This is an image of Neptune.
Click on image for full size
NASA
An Overview of Neptune's Atmospheric Evolution
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).
Unlike Jupiter or Saturn, which are made primarily of basic materials hydrogen and helium, Neptune is made mostly of icy material, the solid form of complex molecules such as methane, ethane, and water. The reason for this is because the nebula itself influenced the kind of material which formed near Neptune.
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