Space, the area beyond the Earth where there is no air and where all planets and stars exist., Universe, everything that exists, including all space, stars, planets, and galaxies., Galaxy, a large group of stars, gas, and dust held together by gravity., Planet, a large object that moves around a star and does not produce its own light., Asteroid, a small rocky object that orbits the Sun., Rocket, a vehicle that is used to travel into space., Spaceship, a vehicle designed for traveling in space., Satellite, an object that moves around a planet. It can be natural (like the Moon) or artificial (made by humans)., Space station, a large spacecraft where astronauts live and work in space., Solar system, the Sun and all the planets and other objects that move around it., Gravity, the force that pulls objects toward each other, especially toward the Earth., Astronaut, a person who travels and works in space..

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