Rocks Roll on Mars Too: New Images From HiRISE

The High Resolution Imaging Science Experiment (HiRISE) on board NASA's Mars Reconnaissance Orbiter (MRO) has done it again. When the instrument caught a Mars avalanche in action in March, we were able to witness a fairly common terrestrial event on a different planet. The impact was huge; we were all fascinated by the slide of rock and ice for weeks. Now looking on the very small-scale, HiRISE has picked up a seemingly mundane terrestrial occurrence: a rock rolling down a hill. But this rock rolled down a crater side on Mars, leaving a track in the Martian regolith big enough to be spotted by the MRO…

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