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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.
Neptune, for example, has an atmosphere made of hydrogen and helium (with just a tinge of methane), and it doesn’t really have a surface—or, at least, not what we think of as a surface.
Neptune Odyssey is a flagship orbiter mission concept with similar goals as Trident and is targeted for a launch date of 2033. These missions have a high focus on learning more about Neptune's largest moon Triton, but also aim to gain more information about the atmosphere of Neptune.
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 ...
Around Neptune's equator, a thin bright line may indicate where the atmosphere is warming, and thus glowing at infrared wavelengths, compared to the surrounding gas, which is cooler, according to ...
Jupiter – the atmosphere contains 3000 ± 1000 ppm methane [137] Saturn – the atmosphere contains 4500 ± 2000 ppm methane [138] Enceladus – the atmosphere contains 1.7% methane [139] Iapetus [citation needed] Titan – the atmosphere contains 1.6% methane and thousands of methane lakes have been detected on the surface. [140]
New research unveils a surprising twist in the composition of our Solar System’s distant giants.
Generally, Neptune is depicted as a rich, deep blue. Uranus is usually seen as a pale green or cyan. In fact, however, they are much more similar than we thought. Both planets are a particular ...