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When seen from the unlit side, the rings of Saturn present a much different appearance from that familiar to telescopic observers. Relatively opaque areas like the B Ring turn black, while lightly populated zones, such as the C Ring and the Cassini Division, prove to to excellent diffuse transmitters of sunlight. The A Ring, whith intermediate opacity, is at an intermediate level of brightness.
Image Note: Voyages to Saturn NASA SP-451 NASA Scientific and Technical Information Branch 1982 caption (page 171) PICNO 1023S1-001