A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary disk.

In the Solar System

Solar System

Objects
by orbit by size by discovery date models
Lists
Gravitationally rounded (equilibrium) objects Possible dwarf planets Moons (natural satellites) Planetary-mass moons Minor planets Comets Asteroids
Planets
Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
Solar System portal  Star portal
v t e

• For a list of geophysical planets in the Solar System, see: List of gravitationally rounded objects of the Solar System This also includes a list of the eight planets according to the IAU definition.
• For a list of objects in the Solar System once but no longer generally considered planets, see: List of former planets
• For a list of objects in the Solar System, including planets, 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

Outside the Solar System

Exoplanets

• • by year of discovery (pre-2000
  • 2000-2009
  • 2010
  • 2011
  • 2012
  • 2013
  • 2014
  • 2015
  • 2016
  • 2017
  • 2018
  • 2019
  • 2020
  • 2021
  • 2022
  • 2023)
• List of nearest exoplanets
• List of proper names of exoplanets

Extrasolar systems

• List of multiplanetary systems
• List of exoplanets discovered using the Kepler space telescope
• List of stars with proplyds
• List of rogue planets

Exoplanets by method of detection

• List of exoplanets detected by radial velocity
• List of transiting exoplanets
• List of exoplanets detected by microlensing
• List of directly imaged exoplanets
• List of exoplanets detected by timing

Records in exoplanet detection

• List of exoplanet extremes
• List of exoplanet firsts

Potential terrestrial exoplanets

• List of nearest terrestrial exoplanet candidates
• List of potentially habitable exoplanets

Fictional or non-scientific planets

• For a list of planets as used in astrology, see: Planets in astrology
• 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 fiction, Stars and planetary systems in fiction and Fictional planets of the Solar System

Mixed

• List of planet types (etymologically accepting of multiple categories)