Millions of years ago two large asteroids collided in the asteroid belt. Pieces were sent flying in all directions. A few of them were put into orbits which rise high above and below the plane of the solar system as they continued to travel around the Sun. A fragment is discovered from a collision long ago as it comes near the Earth. Fortunately this space rock will not strike the Earth anytime soon. It will continue to orbit the Sun in the silent vacuum of space until it has a collision with another asteroid or comet in the far distant future.