This is an image of Saturn.
Click on image for full size
NASA/JPL
An Overview of the Evolution of Saturn's Atmosphere
The giant planets have definitely changed since their
formation. But how much remains to be seen.
Most of the original air of the giant planets remains in place. (The earth-like planets lost most of their atmospheres very soon after they formed because the atmosphere drifted away).
Saturn is made primarily of the basic materials hydrogen and helium, which is what existed near Saturn when it was forming.
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