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Il y a 1 jour · Uranus is the seventh planet from the Sun. It is a gaseous cyan-coloured ice giant. Most of the planet is made of water, ammonia, and methane in a supercritical phase of matter, astronomy calls "ice" or volatiles.
Il y a 6 jours · Uranium is a chemical element; it has 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 radioactively decays, usually by emitting an alpha particle.
Il y a 1 jour · The Sun is the star at the center of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies.
17 juin 2024 · Dans les profondeurs glacées de notre système solaire, une découverte scientifique intrigante pourrait enfin éclaircir l'un des mystères les plus complexes entourant Neptune et Uranus. Des...
Il y a 4 jours · Uranus, seventh planet in distance from the Sun and the least massive of the solar system’s four giant, or Jovian, planets, which also include Jupiter, Saturn, and Neptune. At its brightest, Uranus is just visible to the unaided eye as a blue-green point of light. It is designated by the symbol ♅.
- Uranus was discovered on March 13, 1781, by the English astronomer William Herschel with the aid of a telescope. Uranus is the first planet to be d...
- The mean distance of Uranus from the Sun is nearly 2.9 billion km (1.8 billion miles), more than 19 times as far as Earth, and it never approaches...
- On average, Uranus radiates the same amount of energy as an ideal, perfectly absorbing surface at a temperature of 59.1 kelvins (K; −353 °F, −214 °...
- Uranus has 27 known moons that are accompanied by at least 10 narrow rings. Generally, the rings are located closer to the planet than the moons. S...
- Unlike most planets, the axis of Uranus lies almost parallel to its orbital plane, which means that the planet spins nearly on its side, its poles...
13 juin 2024 · Uranus is an ice giant (instead of a gas giant). It is mostly made of flowing icy materials above a solid core. Uranus has a thick atmosphere made of methane, hydrogen, and helium. Uranus is the only planet that spins on its side. Uranus spins the opposite direction as Earth and most other planets. Time on Uranus.
Il y a 1 jour · Pluton, officiellement désignée par (134340) Pluton (désignation internationale : (134340) Pluto ), est une planète naine, la plus volumineuse connue dans le Système solaire (2 372 km de diamètre, contre 2 326 km pour Éris ), et la deuxième en ce qui concerne sa masse (après Éris).
