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I definitely wasn't supposed to be doing this this afternoon, but ...

A time lapse movie of the northern hemisphere of Saturn, showing a full rotation of the famous polar hexagon, a very cool fluid dynamics phenomenon in the planet's atmosphere

Taken by the NASA/ESA/ASI Cassini spacecraft over a 12.5 hour period on 3 & 4 April 2014: 35 ISS WAC images 512x512 pixels, CB2 filter at 752nm

Credit: NASA, JPL-Caltech, SSI, Mark McCaughrean