Maybe you have seen comets and meteors speed across the sky or have heard that asteroids sometimes reach the earth. But did you know the universe also contains blinking lights called pulsars? These pulsars flash so regularly that you could almost set your watch by them. There are also black holes that can pull stars to their destruction, and a mysterious, dark unseen matter scattered throughout the universe. At the edge of the solar system are what astronomers think are millions of icy objects just waiting to become new comets.