On this day in 1789, William Herschel discovered the alluring icy world of Enceladus. https://t.co/ENj5Wuera3 http://pic.twitter.com/hFiRbqRrfa
— Planetary Society (@exploreplanets) August 28, 2016
via Twitter https://twitter.com/exploreplanets
August 28, 2016 at 07:51PM
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