Few days ago NASA published a new surprising discovery - another firm proof of past presence of flowing water on Mars:
NASA - Mars Rover Spirit Unearths Surprise Evidence of Wetter Past
Quote:
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A no-longer functional wheel on the Spirit rover provided scientists with the best evidence yet that Mars once held water. Dragged along by the rover, the wheel unearthed a soil deposit composed of about 90% pure silica. ...
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Another article about it:
Wired Science - Wired Blogs
image credit © NASA
