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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