How do we know what we know about the composition of the rings of Saturn? How are we able to determine their thickness, and that they are made of water ice and rock debris?
In: Planetary Science
[The Cassini probe](https://en.wikipedia.org/wiki/Cassini%E2%80%93Huygens)
used its [spectrometer to determine the composition of the rings.](https://en.wikipedia.org/wiki/Optical_spectrometer)
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