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?

Print out this page and fill in your answers. There are 50 versions of this puzzle.

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