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Cassini division

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Cassini division

Prominent gap in the rings of Saturn. It was discovered by the Italian-born French astronomer Giovanni Cassini in 1675. Some 5,000 km/3,100 mi wide, the Cassini division separates the faint outer A-ring from the brighter inner B-ring. It is now known that the division is caused by the gravitational influence of Mimas, one of the moons of Saturn.


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These ringlets showed up in the Cassini Division, a large gap between Saturn's third and fourth main rings.
In a quartet of novels--The Star Fraction (1995), The Stone Canal (1996), The Cassini Division (1998), and The Sky Road (1999)--MacLeod sets up several societies then lets them loose in something akin to the real world, where they can compete, infiltrate each other, and try to come to terms with their internal contradictions.
The large gap between rings B and A is called the Cassini division.
 
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