ocr: STRUCTURE Gas Layer: 9000 km thick Ice Layer : 7500 km thick Core: 8000 km in radius Composition The internal structure of Neptune is thought to be very much like that of Uranus. At the center of Neptune lies a core of rock and metal, with a thick layer of water, methane, and ammonia ices above it. Surrounding the ice is a layer of hydrogen, helium, and methane that reaches to the top of the atmosphere. Compared to Uranus, a larger proportion of the material in Neptune is dense rock; consequently Neptune, although its diameter is only 96% that of Uranus, is actually 18% more massive than its n ...
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