cid 5ef459efea8174030001f0014548308277a4bfda512b13b0b92354a0cccfebe2 · original · open access · via wikipedia
Title: Dwarf planet Authors: Venue: Wikipedia Year: unknown Canonical: wiki:dwarf-planet URL: https://en.wikipedia.org/wiki/Dwarf_planet Collector: wikipedia OA: true ABSTRACT A dwarf planet is a small planetary-mass object that is in direct orbit around the Sun, massive enough to be gravitationally rounded, but insufficient to achieve orbital dominance like the eight classical planets of the Solar System. The prototypical dwarf planet is Pluto, which for decades was regarded as a planet before the "dwarf" concept was adopted in 2006. Many planetary geologists consider dwarf planets and planetary-mass moons to be planets, but since 2006 the IAU and many astronomers have excluded them from the roster of planets.