Matching Pairs Mystery Writing Glossary AsteroidsOnline version vocab by Denise Kesel 1 impact 2 velocity 3 collision 4 meteor 5 atmosphere 6 diameter 7 orbit 8 deflect 9 asteroid circling another object, like the Moon around the Earth speed to cause an object to change direction after hitting something 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" a rocky object in outer space one object hitting into another object air that surrounds a planet the distance across an object