Cassini divisionCas·si·ni division
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)
also Cassini's division
Origin of Cassini divisionafter G. D. Cassini (1625-1712), French astronomer, born in Italy
The large gap between the two most prominent of Saturn's rings, caused by the gravitational pull of the moon Mimas.
Origin of Cassini divisionAfter Giovanni Domenico Cassini (1625-1712), Italian astronomer
The black band in the center of this close-up view of Saturn's rings is the