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As with Uranus, this absorption of red light by atmospheric methane is part of what gives Neptune its faint blue hue, [85] which is more pronounced for Neptune's due to concentrated haze in Uranus's atmosphere. [86] [87] Neptune's atmosphere is subdivided into two main regions: the lower troposphere, where temperature decreases with altitude ...
Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times the mass of Earth and slightly larger than Neptune. [a] Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 astronomical units (4.50 × 10 9 km).
These envelopes nevertheless limit observation of the ice giants' interiors, and thereby the information on their composition and evolution. [2] Although Uranus and Neptune are referred to as ice giant planets, it is thought that there is a supercritical water-ammonia ocean beneath their clouds, which accounts for about two-thirds of their ...
English: Diagram of the planet Neptune. Upper atmosphere, top clouds. Atmosphere consisting of hydrogen, helium, and methane gas. Mantle consisting of water, ammonia, and methane ices. Core consisting of rock (silicates and nickel-iron).
Umbriel – methane is a constituent of Umbriel's surface ice; Neptune – the atmosphere contains 1.5 ± 0.5% methane [146] Triton – Triton has a tenuous nitrogen atmosphere with small amounts of methane near the surface. [147] [148] Pluto – spectroscopic analysis of Pluto's surface reveals it to contain traces of methane [149] [150]
From top to bottom: Mercury, Venus without its atmosphere, Earth and the Moon, Mars, Jupiter, Saturn, Uranus, and Neptune in false colour (not to scale) The following is a list of planet types by their mass, orbit, physical and chemical composition, or by another classification.
The term has nevertheless caught on, because planetary scientists typically use "rock", "gas", and "ice" as shorthands for classes of elements and compounds commonly found as planetary constituents, irrespective of what phase the matter may appear in. In the outer Solar System, hydrogen and helium are referred to as "gases"; water, methane, and ...
Main page; Contents; ... 3 Structure and composition of the Solar System. ... Physical characteristics of Neptune Structure of Neptune; Atmosphere of Neptune;