Flying across Greenland more than 100 times, NASA's Operation IceBridge's ice penetrating radar produced a three dimensional view, peering back to an Earth as it was over 115,000 years ago.
Flying across Greenland more than 100 times, NASA's Operation IceBridge's ice penetrating radar produced a three dimensional view, peering back to an Earth as it was over 115,000 years ago.
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