The spectral collection you see above was first spied by MIT's LINEAR, and then further investigated by the Hubble telescope. What looks to an alien ship decloaking a comet trail was actually found to be a collection of debris from two asteroids colliding. It now orbits in the belt between Mars and Jupiter.
From NASA:
… what Hubble saw indicates that P/2010 A2 is unlike any object ever seen before. At first glance, the object appears to have the tail of a comet. Close inspection, however, shows a 140-meter nucleus offset from the tail center, very unusual structure near the nucleus, and no discernable gas in the tail. Knowing that the object orbits in the asteroid belt between Mars and Jupiter, a preliminary hypothesis that appears to explain all of the known clues is that P/2010 A2 is the debris left over from a recent collision between two small asteroids. If true, the collision likely occurred at over 15,000 kilometers per hour — five times the speed of a rifle bullet — and liberated energy in excess of a nuclear bomb.
See the a larger image of the debris here.
