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Neptune's atmosphere is faintly blue in the optical spectrum, only slightly more saturated than the blue of Uranus's atmosphere. Early renderings of the two planets greatly exaggerated Neptune's colour contrast "to better reveal the clouds, bands and winds", making it seem deep blue compared to Uranus's off-white.
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 ...
Ice giants have distinctly different interior compositions from gas giants. The Solar System's ice giants, Uranus and Neptune, have a hydrogen-rich atmosphere that extends from the cloud tops down to about 80% (Uranus) or 85% (Neptune) of their radius. Below this, they are predominantly "icy", i.e. consisting mostly of water, methane, and ammonia.
“Uranus and Neptune are commonly considered ice giants, and it is often assumed that, in addition to a solar mix of hydrogen and helium, they contain roughly twice as much water as rock,” the ...
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The outermost portion of their hydrogen atmosphere contains many layers of visible clouds that are mostly composed of water (despite earlier consensus that there was no water anywhere in the Solar System besides Earth) and ammonia. The layer of metallic hydrogen located in the mid-interior makes up the bulk of every gas giant and is referred to ...
Neptune is considered an "ice giant" because of its internal chemical composition. Unlike Jupiter and Saturn, the gas giants of the outer solar system, Neptune is richer in elements heavier than ...
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]