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Extreme Life and Environments
Jason Dworkin, an astrobiologist at the Goddard Space Flight Center in Greenbelt, Md., holds a stromatolite, a layered sedimentary rock formed by bacteria eons ago. If such a rock were discovered on Mars, it could indicate that primitive life had once taken root on the red planet. Click on image to enlarge. Credit: NASA
01/14/09

 



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