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What does an asteroid?

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Not everything in the main belt is an asteroid — Ceres, once thought of only as an asteroid, is now also considered a dwarf planet. In the past decade, scientists have also identified a class of objects known as "main belt asteroids," small rocky objects with tails. read more

Then, the Dawn spacecraft traveled to the asteroid belt in 2011 to orbit and study the second largest object there, Vesta. Vesta is so large it's like a small planet. In 2012 Dawn left Vesta and went into orbit around the largest object in the asteroid belt, dwarf planet Ceres. read more

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