Search results
Results from the WOW.Com Content Network
Neptune's mass of 1.0243 × 10 26 kg [8] is intermediate between Earth and the larger gas giants: it is 17 times that of Earth but just 1/19th that of Jupiter. [ g ] Its gravity at 1 bar is 11.15 m/s 2 , 1.14 times the surface gravity of Earth, [ 71 ] and surpassed only by Jupiter. [ 72 ]
Neptune has been directly explored by one space probe, Voyager 2, in 1989. As of 2024 , there ... opening an optimal launch window with a 12-year interval, ...
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.
Neptune was discovered just after midnight, [1] after less than an hour of searching and less than 1 degree from the position Le Verrier had predicted, a remarkable match. After two further nights of observations in which its position and movement were verified, Galle replied to Le Verrier with astonishment: "the planet whose place you have ...
S/2021 N 1 is the smallest, faintest, and most distant natural satellite of Neptune known, with a diameter of around 16–25 km (10–16 mi). It was discovered on 7 September 2021 by Scott S. Sheppard, David J. Tholen, Chad Trujillo, and Patryk S. Lykawka using the 8.2-meter Subaru Telescope at Mauna Kea, Hawaii, and later announced on 23 February 2024. [1]
year Mercury Venus Mars Ceres Jupiter Saturn Uranus Neptune Pluto End year 1 Venera 3: 1965 Crash landing 1966 2 Pioneer 10: 1972 Flyby 2003 3 Pioneer 11: 1973 Flyby Flyby 1995 4 Mariner 10: 1973 Flyby Flyby 1975 5 Voyager 1: 1977 Flyby Flyby — 6 Voyager 2: 1977 Flyby Flyby Flyby Flyby — 7 Galileo: 1989 Flyby Orbiter 2003 8 Ulysses: 1990 ...
[note 1] By far the largest of them is Triton, discovered by William Lassell on 10 October 1846, 17 days after the discovery of Neptune itself. Over a century passed before the discovery of the second natural satellite, Nereid , in 1949, and another 40 years passed before Proteus , Neptune's second-largest moon, was discovered in 1989.
Rings of Neptune imaged by the James Webb Space Telescope's NIRCam instrument. The rings of Neptune consist primarily of five principal rings.They were first discovered (as "arcs") by simultaneous observations of a stellar occultation on 22 July 1984 by André Brahic's and William B. Hubbard's teams at La Silla Observatory (ESO) and at Cerro Tololo Interamerican Observatory in Chile. [1]