What do you know about comets?

Some cultures once thought that comets were evil spirits. Now we know comets are, among other things, dirty snowballs of ice, dirt and rock. See how much you know about comets and if you get stuck, visit this page: Why Study Comets?

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For more information about the Deep Impact mission, the first mission
to make a deep crater in a comet, visit:
deepimpact.umd.edu
deepimpact.jpl.nasa.gov