universe - all of space and everything in it (such as stars, planets, and galaxies), Milky Way - a galaxy inside our universe that is made up of billions of stars, black holes, planets, moons, and asteroids, galaxy - a collection of stars spiraling together through space, Earth - the planet on which we live, gravity - a force that attracts objects toward each other, planet - a large, round object in space that travels around a star,

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