Mars Used To Be Very, Very Wet

July 21st, 2008

The red planet was once awash in water, say scientists — not boiling water, but benign seas that may have been suitable for life.

“There was apparently pervasive water present during the first 600 to 700 million years,” said Brown University geologist John Mustard, co-author of a paper scheduled to be published today in Nature.

Mustard’s team studied data returned by the Compact Reconnaisance Imaging Spectrometer for Mars, an instrument designed to find traces of minerals that interact with water.

Earlier studies have found evidence of ancient gushers, and the Mars Phoenix Lander recently found ice. But Mustard’s analysis provides the clearest picture yet of planet-wide hydrological impacts — and, most tantalizingly, CRISM showed widespread deposits of clay-like minerals that form only at relatively low temperatures.

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{Photo: Martian “smiley”}