Cassini division


Cassini divisionThe black band in the center of this close-up view of Saturn's rings is theCassini division.

Cas·si·ni division

C0145300 (kə-sē′nē)n. The large gap between the two most prominent of Saturn's rings, caused by the gravitational pull of the moon Mimas.
[After Giovanni Domenico Cassini (1625-1712), Italian astronomer.]

Cas•si′ni divi`sion

(kəˈsi ni, kɑ-)
n. a 3000-mi. (4800-km)-wide dark region between the middle and outermost rings of Saturn. [1905–10; after Giovanni Domenico Cassini (1625–1712), Italian astronomer who discovered it in 1675]