Earth is bigger than the Moon. Earth's gravity pulls on the Moon. That is why the Moon orbits, or goes around, Earth. The SUN is bigger than Earth. Its gravity makes Earth go around the Sun. On a larger scale, gravity arranges cosmic bodies into orbits and even causes drifting space particles to pull together slowly into larger and larger clumps that eventually become planets, stars and galaxies.
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http://www.wonderwhizkids.com/index.php/gravity
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