{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Internal structur4 - electrical conductivity is sometimes...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online