.
  • Space exploration: The study and observation of the universe beyond Earth, including the search for new celestial bodies, the study of the origins and nature of the universe, and the search for extraterrestrial life.
  • Space exploration: The study of celestial bodies and the universe beyond the Earth’s atmosphere, including the use of spacecraft and other technologies.
  • Space force: A military branch or service that specializes in space-related operations and activities, such as satellite launches, space surveillance and space security.
  • Space fountain: A hypothetical structure that would extend from the surface of a planet or other celestial body to an anchor point in space using a beam of charged particles to levitate objects and provide a method of transportation.
  • Space habitat: A habitable structure designed for use in space, such as a space station or moon base.
  • Space habitat: A type of spacecraft or other structure that provides a living space for humans in space, such as a space station or lunar base.
  • Space hotels: A type of space station or spacecraft designed to provide accommodation and other services to space tourists.
  • Space launch system (SLS): A type of launch vehicle that is designed to carry humans and cargo to destinations beyond low Earth orbit, such as the Moon and Mars.
  • Space launch system (SLS): An advanced launch vehicle being developed by NASA, designed to support future human exploration of the solar system.
  • Space launch system: A rocket and spacecraft combination that is used to launch payloads and astronauts into space. Examples include NASA’s Space Launch System and SpaceX’s Falcon Heavy.
  • Space law: The body of law that governs activities in outer space, including the use of resources, the rights of countries, and the protection of the environment.
  • Space law: The body of law that governs the activities of human beings in outer space.
  • Space manufacturing: The production of goods and materials in space, such as using 3D printing technology or other advanced manufacturing techniques.
  • Space manufacturing: The use of resources and materials from space to create products, such as solar panels, fuels and other materials.
  • Space manufacturing: The use of resources, such as materials and energy, from space to manufacture products, such as solar panels and communication satellites.
  • Space manufacturing: The use of space-based resources and facilities to produce goods and materials for use on Earth or in space.
  • Space medicine: The branch of medicine that deals with the health and well-being of people in space, including the effects of microgravity, radiation, and isolation on the human body.
  • Space medicine: The branch of medicine that deals with the medical issues and challenges associated with human spaceflight and long-duration space missions.
  • Space medicine: The study of the effects of spaceflight on the human body and the platform for international cooperation in space exploration and scientific research.
  • Space medicine: The study of the medical aspects of space travel and living in space, including the effects of microgravity, radiation, and isolation on the human body.
  • Space medicine: The study of the physiological and psychological effects of spaceflight on the human body, as well as the development of medical techniques and technologies to support human spaceflight.
  • Space mining: The extraction of valuable materials from celestial bodies, such as the Moon and Mars.
  • Space mining: The extraction of valuable resources, such as minerals or water, from celestial bodies such as the Moon, asteroids or Mars.
  • Space observatory: A type of space telescope or satellite used for astronomical observations, such as the Hubble Space Telescope or the Chandra X-ray Observatory.
  • Space policy: The policies and regulations set forth by governments and other organizations to govern activities in space, such as the use of satellites, the launch of spacecraft, and the exploration of other celestial bodies.
  • Space policy: The principles and regulations that govern the use and exploration of space by a country or organization.
  • Space policy: The set of laws, regulations, and guidelines that govern human activities in space.
  • Space pollution: The accumulation of man-made debris in space, which can pose a hazard to spacecraft and active satellites.
  • Space probe: A type of spacecraft sent to explore other celestial bodies, such as the Moon, Mars, or the outer planets of the solar system.
  • Space radiation: The ionizing radiation present in space, such as cosmic rays and solar particles, which can be harmful to humans and electronics.
  • Space radiation: The ionizing radiation present in the space environment, including galactic cosmic rays and solar energetic particles.
  • Space science: The branch of science that studies the physical and natural phenomena in space, including astronomy, astrobiology, and planetary science.
  • Space security: The protection of space assets and activities from interference, disruption, or attack.
  • Space settlement: The establishment of permanent human communities on celestial bodies, such as the Moon or Mars.
  • Space Shuttle: A reusable spacecraft system operated by NASA from 1981 to 2011, used for transportation of cargo and crew to and from low Earth orbit, as well as for servicing and repair of satellites in orbit.
