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Tuesday, October 17, 2017

To keep Saturn's A ring contained, its moons stand united

http://ift.tt/eA8V8J For three decades, astronomers thought that only Saturn's moon Janus confined the planet's A ring -- the largest and farthest of the visible rings. But after poring over NASA's Cassini mission data, astronomers now conclude that the teamwork of seven moons keeps this ring corralled.

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