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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 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.
Astronomers have observed a mysterious large dark spot in Neptune’s atmosphere, along with a bright feature that has never been spotted before.
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.
Also seen in Neptune's upper atmosphere was an almond-shaped spot designated D2 and a bright, quickly moving cloud high above the cloud decks dubbed "Scooter". [4] [8] Voyager 2 image of Proteus. The fly-by of the Neptunian system provided the first accurate measurement of Neptune's mass, which was found to be 0.5 percent less than previously ...
Four years ago, astronomers noticed the abundant clouds on Neptune had largely disappeared. Telescope data may have helped researchers figure out why. Neptune’s clouds have disappeared, and ...
Triton, Neptune's largest moon, has a tenuous nitrogen atmosphere with small amounts of methane. Tritonian atmospheric pressure is about 1 Pa . The surface temperature is at least 35.6 K, with the nitrogen atmosphere in equilibrium with nitrogen ice on Triton's surface.
Neptune is shown in natural color with its largest satellite, Triton, as it orbits the planet. Triton orbits in a "backwards" or retrograde path relative to the other major satellites, and is opposite to Neptune's rotation. Zooming into Neptune, the colors were enhanced to show the subtle details in Neptune's atmosphere.