  • Space Shuttle: A reusable spacecraft system that was operated by NASA from 1981 to 2011, designed for launching, orbiting, and landing.
  • Space situational awareness (SSA): The knowledge and understanding of the space environment, including the location and movements of objects in space, in order to ensure the safety and security of space activities.
  • Space situational awareness: The ability to detect, track, and identify objects in space, including active and inactive satellites, debris, and other objects, in order to assess potential threats and opportunities.
  • Space situational awareness: The knowledge and understanding of the location, movement, and characteristics of objects in space, such as active and inactive satellites, space debris, and natural objects, for the purpose of collision avoidance and safe space operations.
  • Space Station: A habitable artificial satellite that orbits the Earth or other celestial body.
  • Space station: A type of spacecraft designed to support human habitation and activities in orbit around the Earth or another celestial body.
  • Space station: An artificial structure placed in orbit around the Earth or another celestial body, designed for humans to live and work in for extended periods of time.
  • Space suit: A suit worn by an astronaut during EVA to provide life support and protection from the vacuum and temperature extremes of space.
  • Space Suit: A suit worn by astronaut during spacewalk to provide them with life support and protection against the vacuum and extreme temperatures of space.
  • Space surveillance: The detection, tracking, and identification of objects in space, including satellites and debris.
  • Space telescope: A telescope placed in orbit around the Earth or another celestial body, designed for observing the universe from outside the Earth’s atmosphere.
  • Space telescope: A telescope that is placed in orbit around the Earth or another celestial body, designed for observing the universe from outside the Earth’s atmosphere.
  • Space telescope: A type of telescope placed in orbit around the Earth or another celestial body, used for observing the universe at wavelengths that are blocked by the Earth’s atmosphere.
  • Space tether: A cable or other structure that connects two or more spacecraft or other objects in space, allowing them to transfer momentum and energy or to remain in a stable configuration.
  • Space tourism: The business of providing space travel experiences to paying customers, typically through suborbital flights or trips to space stations.
  • Space tourism: The business of providing space travel experiences, such as suborbital flights or space station visits, to paying customers.
  • Space tourism: The commercial business of providing space travel experiences to paying customers.
  • Space tourism: The commercial use of space travel for recreational or other non-scientific purposes.
  • Space tourism: The commercial use of spaceflight to transport paying customers into space for the purpose of space tourism or recreation.
  • Space traffic management: The coordination and regulation of the use of space to ensure the safety and efficiency of space activities, such as preventing collisions and managing the launch and reentry of spacecraft.
  • Space traffic management: The coordination of the movement and activities of spacecraft in order to prevent collisions and ensure the safe and efficient use of space.
  • Space traffic management: The process of monitoring, controlling, and regulating the movement of spacecraft in order to prevent collisions and ensure safe and efficient use of space.
  • Space travel agencies: A company that provides space travel and space tourism services.
  • Space weather effects on technology: The impact of space weather on satellite and communication systems, power grids, and navigation systems.
  • Space weather effects on the human body: The impact of space weather on the human body, including the potential for increased radiation exposure and the risk of acute radiation sickness.
  • Space weather forecasting: The prediction of space weather conditions, including solar flares, coronal mass ejections, and geomagnetic storms, and their potential effects on satellite and communication systems, power grids, and navigation systems.
  • Space weather mitigation: The implementation of measures to minimize the impact of space weather on human activities and infrastructure, such as shutting down power grids, diverting aircraft routes, and protecting satellites from radiation.
  • Space weather monitoring: The continuous observation of space weather conditions using satellites, ground-based instruments, and other means.
  • Space weather: The conditions and phenomena in the space environment that can affect the operation of spacecraft and other technology in space, such as solar flares and geomagnetic storms.
  • Space weather: The conditions in space that can affect the Earth’s environment, such as solar flares and coronal mass ejections.
  • Space weather: The conditions in space that can affect the performance and reliability of space-borne and ground-based technological systems and can endanger human life or health.
  • Space weather: The conditions in space, such as solar flares and coronal mass ejections, that can affect the performance and safety of spacecraft and communications systems.
  • Space weather: The various conditions in space that can affect the Earth’s environment and technology, such as solar flares, coronal mass ejections, and geomagnetic storms.
