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Wednesday, January 18, 2017
NASA Possible Signs of Ancient Drying in Martian Rock
A grid of small polygons on the Martian rock surface near the right edge of this view may have originated as cracks in drying mud more than 3 billion years ago. via NASA http://www.nasa.gov/image-feature/jpl/pia21263/possible-signs-of-ancient-drying-in-martian-rock
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