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Saturn's moon Dione reveals its past via contrasts on its surface. Details: https://t.co/mCmZY22d86 http://pic.twitter.com/XUk59VSgeu

— CassiniSaturn (@CassiniSaturn) August 22, 2016

via Twitter https://twitter.com/CassiniSaturn

August 22, 2016 at 08:03PM