This is an image of Saturn.
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An Overview of the Evolution of Saturn's Atmosphere
Atmospheres of the giant planets have definitely evolved from their formation
out of the primitive solar nebula. How much they have evolved remains to be seen, however. Because of their enormous gravity, most of the original atmosphere of the planet remains in place
. (The terrestrial planets lost all of the original atmosphere they were made with, because the atmosphere drifted away).
Saturn is made primarily of the basic materials hydrogen and helium, which is what existed in the vicinity of Saturn when it was forming.
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