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.
Small Body Missions
See how much you know about these missions.
Tempel 1 has become well known because it is the target for the Deep Impact mission but there are many other famous comets. While they are alike in many ways, there are some interesting facts about each one.