  • Space-based gravitational wave detector: A concept of using a network of spacecraft or other objects in space to detect the ripples in spacetime known as gravitational waves, which were predicted by Albert Einstein’s theory of general relativity.
  • Space-based interferometry: The use of multiple spacecraft or other objects in space to work together as a single telescope or observatory, allowing for very high resolution or other advanced capabilities.
  • Space-based observatory: A collection of telescopes or other instruments placed in orbit around the Earth or on another celestial body to observe the universe.
  • Space-based observatory: A telescope or other instrument that is placed in orbit around a celestial body to observe the cosmos from space.
  • Space-based solar power: A proposed method of harnessing solar energy by collecting it in space and transmitting it to Earth via microwave or laser beams.
  • Space-based solar power: The concept of using spacecraft or other structures in space to collect and transmit solar energy to the Earth.
  • Space-based telescope: A telescope placed in orbit around the Earth, such as the Hubble Space Telescope, that is able to observe the universe with minimal interference from the Earth’s atmosphere.
  • Space-based telescope: A telescope that is placed in orbit around the Earth or on another celestial body to observe the universe.
  • Spacecraft attitude control: The methods and systems used to control the orientation or position of a spacecraft in space.
  • Spacecraft propulsion: The methods and systems used to provide thrust or propulsion for a spacecraft, such as chemical rockets, electric propulsion, and solar sails.
  • Spaceplane: A type of spacecraft that can function as both an aircraft and a spacecraft, capable of taking off and landing horizontally like an airplane and reaching orbit.
  • Spaceplane: A type of spacecraft that can function both as an aircraft and as a spacecraft, capable of taking off and landing horizontally like an airplane and reaching orbit.
  • Spacesuit: A suit worn by an astronaut or cosmonaut that provides life support and protection from the harsh environment of space.
  • Specific impulse: A measure of the efficiency of a rocket engine, calculated as the thrust per unit of propellant flow.
  • Spectral Lines: The lines of different colors that appear in the spectrum of an object, caused by the absorption or emission of light by atoms or molecules in the object.
  • Spectroscopy: The study of the interaction of matter and electromagnetic radiation, which can be used to identify and study the properties of materials.
  • Spiral galaxy: A type of galaxy characterized by its spiral arms and disk-like shape.
  • Spy satellite: A type of satellite used for reconnaissance and surveillance, often by military or intelligence agencies.
  • Standard Model of Cosmology: A theoretical framework that describes the properties and behavior of the universe on the largest scales.
  • Star Cluster: A group of stars that are gravitationally bound and were formed from the same cloud of gas and dust.
  • Star Cluster: A group of stars that are gravitationally bound and formed from the same molecular cloud.
  • Star Formation: The process by which dense regions within molecular clouds collapse and form stars.
  • Star: A luminous sphere of gas that generates energy through nuclear fusion.
  • Star: A luminous, gaseous sphere of plasma held together by gravity.
  • Stratosphere: The layer of the Earth’s atmosphere above the troposphere, extending from about 10 km to 50 km above the Earth’s surface.
  • Suborbital flight: A type of spaceflight that reaches space but does not achieve orbit, and typically lasts a few minutes of weightlessness before returning to Earth.
  • Sun-synchronous orbit: An orbit in which a satellite passes over a specific location on the Earth’s surface at the same local solar time on each pass.
  • Supercluster: A large group of galaxy clusters that are bound together by gravity.
  • Supercluster: A large grouping of galaxy clusters that can contain tens of thousands of galaxies.
  • Supernova: A powerful explosion that marks the end of a star’s life, caused by the collapse of its core or the fusion of elements in its outer layers.
  • Supernova: A powerful explosion that occurs at the end of a massive star’s life, resulting in the formation of a neutron star or a black hole.
  • Supernova: A powerful explosion that occurs at the end of a star’s life, resulting in the destruction of the star and the formation of new elements.
  • Supernova: The explosion of a star, which can release as much energy as the Sun will produce in its entire lifetime.
  • Supernova: The explosive death of a star, resulting in a bright burst of light and the formation of a supernova remnant.
  • Supernova: The explosive death of a star, which can briefly outshine an entire galaxy.
  • Supersonic: Refers to velocities greater than the speed of sound, often used in the context of aircraft and atmospheric flight.
