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Iapetus
Iapetus
Diameter 1,436 km
892 mi.
Distance from primary 3,561,300 km
2,212,889 mi.
Nickname(s) Saturn's Yin-Yang Moon

Iapetus is the seventeenth moon of Saturn. The astronomer Cassini first viewed Iapetus with a telescope. The satellite was observed to "disappear" every 40 days, half of its 79-day orbit. Cassini noticed that the "winking" moon's entire hemisphere was vastly brighter than the other side and the moon was synchronously rotating.[1]

ReferencesEdit

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