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August 30 2013
NASA says airborne science missions reveal the existence of a previously unknown canyon, longer than the Grand Canyon, hidden under a mile of Greenland ice.
A study led by researchers at Britain's University of Bristol used radar data collected by NASA and researchers from the United Kingdom and Germany over several decades to piece together the landscape lying under the Greenland ice sheet, the space agency reported Wednesday.
The radar data revealed the canyon, with characteristics of a winding river channel, at least 460 miles long and as deep as 2,600 feet in some places, putting in a on a scale with segments of the Grand Canyon.
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