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RT @marcuschown: And we think WE get droughts @dvergano: Rain on #Mars northern highlands halted about 3.7 billion years ago. Abs: http://t.co/t5LADg1
RT @marcuschown: And we think WE get droughts @dvergano: Rain on #Mars northern highlands halted about 3.7 billion years ago. Abs: http://t.co/t5LADg1