Two possibilities exist: Either we are alone in the Universe or we are not.
Both are equally terrifying.

— Arthur C. Clarke

Scientists Think Big Object Whacked Mars

By kuky at Thu, 06/26/2008 - 12:28pm

LOS ANGELES (June 25) - Why is Mars two-faced? Scientists say fresh evidence supports the theory that a monster impact punched the red planet, leaving behind perhaps the largest gash on any heavenly body in the solar system.

See full article:

http://news.aol.com/story/_a/scientists-think-big-object-whacked-mars/20...