Portal:Solar System

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The Solar System Portal

The Sun and planets of the Solar System

The Solar System consists of the Sun and the other celestial objects gravitationally bound to it: the eight planets, their moons, five currently identified dwarf planets and their seven known moons, and billions of small bodies. This last category includes asteroids, Kuiper belt objects, comets, meteoroids and interplanetary dust. In broad terms, the charted regions of the Solar System consist of the Sun, four terrestrial inner planets, an asteroid belt composed of small rocky bodies, four gas giant outer planets, and a second belt, called the Kuiper belt, composed of icy objects. Beyond the Kuiper belt lies the scattered disc, the heliopause, and ultimately the hypothetical Oort cloud. In order of their distances from the Sun, the planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Six of the eight planets are in turn orbited by natural satellites, usually termed "moons" after Earth's Moon, and each of the outer planets is encircled by planetary rings of dust and other particles. All the planets except Earth are named after gods and goddesses from Greco-Roman mythology. The five dwarf planets are Pluto, Makemake, and Haumea, the three largest known Kuiper belt objects; Ceres, the largest object in the asteroid belt; and Eris, the largest known object in the scattered disc.

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Makemake as seen by the Hubble Space Telescope.
Makemake is the third-largest known dwarf planet in the Solar System and one of the two largest Kuiper belt objects (KBO) in the classical KBO population. Its diameter is roughly three-quarters that of Pluto. Makemake has no known satellites, which makes it unique among the largest KBOs. Its extremely low average temperature (about 30 K) means its surface is covered with methane, ethane and possibly nitrogen ices. Initially known as 2005 FY9 (and later given the minor planet number 136472), it was discovered on March 31, 2005, by a team led by Michael Brown, and announced on July 29, 2005. On June 11, 2008, the IAU included Makemake in its list of potential candidates to be given "plutoid" status, a term for dwarf planets beyond the orbit of Neptune that would place the object alongside Pluto and Eris. Makemake was formally classified as a plutoid in July 2008.

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Jupiter
Credit: Cassini probe

Jupiter is the fifth planet from the Sun and by far the largest within the Solar System. It is 318 times more massive than Earth, with a diameter 11 times that of Earth, and with a volume 1300 times that of Earth. Its best known feature is the Great Red Spot, a storm larger than Earth, which was first observed by Galileo four centuries ago. This picture, taken by the Cassini orbiter was one of 26 thousand images taken of Jupiter during the course of its flyby and is the most detailed global color portrait of the planet ever produced.

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Rembrandt as seen by MESSENGER

Major topics

The Sun Mercury Venus The Moon Earth Mars Phobos and Deimos Ceres The main asteroid belt Jupiter Moons of Jupiter Saturn Moons of Saturn Uranus Moons of Uranus Neptune Moons of Neptune Pluto Moons of Pluto Haumea Moons of Haumea Makemake The Kuiper Belt Eris Dysnomia The Scattered Disc The Hills Cloud The Oort CloudSolar System Template Final.png

Solar System: Planets (Definition ˑ Planetary habitability ˑ Terrestrial planets ˑ Gas giants ˑ Rings) ˑ Dwarf planets (Plutoid) ˑ Moons ˑ Exploration ˑ Colonization ˑ Discovery timeline

Sun: Sunspot ˑ Solar wind ˑ Solar flare ˑ Solar eclipse
Mercury: Geology ˑ Exploration (Mariner 10 ˑ MESSENGER ˑ BepiColombo) ˑ Transit
Venus: Geology ˑ Atmosphere ˑ Exploration (Venera ˑ Mariner program 2/5/10 ˑ Pioneer ˑ Vega 1/2ˑ Magellan ˑ Venus Express) ˑ Transit
Earth: History ˑ Geology ˑ Geography ˑ Atmosphere ˑ Rotation
Moon: Geology ˑ Selenography ˑ Atmosphere ˑ Exploration (Luna ˑ Apollo 8/11) ˑ Orbit ˑ Lunar eclipse
Mars: Moons (Phobos ˑ Deimos) ˑ Geology ˑ Geography ˑ Atmosphere ˑ Exploration (Mariner ˑ Mars ˑ Viking 1/2 ˑ Pathfinder ˑ MER)
Ceres: Exploration (Dawn)
Jupiter: Moons (Amalthea, Io ˑ Europa ˑ Ganymede ˑ Callisto) ˑ Rings ˑ Atmosphere ˑ Magnetosphere ˑ Exploration (Pioneer 10/11 ˑ Voyager 1/2 ˑ Ulysses ˑ Cassini ˑ Galileo ˑ New Horizons)
Saturn: Moons (Mimas ˑ Enceladus ˑ Tethys ˑ Dione ˑ Rhea ˑ Titan ˑ Iapetus) ˑ Rings ˑ Exploration (Pioneer 11 ˑ Voyager 1/2 ˑ CassiniHuygens)
Uranus: Moons (Miranda ˑ Ariel ˑ Umbriel ˑ Titania ˑ Oberon) ˑ Rings ˑ Exploration (Voyager 2)
Neptune: Moons (Triton) ˑ Rings ˑ Exploration (Voyager 2)
Planets beyond Neptune
Pluto: Moons (Charon, Nix, Hydra, Kerberos, Styx) ˑ Exploration (New Horizons)
Haumea: Moons (Hi'iaka, Namaka)
Makemake
Eris: Dysnomia
Small bodies: Meteoroids ˑ Asteroids (Asteroid belt) ˑ Centaurs ˑ TNOs (Kuiper belt ˑ Scattered disc ˑ Oort cloud) ˑ Comets (Hale-Bopp ˑ Halley's ˑ Hyakutake ˑ Shoemaker-Levy 9)
Formation and evolution of the Solar System: History of Solar System formation and evolution hypotheses ˑ Nebular hypothesis
See Also: Featured content ˑ Featured topic ˑ Good articles ˑ List of objects

Bold articles are featured.
Italicized articles are on dwarf planets or major moons.

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