Neptuns

Neptuns is a plural form that may appear in some languages or contexts as the name of Neptune or as the name of mythic or fictional figures derived from the Roman god Neptune. In standard English usage, the planet is called Neptune, and Neptuns is seldom used outside linguistic discussions or specific titles.

Neptune is the eighth planet from the Sun and is classified as an ice giant. It orbits at an average distance of about 30 astronomical units and completes a year in about 164.8 Earth years. Its equatorial diameter is about 49,500 kilometers, and it has a mass roughly 17 times that of Earth.

Neptune's atmosphere is primarily hydrogen and helium, with methane giving the planet its distinctive blue color. Winds reach speeds of up to 2,100 kilometers per hour, making it one of the windiest planets. The planet exhibits large storm systems, such as the Great Dark Spot observed by Voyager 2 in 1989.

Neptune has a faint ring system and at least 14 known moons. The largest moon is Triton, which orbits in a retrograde direction and is believed to be a captured Kuiper belt object. Other notable moons include Nereid, Despina, Galatea, Larissa, Naiad, and Thalassa.

Neptune's existence was predicted by mathematical calculations by Urbain Le Verrier (and independently by John Couch Adams) in 1846, leading to its discovery. The first close flyby was conducted by NASA's Voyager 2 in 1989, with subsequent observations by ground-based and space telescopes advancing knowledge of the planet and its system.