What is the difference between a comet and an asteroid?
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A comet is composed primarily of water ice along with other frozen gases. It may have a rocky core, but the comet’s ice is its distinguishing feature. When it gets close to a star, a comet will begin shedding its ice and leave a tail.
An asteroid is, more or less, just a big rock, though it could have ice and other elements on its surface and in the interior.
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