Scientists ponder whether ice on Mars ever melted (AP)

This combination of images provided by NASA's Phoenix Mars Lander's Surface Stereo Imager on Sunday, June 15, left, and Wednesday, June 18, 2008, right, or Sols 20 and 24, shows sublimation of ice in the trench informally called 'Dodo-Goldilocks' over the course of four days. In the lower left corner of the left image, a group of lumps is visible. In the right image, the lumps have disappeared. (AP Photo/NASA/JPL/CALTECH)AP - The apparent discovery of ice near Mars' north pole has scientists asking: Did the frozen water melt at some point in the planet's long history to create an environment friendly for life?





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