Killer Asteroids

I tried downloading the video, but it wouldn't work.

The video was about how all the meteors circle around space on the asteroid belt between mars and jupiter. Rock and metal left over from building the solar system, for the metoer, which circles around the belt. When they collide, they are sent flying out of the orbit of the belt at 20 kilometers a second. At that speed, an asteroid could hit the earth hard enough to do major damage.