Matching Pairs Mystery Writing Glossary AsteroidsOnline version vocab by Denise Kesel 1 deflect 2 collision 3 impact 4 orbit 5 diameter 6 velocity 7 asteroid 8 meteor 9 atmosphere a rocky object in outer space one object hitting into another object circling another object, like the Moon around the Earth the force of one thing hitting another a small object from space that enters the Earth's atmosphere. They often appear as glowing streaks in the sky or "Shooting Stars" the distance across an object to cause an object to change direction after hitting something speed air that surrounds a planet