Universe - everything that exists, including stars, planets, and space., Galaxy - a huge group of stars, planets, and gas, Gravity - the force that pulls things down or keeps planets moving., Astronaut - A person who travels to space., Meteor - A rock from space that burns up in the sky., Star - A big ball of hot gas that gives off light., Planet - A large round object that moves around a star., Astronomy - the study of space, stars, and planets., Sun - the star at the center of our Solar System., Orbit - the path a planet or moon takes around a star., Rocket - A vehicle that flies into space,

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