  • Synchronous orbit: An orbit around a celestial body in which the satellite has the same rotational period as the body it is orbiting.
  • Telemetry: The process of transmitting and receiving data from a spacecraft to a ground station.
  • Telepresence: The use of technology to remotely control and operate a robot or other device as if the operator were physically present.
  • Telescope: An instrument used to observe distant objects by collecting and focusing electromagnetic radiation, such as light.
  • Terraforming: The process of altering a planet’s atmosphere, temperature, and surface to make it more Earth-like and habitable for humans.
  • Terrestrial planets: The four innermost planets in the Solar System; are Mercury, Venus, Earth, and Mars. They are called terrestrial because they are primarily composed of rock or metal.
  • Tether: a long, strong cable or rope that is attached to two or more points and used to hold or pull something.
  • Thermosphere: The layer of the Earth’s atmosphere that extends from about 85 km to 600 km above the Earth’s surface and is characterized by high temperatures caused by solar radiation.
  • This list is not exhaustive, and there could be more specific terms and definitions within each field that are not mentioned here.
  • Thrust: The force that propels a spacecraft or launch vehicle forward.
  • Time dilation: A difference in the elapsed time measured by two observers, due to a velocity difference relative to each other or by being differently situated relative to a gravitational field.
  • Time dilation: A difference in the elapsed time measured by two observers, due to a velocity difference relative to each other, or by being differently situated relative to a gravitational field.
  • Trajectory: The path that a spacecraft or object follows through space.
  • Transit: The passage of a planet or other celestial body across the face of the Sun or another celestial body as seen by an observer.
  • Trans-Neptunian Object (TNO): A minor planet in the Solar System that orbits the Sun at a greater distance on average than Neptune.
  • Trans-Neptunian object: Objects in the solar system orbit the sun at a greater average distance than Neptune.
  • Troposphere: The lowest layer of the Earth’s atmosphere, extending from the surface to about 10 km above the Earth’s surface and characterized by weather and atmospheric turbulence.
  • Ultraviolet (UV) radiation: Electromagnetic radiation with wavelengths shorter than visible light, but longer than X-rays. It can cause sunburn and other types of skin damage, and can also be harmful to the eyes.
  • Universe: All matter and energy that exists, including all galaxies, stars, and planets.
  • Universe: The entirety of space and time, along with all the matter and energy that exists within it.
  • Universe: The entirety of space and time, including all matter and energy, and all the laws and constants that govern them.
  • Universe: The entirety of space and time, including all matter and energy, and the physical laws and constants that govern them.
  • Variable star: A star that changes in brightness over time, either periodically or irregularly.
  • Virtual reality (VR) in space: The use of VR technology in space-related activities, such as spacecraft design and training, as well as scientific research and public outreach.
  • Virtual reality (VR): A computer-generated simulation of a three-dimensional environment that can be interacted with using specialized equipment, such as a headset and gloves.
  • Warp drive: A hypothetical propulsion system that would allow faster-than-light travel by warping the fabric of spacetime.
  • Warp drive: A proposed method of faster-than-light travel inspired by the science fiction franchise “Star Trek”.
  • Wavelength: The distance between two consecutive peaks (or troughs) of a wave, such as a light wave or a sound wave.
  • Weather satellite: A type of satellite used for monitoring weather conditions on Earth, such as temperature, precipitation, and cloud cover.
  • Weightlessness: The condition of being in a state of free fall, such as in orbit around a celestial body, where gravity is still present but its effect is not noticeable.
  • White Dwarf: A small, dense star that is the remnant of a low-mass star that has exhausted the nuclear fuel in its core.
  • White dwarf: The extremely dense remnant of a star that has exhausted the nuclear fuel in its core and has shed its outer layers.
  • White dwarf: The remnant of a star that has exhausted the nuclear fuel in its core, characterized by its incredibly high density and small size.
  • White Dwarf: The small, extremely dense remains of a star that has exhausted its nuclear fuel and shed its outer layers.
  • Wormhole: A hypothetical tunnel through space-time that could potentially connect distant regions of the universe or even different universes.
  • Zero gravity: A common term for weightlessness, but it is not accurate as gravity is always present.
  • Zero gravity: The condition of complete weightlessness, typically experienced by objects in free fall or orbiting around a celestial body.