Internal structur4

Internal structur4 - electrical conductivity, is sometimes...

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Internal structure Neptune's internal structure resembles that of Uranus . Its atmosphere forms about 5 to 10 percent of its mass and extends perhaps 10 to 20 percent of the way towards the core, where it reaches pressures of about 10 GPa . Increasing concentrations of methane , ammonia and water are found in the lower regions of the atmosphere. [17] The internal structure of Neptune: 1. Upper atmosphere, top clouds 2. Atmosphere consisting of hydrogen, helium and methane gas 3. Mantle consisting of water, ammonia and methane ices 4. Core consisting of rock (silicates and nickel-iron) The mantle reaches temperatures of 2,000 K to 5,000 K. It is equivalent to 10 to 15 Earth masses and is rich in water, ammonia and methane. [1] As is customary in planetary science, this mixture is referred to as icy even though it is a hot, highly dense fluid. This fluid, which has a high
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Unformatted text preview: electrical conductivity, is sometimes called a water-ammonia ocean. [45] At a depth of 7000 km, the conditions may be such that methane decomposes into diamond crystals that then precipitate toward the core. [46] The mantle may consist of a layer of ionic water where the water molecules break down into a soup of hydrogen and oxygen ions, and deeper down superionic water in which the oxygen crystallises but the hydrogen ions float around freely within the oxygen lattice. [47] The core of Neptune is composed of iron , nickel and silicates , with an interior model giving a mass about 1.2 times that of the Earth. [48] The pressure at the centre is 7 Mbar (700 GPa), millions of times more than that on the surface of the Earth, and the temperature may be 5,400 K...
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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