单词 | Cassini division |
释义 | Cas·si·ni division ![]() 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.] ![]() The black band in the center of this close-up view of Saturn's rings is the Cassini division. |
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