From NASA's Planetary Photojournal
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, with intermediate opacity, is at an intermediate level of brightness.
Image Title: Saturn's Rings
Catalog #: PIA02241
Target Name: Saturn's rings
Spacecraft: Voyager 1
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Last Modified On: Monday, December 18, 2000