Comets
Links
Comet Shoemaker-Levy 9 Collision with Jupiter
http://seds.lpl.arizona.edu/sl9/sl9.html
Various pictures and information about this particular incident.
Jim Scotti's Comet page
http://pirlwww.lpl.arizona.edu/~jscotti/comets.html
Images of comets you've never heard of.
SL-9 and Jupiter
http://www.eso.org/outreach/info-events/sl9/
Offers several images of comets and planets.