Life began in Comets
Or so some people think...
http://www.space.com/scienceastronomy/070816_life_comets.html
Panspermia, while debatable, is definitely a very COOL theory. :-)
Comets in effect "impregnating" planets like a sperm impregnates an egg. Gotta love the macro-micro analogy, and it's possible philosophical meanings...
