Greenland's Mega Canyon Hidden for all of human history, a 460 mile long canyon has been discovered below Greenland's ice sheet. Using radar data from NASA's Operation IceBridge and other airborne campaigns, scientists led by a team from the University of Bristol found the canyon runs from near the center of the island northward to the fjord of the Petermann Glacier. Watch the video:Hidden for All of Human History, a 460 Mile Long Mega Canyon has been Discovered in Greenland https://www.youtube.com/watch?v=Z1QsoBAUlac Image: NASA IceBridge, a six-year NASA mission, is the largest airborne survey of Earth's polar ice ever flown. It will yield an unprecedented three-dimensional view of Arctic and Antarctic ice sheets, ice shelves and sea ice.
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