Water once present on Mars
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Evidence from the Mars exploration rovers Spirit and Opportunity has led scientists to suggest that water was once present in large quantities on the red planet.
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NASA's Spirit and Opportunity have been exploring Mars about three times as long as originally scheduled. The more they look, the more evidence of past liquid water on Mars these robots discover.
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By Alicia Chang THE ASSOCIATED PRESS  For decades, scientists have scoured Mars in search of water, a basic ingredient for primitive life.  But the best clues were always tied to the ancient past when the Red Planet was warmer and wetter.
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NASA to allocate wellies budget? Pictures taken two years ago by Mars rover Opportunity might show puddles of liquid water on the Martian surface, according to New Scientist.â¦
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Pictures of Martian gullies taken years apart suggest that liquid water still flows on the planetÂs surface.
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LOS ANGELES: New photographs from space suggest that water occasionally flows on the frigid surface of Mars, raising the tantalizing possibility that the Red Planet is hospitable to life, scientists reported.
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BLOOMINGTON, Ind. -- Epsom-like salts believed to be common on Mars may be a major source of water there, say geologists at Indiana University Bloomington and Los Alamos National Laboratory...
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Sept. 8, 2004 - Mars may be cold, dry and dusty today but it once had a watery climate that lasted for much of its history, according to a study published in the British science journal Nature on Thursday.
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LOS ANGELES - NASA&#39;s Mars rover, Opportunity, has found more signs that rocks on the Red Planet were once submerged in water. Data sent by Opportunity suggest a crater was drenched a second time after drying out, scientists said.
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By RANDOLPH E. SCHMID Associated Press  WASHINGTON -- An orbiting spacecraft has sent back new evidence for the presence of water on Mars.    Scientists long have debated whether water flowed on the red planet, with evidence increasing in recent years.
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Images from the spacecraft show two craters that may have been altered by the recent flow of water
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LOS ANGELES - NASA&#39;s Spirit rover has found more evidence of past water on the hills of Mars, while its twin, Opportunity, has observed a field of dunes inside a crater.
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After months of crossing a vast Martian crater floor and zigzagging up low-slung hills, NASA&#39;s Spirit rover has spotted its first hint that water once coursed across the now-desert-like region, scientists said Wednesday.
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Researchers can now say definitively that Mars once  supported a watery environment, but whether the red planet could have ever  supported life is still far from certain.
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BEIJING, Aug. 19 (Xinhuanet) -- NASA&#39;s Mars rovers have uncovered more clues about how water shaped the Red Planet, scientists said Wednesday.
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Gostar Klingelhofer of Johannes Gutenberg University reported that NASA&#39;s Mars rover Spirit found a rock that had sizable amounts of an iron-containing mineral associated with water.
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NASA&#39;s Mars rovers have returned new evidence for past water, pictures of Earthlike clouds seen for the first time from the planet&#39;s surface, and a rock that doesn&#39;t look like anything scientists have ever seen.