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Saturn's Rings: Less Than Meets the Eye?

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Saturn's B ring most opaque of main rings

Saturn's B ring is the most opaque of the main rings, appearing almost black in this Cassini image taken from the unlit side of the ringplane.

Credit: NASA/JPL-Caltech/Space Science Institute

It seems intuitive that an opaque material should contain more stuff than a more translucent substance.

From Jet Propulsion Laboratory/NASA
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