Solar System

outer Solar Systeminner Solar SystemSol systeminner planetsinner planetThe Solar SystemSolarleave the Solar SystemplanetsSol
The Solar System is the gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly.wikipedia
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Mercury (planet)

Mercuryplanet MercuryMercurio
Of the objects that orbit the Sun indirectly—the moons—two are larger than the smallest planet, Mercury.
Mercury is the smallest and innermost planet in the Solar System.

Natural satellite

moonmoonssatellite
Of the objects that orbit the Sun indirectly—the moons—two are larger than the smallest planet, Mercury. Six of the planets, at least four of the dwarf planets, and many of the smaller bodies are orbited by natural satellites, usually termed "moons" after the Moon.
In the Solar System there are six planetary satellite systems containing 185 known natural satellites.

Jupiter

Jovianplanet JupiterGiove
The vast majority of the system's mass is in the Sun, with the majority of the remaining mass contained in Jupiter. The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are ice giants, being composed mostly of substances with relatively high melting points compared with hydrogen and helium, called volatiles, such as water, ammonia and methane.
Jupiter is the fifth planet from the Sun and the largest in the Solar System.

Venus

Morning Starevening starCytherocentric
The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal.
It has the longest rotation period (243 days) of any planet in the Solar System and rotates in the opposite direction to most other planets (meaning the Sun would rise in the west and set in the east).

Mars

Martianplanet MarsRed Planet
The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal.
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury.

Earth

terrestrialworldGlobal
The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal.
Earth is the densest planet in the Solar System and the largest of the four terrestrial planets.

List of gravitationally rounded objects of the Solar System

Gravitationally rounded objectaverage distance32 observationally confirmed such objects
Of the objects that orbit the Sun directly, the largest are the eight planets, with the remainder being smaller objects, such as the five dwarf planets and small Solar System bodies.
It contains almost 99.9 percent of all the mass in the Solar System.

Saturn

Saturn's atmosphereExploration of Saturnhome planet
The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are ice giants, being composed mostly of substances with relatively high melting points compared with hydrogen and helium, called volatiles, such as water, ammonia and methane.
Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.

Uranus

Uranian34 TauriGeorgium Sidus
The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are ice giants, being composed mostly of substances with relatively high melting points compared with hydrogen and helium, called volatiles, such as water, ammonia and methane.
It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System.

Terrestrial planet

terrestrial planetsrockyrocky planet
The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal.
Within the Solar System, the terrestrial planets are the inner planets closest to the Sun, i.e. Mercury, Venus, Earth, and Mars.

Neptune

NeptunianNeptune-masseighth planet
The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are ice giants, being composed mostly of substances with relatively high melting points compared with hydrogen and helium, called volatiles, such as water, ammonia and methane.
Neptune is the eighth and farthest known planet from the Sun in the Solar System.

Asteroid belt

main-beltmain beltmain-belt asteroid
The asteroid belt, which lies between the orbits of Mars and Jupiter, mostly contains objects composed, like the terrestrial planets, of rock and metal.
[[Image:InnerSolarSystem-en.png|300px|thumb|The asteroids of the inner Solar System and Jupiter: The donut-shaped asteroid belt is located between the orbits of Jupiter and Mars.

Kuiper belt

KBOKuiper belt objectsKuiper-belt
Beyond Neptune's orbit lie the Kuiper belt and scattered disc, which are populations of trans-Neptunian objects composed mostly of ices, and beyond them a newly discovered population of sednoids.
The Kuiper belt, occasionally called the Edgeworth–Kuiper belt, is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune (at 30 AU) to approximately 50 AU from the Sun.

Trans-Neptunian object

TNOcolor indicestrans-Neptunian
Beyond Neptune's orbit lie the Kuiper belt and scattered disc, which are populations of trans-Neptunian objects composed mostly of ices, and beyond them a newly discovered population of sednoids.
A trans-Neptunian object (TNO), also written transneptunian object, is any minor planet in the Solar System that orbits the Sun at a greater average distance than Neptune, which has a semi-major axis of 30.1 astronomical units (AU).

Giant planet

jovian planetgiant planetsJovian
The four outer planets are giant planets, being substantially more massive than the terrestrials.
There are four known giant planets in the Solar System: Jupiter, Saturn, Uranus and Neptune.

Scattered disc

SDOscattered diskscattered
Beyond Neptune's orbit lie the Kuiper belt and scattered disc, which are populations of trans-Neptunian objects composed mostly of ices, and beyond them a newly discovered population of sednoids.
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.

Ammonia

NH 3 anhydrous ammonialiquid ammonia
The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are ice giants, being composed mostly of substances with relatively high melting points compared with hydrogen and helium, called volatiles, such as water, ammonia and methane.
Ammonia is also found throughout the Solar System on Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto, among other places: on smaller, icy planets such as Pluto, ammonia can act as a geologically important antifreeze, as a mixture of water and ammonia can have a melting point as low as 173 K if the ammonia concentration is high enough and thus allow such planets to retain internal oceans and active geology at a far lower temperature than would be possible with water alone.

Eris (dwarf planet)

Eris136199 Eris2003 UB313
Identified dwarf planets include the asteroid Ceres and the trans-Neptunian objects Pluto and Eris.
Eris (minor-planet designation 136199 Eris) is the most massive and second-largest (by volume) dwarf planet (and plutoid) in the known Solar System.

Moon

lunarthe MoonLuna
Six of the planets, at least four of the dwarf planets, and many of the smaller bodies are orbited by natural satellites, usually termed "moons" after the Moon.
It is the fifth-largest natural satellite in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits (its primary).

Ceres (dwarf planet)

Ceres1 Ceres Ceres
Identified dwarf planets include the asteroid Ceres and the trans-Neptunian objects Pluto and Eris.
It is the 33rd-largest known body in the Solar System.

Pluto

134340 Pluto(134340) Plutomass of Pluto
Identified dwarf planets include the asteroid Ceres and the trans-Neptunian objects Pluto and Eris.
Pluto is the largest and second-most-massive (after Eris) known dwarf planet in the Solar System, and the ninth-largest and tenth-most-massive known object directly orbiting the Sun.

Milky Way

galaxyMilky Way Galaxyour galaxy
The Solar System is located in the Orion Arm, 26,000 light-years from the center of the Milky Way galaxy.
The Milky Way is the galaxy that contains our Solar System.

Interplanetary dust cloud

interplanetary dustzodiacal cloudzodiacal dust
In addition to these two regions, various other small-body populations, including comets, centaurs and interplanetary dust clouds, freely travel between regions.
The interplanetary dust cloud, or zodiacal cloud, consists of cosmic dust (small particles floating in outer space) that pervades the space between planets within planetary systems such as the Solar System.

Ring system

planetary ringringsring
Each of the outer planets is encircled by planetary rings of dust and other small objects.
The most prominent and most famous planetary rings in the Solar System are those around Saturn, but the other three giant planets (Jupiter, Uranus, and Neptune) also have ring systems.

Universe

physical worldthe universeuniverses
Most people up to the Late Middle Ages–Renaissance believed Earth to be stationary at the centre of the universe and categorically different from the divine or ethereal objects that moved through the sky.
Over the centuries, more precise astronomical observations led Nicolaus Copernicus to develop the heliocentric model with the Sun at the centre of the Solar System.