World’s Strangest

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Dune Sea in Mars Crater

Photo: NASA/JPL-Caltech/University of Arizona The Mars┬áReconnaissance Orbiter’s HiRISE camera recently revealed fascinating shots of a dune sea of sorts in a crater of the Hellas impact basin. What has officials at NASA excited about the dunes is their symmetric nature. The dunes here are linear, thought to be due to shifting wind directions. In places, each dune [...]