These icy features are bordered by two quasi-symmetric ridge pairs, separated by a central valley, according to the study. The ridges are etched all across Europa, but they are rare on our own planet. Only within the past decade have the structures been observed in any detail, by two NASA missions: the ICESat-2 satellite and the airborne Operation IceBridge project.
ICESat-2 captured the formation of double ridges in Northwestern Greenland beginning in 2013, while subsequent IceBridge observations revealed that there are pools of shallow water, called sills, underneath them.
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