On this day in space! Oct. 25, 1671: Astronomer Giovanni Cassini discovers Iapetus, Saturn's 'yin-yang' moon
On Oct. 25, 1671, the Italian astronomer Giovanni Cassini discovered a new moon at Saturn! Here's why it mattered. Explore the content:
http://dlvr.it/TW3L8Y
http://dlvr.it/TW3L8Y

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