Early Mars 'too salty' for life
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The quest to find traces of life on Mars looks gloomy after Nasa says the Red Planet was 'too salty'.
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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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PARIS - Water vapour and methane are concentrated in the same areas of the Martian atmosphere, a finding that hints at new ways to hunt for life on the planet, scientists say.
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Water vapour and methane gas have been found in the same places on Mars, strengthening speculation that the Red Planet could be a haven for microbial life, space scientists say.
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Curious polygon shapes on the surface of Mars are among the latest evidence clearly suggesting the presence of water, and some of it may have appeared there even after the surface was bombarded by objects from distant space.
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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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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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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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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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New methane readings from a space probe raise the possibility that microbial life could exist on Mars. Some scientists, though, remain skeptical.
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The US space agency NASA says one of its two rovers on Mars has found possible fresh evidence that liquid water existed there in the past.
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Scientists handling the next Mars mission say the only way a significant dust storm like the one raging on Mars in recent days could seriously harm their spacecraft is if one were to suddenly whip up during the critical descent phase.
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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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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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By JOHN JOHNSON JR.  NASA scientists announced Wednesday that they had found evidence that water still flows over the surface of Mars - sporadic gushers that increase the possibility that the Red Planet could harbor some form of life.
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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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Concentrations of water vapor and methane gas in certain regions of the red planet strengthen speculation that Mars could be a haven for microbial life.