Comet Shoemaker-Levy 9 fragments. The comet was torn into pieces when it passed by Jupiter due to the planet's massive gravitational pull in 1992, and hit Jupiter in 1994. Credit: HA Weaver, TE Smith, STScI, NASA
Comet NEAT (C/2001 Q4). Credit: NASA, NOAO, NSF, T. Rector, Z. Levay, L. Fratarre
