Saturn's moons Janus and Tethys: made of similar materials, but very different worlds https://t.co/DbtkadmS5g http://pic.twitter.com/DD74u3OfHn
— CassiniSaturn (@CassiniSaturn) February 29, 2016
via Twitter https://twitter.com/CassiniSaturn
February 29, 2016 at 09:51PM
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