Eighth planet from the sun
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.
DiscoverySome of the earliest knownobservations ever, Galileo's drawings on 28 Dec. 1612 and 27 Jan. 1613 () contain plotted.
Neptune's mass of 1.0243×10kgis intermediate between Earth and the larger : it is 17 times that of Earth but just 1/19th .
The average distance between Neptune and the Sun is 4.5 billion km (about 30.1(AU), the mean distance from the.
Neptune has 16 known .is the largest Neptunian moon, accounting for more than 99.5% of the mass in orbit around Neptune,and is the only one massive enough to be . Triton was discovered byjust 17 days after the.
Neptune's weather is characterized by extremely dynamic storm systems, with winds reaching speeds of almost 600 m/s (2,200 km/h; 1,300 mph)—exceedingflow.
FormationThe formation of the ice giants, Neptune and Uranus, has been difficult to model precisely. Current.
Neptune has asystem, though one much less substantial than that ofand .The rings may consist of ice.
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