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Astronomers have used telescope data to color-correct Voyager 2 images of Neptune and Uranus, revealing that the planets have a similar greenish blue hue.
Neptune is the eighth and farthest planet from the Sun, with a mostly hydrogen and helium atmosphere and 16 known moons. Its atmosphere is similar to Uranus's, with a dark blue colour and high winds, and has a cold temperature of about 72 K at one bar pressure.
Learn about the five principal rings of Neptune, their history of detection, and their unique features such as the Adams ring arcs. Find out how the rings are made of dark organic material, how they interact with moons and other rings, and how they were imaged by Voyager 2 and Webb.
John Couch Adams was an English astronomer who independently calculated the position of Neptune in 1845, based on the irregularities in Uranus' orbit. He did not observe the planet himself, but his work influenced Urbain Le Verrier, who discovered Neptune in 1846 with Johann Gottfried Galle.
Uranus is the seventh planet from the Sun and the third-largest in diameter. It is a gaseous cyan-coloured ice giant with a complex atmosphere and a retrograde rotation. Learn more about its physical characteristics, satellites, rings and exploration history.
The rings of Uranus are intermediate in complexity between the more extensive set around Saturn and the simpler systems around Jupiter and Neptune. They were discovered in 1977 by James L. Elliot, Edward W. Dunham, and Jessica Mink, and imaged by Voyager 2 and Hubble Space Telescope.
Learn about the only space probe that visited Neptune, Voyager 2, and its discoveries of the planet's atmosphere, rings, moons and magnetosphere. Find out about possible future missions to the Neptunian system and their challenges and benefits.
A giant planet, also known as a jovian planet, is a diverse type of planet much larger than Earth, composed of low-boiling point materials. There are four giant planets in the Solar System: Jupiter, Saturn, Uranus, and Neptune, which have different compositions and are sometimes called gas giants or ice giants.