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Neptune is the eighth and farthest known planet from the Sun. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times the mass of Earth. Compared to its fellow ice giant Uranus, Neptune is slightly more massive, but denser and smaller.
Discovery observation: 24 September 1846. The 9" refractor which was used to discover Neptune is at Deutsches Museum in Munich today. Le Verrier was unaware that his public confirmation of Adams' private computations had set in motion a British search for the purported planet.
Johann Gottfried Galle. 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. Urbain Le Verrier had predicted ...
The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
Neptune has been directly explored by one space probe, Voyager 2, in 1989. As of 2024, there are no confirmed future missions to visit the Neptunian system, although a tentative Chinese mission has been planned for launch in 2024. [1] NASA, ESA, and independent academic groups have proposed future scientific missions to visit Neptune.
Neptune, for example, has an atmosphere made of hydrogen and helium (with just a tinge of methane), ... Thomas Edison's creepy 134-year-old talking doll 'the stuff of nightmares'
The Great Dark Spot (also known as GDS-89, for Great Dark Spot, 1989) was one of a series of dark spots on Neptune similar in appearance to Jupiter 's Great Red Spot. In 1989, GDS-89 was the first Great Dark Spot on Neptune to be observed by NASA 's Voyager 2 space probe. Like Jupiter's spot, the Great Dark Spots are anticyclonic storms.
Such a fate awaits the moons Phobos of Mars (within 30 to 50 million years), [111] Triton of Neptune (in 3.6 billion years), [112] and at least 16 small satellites of Uranus and Neptune. Uranus's Desdemona may even collide with one of its neighboring moons.