Planet Neptune PopSocket
- from our Affiliates
The gas planet Neptune glows a beautiful blue in this image taken by NASA’s Voyager 2 spacecraft. Features include a great dark spot and bright smudge which are clouds in the sky of Neptune. The atmosphere of this is primarily hydrogen and helium with traces of other elements. Neptune orbits past Uranus and the other planets and is now considered the outermost-known planet in the Solar System.