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On this day 47 years ago voyager proved the existence of volcanoes on Io

No.23679 View View Original Report
On this day 47 years ago voyager proved the existence of volcanoes on Io, the moon of jupiter which was "probably the greatest surprise". Which marked the body as one of the few in our solar system with confirmed active volcanism/cryovolcanism
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see https://en.wikipedia.org/wiki/Voyager_1#Flyby_of_Jupiter