Nasa spacecraft has captured an avalanche of fine ice and dust thundering over a cliff near Mars's north pole.
It's not the first avalanche captured by the HiRISE camera aboard the Mars Reconnaissance Orbiter - Nasa first detected the phenomenon in 2008, believed to be caused by a thin 'crust' of frozen carbon dioxide (dry ice) which forms during the Martian winter.
Read more: http://www.dailymail.co.uk/sciencete...#ixzz1lssYjYjC
Must of been a sight!
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