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By Michael Marshall

NASA's Goddard Space Flight Center Scientific Visualization Studio

A valley longer than the Grand Canyon that is hidden under the Greenland ice sheet may carry flowing liquid water, according to a new analysis of the valley’s shape. The water could affect the movement of the Greenland ice sheet, causing parts of it to move faster or slower towards the sea.

The hidden canyon was first described in 2013 by glaciologist Jonathan Bamber of the University of Bristol in the UK and his colleagues. The valley runs for at least 750 …

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