Cassini-division meaning

kə-sē'nē
The large gap between the two most prominent of Saturn's rings, caused by the gravitational pull of the moon Mimas.
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The gap or dark region between the two main outer rings of Saturn: it has a width of about 4,700 km (2,920 mi)
noun
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The large gap between Saturn's two most prominent rings (the outer A ring and middle B ring), appearing as a dark void but actually containing small amounts of opaque material. It is formed as a result of particles being removed from the area by the gravitational pull of Mimas, one of the smaller of Saturn's moons. The division is named after the Italian astronomer, Giovanni D. Cassini (1625–1712), who discovered it in 1675.
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Origin of cassini-division

  • After Giovanni Domenico Cassini (1625–1712), Italian astronomer
    From American Heritage Dictionary of the English Language, 5th Edition