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A place on Mars that was possibly habitable only 200 million years ago.
This article discusses the possibility of liquid water from the melting of the glaciers that scientists think once covered the western slopes of the giant volcano Arsia Mons. I have also written about this area in an article I wrote for Sky & Telescope last year on exploring caves in space. It is thought that there might be caves here in which some of that water from those glaciers might still be found.
As one scientist is quoted as saying in this article, “Arsia Mons would be the next place I would want to go.” Like the south pole of the Moon, it likely has all the ingredients for establishing a habitable colony.