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Characteristics of comets - Astronomy's Space & Beyond Box
What is a Comet | Facts About Comets | DK Find Out
APOD: 2013 October 13 - Hale Bopp: The Great Comet of 1997
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What Exactly IS a Comet? - Science Friday
Photos of Halley's Comet Through History | Space
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There’s a comet passing by Earth. Here’s how to see it. - Vox
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