In Mars rock, telltale ripples and mysteries
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NEW YORK With one Mars rover climbing into the hills and the other descending deep into a crater, scientists reported the discovery of several mysterious rock structures, along with yet more signs that Mars was once awash in water.
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Scientists controlling the Opportunity Mars rover are taking an up-close look at an intriguing pitted rock on Mars, now dubbed "Heat Shield Rock".
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By Warren E. Leary  Pictures of Martian gullies taken several years apart strongly suggest that water still flows at least occasionally on the surface of the planet, scientists have announced.
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A new hypothesis could explain how the climate of early Mars became warm enough to support oceans.
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PASADENA, Calif. - A patch of Martian soil analyzed by NASA's rover Spirit is so rich in silica that it may provide some of the strongest evidence yet that ancient Mars was much wetter than it is now.
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The rover Opportunity will soon go over the edge into Victoria Crater in search of new hints about Marsâs ancient, and possibly wet, past.
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DENVER, COLORADO -- Those twin robots hard at work on Mars have transmitted teasing views that reinforce the prospect that microbial life may exist on the red planet.
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During the last four weeks, the Mars Exploration Rovers have braved the Martian winter to continue their geologic field work, sending home more evidence of past liquid water on the Red Planet and images of bizarre geologic formations the likes ...
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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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Mars rover Spirit has found its own compelling evidence that liquid water flowed at its landing site on the Red Planet.
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Spirit, one of the two rovers exploring Mars, has discovered the first rock on the planet that scientists say could have formed only in water - - but whether the water was flowing, or lay like a shallow sea that came and went, remains unknown, the mission
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After studying thousands of images from Mars, scientists now are convinced that liquid water once flowed on the surface of the red planet, increasing the odds that life may have existed there in the distant past.
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An international team of scientists has found life on a Norwegian island.  No surprises there, but the successful field test of a collection of life-detection instruments may be a stepping stone for future endeavors to sniff out life on Mars.
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The hills of Mars yielded more tantalizing clues about how water shaped the Red Planet in tests by NASA&#39;s robotic geologist, Spirit, while its twin, Opportunity, observed the deep crater it climbed into two months ...
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NASA experts said they have detected evidence that liquid water existed on the surface of Mars in recent years, giving weight to hopes that signs of life on the Red Planet could still be found.
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NASA&#39;s Mars rover Opportunity has found an unusual pattern of cracking on a rock it discovered inside a Martian crater -- evidence, perhaps, that water may once have soaked parts of the crater bed, researchers said yesterday.
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In a prelude of more problems that are likely to arise, both of NASA's Mars    rovers experienced glitches this week as they plow through unknown engineering    territory, operating well beyond what the mission blueprints called for.