Sunday, June 20, 2010
Was Mars a Watery World?
This map of Mars was produced by two University of Colorado scientists using the latest imagery and published in Nature Geoscience. Tracing the ancient shoreline visible in photographs from the Mars Reconnaissance Orbiter and other probes, they estimate that 3.5 billion years ago the lowlands of Mars were covered by an ocean up to 550 meters deep. But this remains very controversial.