Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.292..435r&link_type=abstract
Nature, vol. 292, July 30-Aug. 5, 1981, p. 435, 436.
Astronomy and Astrophysics
Astronomy
36
Astronomical Models, Diamonds, Neptune (Planet), Planetary Composition, Shock Waves, Uranus (Planet), Ammonia, Carbon, Graphite, Helium, Hydrogen, Ice Environments, Methane, Phase Diagrams, Pyrolysis, Planets, Uranus, Layers, Neptune, Interiors, Composition, Carbon, Ice, Pressure, Temperatures, Experiments, Theoretical Studies, Conductivity, Methane, Hydrogen, Helium, Ammonia, Ionization, Pyrolysis, Structure, Metals, Shock Waves, Electrical Properties, Water
Scientific paper
Many of the current models of Uranus and Neptune postulate a three-layer structure, consisting of an inner rocky core, a middle 'ice' layer of fluid, H2O, CH4, NH3 and an outer hydrogen-helium layer of solar composition (Hubbard and McFarland, 1980). The estimated pressures and temperatures of the ice layer ranges from about 6 Mbar and 7,000 K at the inner core-ice boundary, to approximately 0.2 Mbar and 2,200 K at the outer ice/hydrogen-helium boundary. It is pointed out that shockwave experiments on these liquids, as well as theoretical studies, imply that the H2O and NH3 in the ice layer are almost totally ionized and the CH4 has been pyrolysed to carbon, possibly in the metallic or diamond form.
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