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, 1846, at the Berlin Observatory, by astronomer Johann Gottfried Galle (assisted by Heinrich Louis d'Arrest), working from Le Verrier's …

Discovery and exploration of the Solar System is observation, visitation, and increase in knowledge and understanding of Earth's "cosmic neighborhood". This includes the Sun, Earth and the Moon, the major planets Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune, their satellites, as well as smaller bodies including comets, asteroids, and dust.

Neptune est la huitième planète par ordre d'éloignement au Soleil et la plus éloignée connue du Système solaire [N 2].Elle orbite autour du Soleil à une distance d'environ 30,1 au (4,5 milliards de kilomètres), avec une excentricité orbitale moitié moindre que celle de la Terre et une période de révolution de 164,79 ans.Il s'agit de la troisième planète la plus massive du ...

Uranium is a chemical element with the symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table.A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium has the highest atomic weight of the primordially occurring elements. Its density is about 70% higher than that of lead, and slightly lower than …

The first mention of rings around Neptune dates back to 1846 when William Lassell, the discoverer of Neptune's largest moon, Triton, thought he had seen a ring around the planet. However, his claim was never confirmed and it is likely that it was an observational artifact.The first reliable detection of a ring was made in 1968 by stellar occultation, although that result …

Historically, astrological and astronomical symbols overlapped. Frequently used symbols include signs of the zodiac and classical planets.These originate from medieval Byzantine codices. Their current form is a product of the European Renaissance.Other symbols for astrological aspects are used in various astrological traditions.

Premières observations. Neptune est invisible à l’œil nu car sa magnitude apparente n'est jamais inférieure à 7,7 [3].Les premières observations de Neptune ne furent donc possibles qu'après l'invention du télescope.. Neptune a été vue par Galilée en 1612-1613, Jérôme Lalande en 1795 et John Herschel en 1820, mais aucun n'a officiellement reconnu la planète à l'époque [4].

The scattered disc (or scattered disk) is a distant circumstellar disc in the Solar System that is sparsely populated by icy small solar system bodies, which are a subset of the broader family of trans-Neptunian objects.The scattered-disc objects (SDOs) have orbital eccentricities ranging as high as 0.8, inclinations as high as 40°, and perihelia greater than 30 astronomical units (4.5 × …

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, Great Dark Spots are anticyclonic storms.However, their interiors are relatively …

A planet is a large, rounded astronomical body that is neither a star nor its remnant.The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary disk.Planets grow in this disk by the gradual accumulation of material driven by gravity, a …