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Running Water Eroded a Frigid Early Mars

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Science  06 Jun 2003:
Vol. 300, Issue 5625, pp. 1496-1497
DOI: 10.1126/science.300.5625.1496


New analyses of the first direct measurements of martian topography suggest that precipitation--rain or snow--and flowing water helped shape Mars in its first billion years. Yet the conundrum remains: How could precipitation have occurred on a planet that was cold, if not severely frigid?

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