![]() The term planet is ancient, with ties to history, astrology, science, mythology and religion. Bodies meeting the geological definition are sometimes called "planetary-mass objects" or "planemos" for short. In addition to the eight Solar planets accepted by the IAU, these include dwarf planets such as Eris and Pluto and planetary-mass moons. In the geological definition used by most planetologists, a planet is a rounded sub-stellar body, possibly a satellite. The IAU has also declared that there are eight planets in the Solar System, independently of the formal definition. In the dynamicist definition adopted by the International Astronomical Union (IAU), a planet is a non-stellar body that is massive enough to be rounded by its own gravity, that directly orbits a star, and that has cleared its orbital zone of competing objects. There are competing scientific definitions of a "planet". Sizes are not to scale.Ī planet is a large astronomical body that is neither a star nor a stellar remnant. Shown in order from the Sun and in true color. Jupiter and Saturn ( gas giants) Uranus and Neptune ( ice giants) The eight known planets of the Solar System, according to the IAU definition: For other uses, see Planet (disambiguation). For planets in astrology, see Planets in astrology. This article is about the astronomical object.
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