Yep, Curiosity (as it's also known) is going to be pretty nifty - a rover the size of a small car, with a nuclear (RTG) power pack! Though I'm a bit worried about the method they're using to land it on the surface - a "skycrane", which basically consists of a rocket-powered platform which lowers down while suspending the rover below it.
This video shows what will happen: http://www.youtube.com/watch?v=_KLxmGLZQSY
There is just sooooo much that can go wrong with that, I think! (though if it does work as planned, that'd be a pretty huge engineering triumph!)
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