The Mars Reconnaissance Orbiter marked 10 years of circling the Red Planet earlier this month, sending back a continuing stream of amazing photos from the HiRISE camera managed by the University of Arizona. Phil Plait, who blogs at Bad Astronomy, posted a wonderful retrospective of spectacular HiRISE images, including some I had not seen before. The one below shows an avalanche cloud caught live in 2010 [Credit, NASA/JPL-Caltech/University of Arizona]
Cladophlebis denticulata Plant Fossil
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