This is a composite image of the small moons of Saturn.
Click on image for full size
NASA
The Composition of Small Moons
What can be seen of the small moons may suggest a rocky composition because the surfaces seem to be covered with craters as if it were very hard. Composition is generally determined by detailed measurements of the
spectra of an object. But most of the small moons are
too small to be observed, so observations of this kind have yet to be made.
The Voyager spacecraft flew by some of the small moons of the Saturnian system and measured the density. The density of iron or rock is between 3 and 5. The density of ice is 1. Voyager measured the densities to be about 1.2 (refer to the reference information for exact measurements of the icy moons), which is closer to that of ice than rock, so most of these moons must be made out of ice, just as the icy moons are.
The fact that they are small and icy suggests a certain path for their evolution.
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