Are those purple, wavy, alien thumbprints? Or perhaps an otherworldly ocean? Nope! It's actually a dune field on Mars, colored purple.
What is it?
Across the Martian surface are all sorts of unique features in the rocky, dusty surface material. In this false-color image, snapped by the HiRISE (High Resolution Imaging Science Experiment) camera on NASA's Mars Reconnaissance Orbiter, you can see the incredible and strange ripples of a dune field on Read Entire Article
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