Here’s a ScienceCast report on the possibility that Comet 2013 A1 will hit Mars: ScienceCasts: Collision Course? A Comet Heads for Mars – YouTube
A comet is heading for Mars, and there is a chance that it might hit the Red Planet in October 2014. An impact wouldn’t necessarily mean the end of NASA’s Mars program. But it would transform the program along with Mars itself.