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Climate change could explain Mars' imposing topography
Mars has lots of water, but future astronauts won't exactly be able to scoop it into bottles -- it's generally trapped in ice deposits below the surface. Scientists from Penn State think climate change lasting millions of years once warmed it enough to let the water flow free on the surface, however. That might have created large lakes in Gale Crater (above) and etched out channels and other water-based features on the Red Planet.
