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Unformatted text preview: not well-defined interfaces. One "allowed" composition would be to have solar-like H/He with a rocky core. At the other extreme one could enrich all the other elements exceptall the other elements except Hydrogen, which gives 70% He, 20% ice and 10% rock by mass, with Hydrogen only in smaller quantities. This large range of possible models illustrates how difficult it is to "invert" the gravity field data to give a unique solution. Spectra taken from ground-based and space probe observations, and Voyager radio occultation experiments find CH 4 (methane) at 1.4 - 2% in the clouds, but condensation physics makes this measurement difficult. It seems likely there will be enhanced NH 3 (ammonia) too....
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- Fall '10