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Mars once had falling snow, but lost it with the rest of its atmosphere

ExtremeTech - When dreamers looked at grainy, pre-Viking shots of the Martian surface, they interpreted the long, seemingly even furrows as farmland. They made up elaborate stories of doomed canal-builders working frantically to hold off the advance of the frozen tundra of Mars. They were dramatic stories that arrested people’s imaginations for decades, but despite evidence disproving the canal hypothesis we still struggle to fully explain the origins of many features of the Martian surface. Some, astronomers now believe, are ancient lake and river beds, valleys carved out by the flow of ancient liquid water.

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