NASA’s flybys of Saturn’s moon Enceladus by their Cassini spacecraft reveal more evidence of an active world that continues to confound scientists.

William Herschel (1738–1822) discovered this moon in 1789 on his first night of viewing with the large new telescope he had built. Little was known about Enceladus until the 1980s, when the Voyager 1, Voyager 2 and Pioneer 11 spacecraft flew by Saturn…..

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