Scientists examine the cosmic battles being waged between celestial bodies as galaxies smash into each other, stars collide with the force of several nuclear bombs, and black holes fuse in a deadly fireworks display. Even Earth's own galaxy marches toward a clash with its closest neighbor, Andromeda.
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 meteor clashes with Earth includes how scientists are preparing for the next deadly assault on this planet.