[sunny D]

http://science.nasa.gov/headlines/y2...n.htm?list6979

February 2, 2010: NASA's Hubble Space Telescope has observed a mysterious X-shaped debris pattern and trailing streamers of dust that suggest a head-on collision between two asteroids. Astronomers have long thought that the asteroid belt is being ground down through collisions, but such a smashup has never been seen before.