List of planets
Encyclopedia
In the Solar System
According to current definitions, there are eight planetPlanet
A planet is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.The term planet is ancient, with ties to history, science,...
s in the Solar System
Solar System
The Solar System consists of the Sun and the astronomical objects gravitationally bound in orbit around it, all of which formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago. The vast majority of the system's mass is in the Sun...
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Dwarf planets
The Solar System also contains five identified dwarf planetDwarf planet
A dwarf planet, as defined by the International Astronomical Union , is a celestial body orbiting the Sun that is massive enough to be spherical as a result of its own gravity but has not cleared its neighboring region of planetesimals and is not a satellite...
s, which are not considered planets:
- Ceres
- Pluto
- Makemake
- Haumea
- ErisEris (dwarf planet)Eris, formal designation 136199 Eris, is the most massive known dwarf planet in the Solar System and the ninth most massive body known to orbit the Sun directly...
- For a complete list of all known spherical objects in the Solar System (including planets, dwarf planets, moons and the Sun), together with their physical and orbital properties, see: List of gravitationally rounded objects of the Solar System
- For a list of objects in our Solar System that have been or are believed to exist, but either have not been proven or have been disproven, see: List of hypothetical Solar System objects
Orbiting other stars
- For a list of planets orbiting other stars, see: List of extrasolar planets
- For a list of extrasolar planets which have yet to be confirmed or have been disproven, see: List of unconfirmed extrasolar planets
Fictional or non-scientific planets
- For a list of supposed planets not based on scientific evidence, see: Planetary objects proposed in religion, astrology, ufology and pseudoscience
- For a list of planets in fiction see: Planets in science fictionPlanets in science fictionPlanets in science fiction are fictional planets that appear in various media, especially those of the science fiction genre, as story-settings or depicted locations.-History:...
- For a list of fictional planets within the Solar System, see: Fictional planets of the Solar System
See also
- List of planetary systems