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Hiding an Ocean
Featured on June 20, 2015
A deep ocean may lie far below the icy crust of Ganymede, the largest moon of Jupiter. In this image, compiled from several satellite views, dark regions are the oldest on Ganymede's surface, while lighter regions are much younger. The bright feature at bottom was formed by a recent impact, which created a crater and splashed out bright, fresh ice across hundreds of miles. [NASA/JPL]
