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@Well_is_it
Mars has got one hell of a whopper of a comet heading straight for it, due to do whatever it likes in October 2014. The comet (siding spring) travelling at 36 miles per second and is coming in against mars' own orbit so the combined speed will be huge.
NASA are sceptical that it will hit but will instead pass by at a similar orbit as our satellites over there. However, a comet's trajectory is changeable as they wobble their way across space due to bits coming off etc.
If it does hit mars, which is certainly possible, it will be amazing. We should be able to see it with the naked eye quite clearly. Also, the satellites will get one hell of a view either way, as will Curiosity, if its in the right place (or wrong).
Either way, its going to be spectacular.
Source: www.nasa.gov/mission_pages/asteroids/news/comet20130305.html