Cosmic Collisions

Meteors have left deep scars all over the face of Earth and are responsible for one of the biggest extinctions in history. Scientists believe that it's not a question of if they'll strike again, but when.

This exploration of the cosmic neighborhood examines how collisions created Earth's moon, where gashes on Jupiter came from and how pieces of Mars ended up in Earth's backyards.

Scientists examine the cosmic battles being waged between celestial bodies as galaxies smash into each other, stars collide, and Earth's own galaxy marches toward a clash with its closest neighbor, Andromeda.