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What is the kuiper belt and what kinds of comets come from it?
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We just landed a spacecraft on a comet for the first time. Here's why
Comet Lovejoy Glows Brightest During Mid-January - Sky & Telescope
Astronomers Think They Know Where Rosetta's Comet Came From - Universe
Why Do Comets Come Back, Instead of Veering Off Into Space?
Scientists prove comets can't explain alien megastructure - Business
Where do comets come from?
Comet Catalina’s Glowing Tail Indicates Comets Delivered Carbon to