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Neptune was visited by Voyager 2, which flew by the planet on 25 August 1989; Voyager 2 remains the only spacecraft to have visited it. [ 22 ] [ 23 ] Like the gas giants ( Jupiter and Saturn ), Neptune's atmosphere is composed primarily of hydrogen and helium , along with traces of hydrocarbons and possibly nitrogen , but contains a higher ...
The planet Neptune was mathematically predicted before it was directly observed. With a prediction by Urbain Le Verrier , telescopic observations confirming the existence of a major planet were made on the night of September 23–24, Autumnal Equinox of 1846, [ 1 ] at the Berlin Observatory , by astronomer Johann Gottfried Galle (assisted by ...
Johann Gottfried Galle, 1880 Memorial plaque in Wittenberg. Johann Gottfried Galle (9 June 1812 – 10 July 1910) was a German astronomer from Radis, Germany, at the Berlin Observatory who, on 23 September 1846, with the assistance of student Heinrich Louis d'Arrest, was the first person to view the planet Neptune and know what he was looking at.
Triton, the largest moon of the ice giant planet Neptune, is hypothesized to have been captured from heliocentric orbit. Triton is unusual as it is the only known large moon on a retrograde , highly- inclined orbit; that is, Triton orbits in the opposite direction Neptune rotates, and its orbit is not aligned with Neptune's equatorial plane.
The following outline is provided as an overview of and topical guide to Neptune: . Neptune – eighth and farthest known planet from the Sun in the Solar System.In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet.
The Planet Neptune: An Historical Survey before Voyager. Praxis. Sampson, R.A. (1904). "A description of Adams's manuscripts on the perturbations of Uranus". Memoirs of the Royal Astronomical Society. 54: 143– 161. Bibcode:1904MmRAS..54..143S. "John Couch Adams and the discovery of Neptune". Occasional Notes of the Royal Astronomical Society.
K2-33b (also known by its EPIC designation EPIC 205117205.01) is a very young super-Neptune exoplanet, orbiting the pre-main-sequence star K2-33.It was discovered by NASA's Kepler space telescope on its "Second Light" mission.
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 ...