List of planets

This is a list of two types of planets: standard planets and dwarf planets, in the Solar System.

 Planets in the Solar System 

 Terrestrial planets
Mercury – The planet with the second highest temperature in the Solar System and the closest planet to the Sun.
 Venus – The warmest planet. Sometimes called "Earth's twin" because Venus and Earth are very similar.
 Earth – The only planet that is known to have life. It has one natural satellite, the Moon.
 Mars – Sometimes called the "red planet" and "the brother of Earth".
 Giant planets
Jupiter – The largest planet in the Solar System.
 Saturn – Sixth planet from the Sun. It has giant rings around it.
 Uranus - Seventh planet from the Sun. It has 11 rings around it.
 Neptune – The farthest planet that we know from the Sun.

 Hypothetical planets 
 Vulcan – A hypothetical planet thought to be between the Sun and Mercury
 Theia – A planet which some think crashed into Earth and created the Moon.
 Planet V – A hypothetical planet beyond Mars.
 Phaeton – A planet which exploded and created Ceres.
 Antichthon – A hypothetical planet which has a opposite aspect of the Earth.
 Krypton – A hypothetical planet between Jupiter and Saturn
 Planet X – A planet beyond Neptune
 Tyche – a hypothetical planet thought to be found in the edges of the Oort Cloud.
 Planet Nine – a hypothetical planet beyond Neptune. It has not been found, but some astronomers think its gravity pulls on the orbits of many dwarf planets.  It is thought to be a gas giant.
 Planet 10 – A hypothetical planet beyond Neptune.

 Dwarf planets 
 Consensus 
 Ceres is the largest asteroid (not to mention plutinos) in the Solar System's main asteroid belt.
 Orcus crosses paths with the formal planet Pluto
 Haumea is shaped like an egg.
 Makemake crosses paths with Eris.
 Quaoar has two rings.
 Sedna has the largest orbital period, aphelion, semi-major axis and perihelion of any planet.
 Gonggong also crosses paths with Eris.
 Eris follows the most elliptical path of any planet.

 Dwarf planet candidates 

 Salacia
 Máni
 Aya
 Achlys
 Chiminigagua
 Varda
 Ixion
 Varuna
 G!kúnǁʼhòmdímà
 Chaos
 2014 UZ224 "Deedee"
 Dziewanna
 Uni
 2018 VG18 "Farout"
 2018 AG37 "Farfarout"
 2002 TC302
 2012 VP113 "Biden"
 Huya
 Hygiea
 1996 TL66
 1993 SB
 2002 TX300
 Lempo
 Sila-Nunam
 Altjira
 Praamzius
 Mbabamwanawaresa
 Ceto
 Leleākūhonua
 Deucalion
 2011 KT19

Exoplanets

Definition of a planet

Technically, there was never a scientific definition of the term planet before 2006. When the Greeks observed the sky thousands of years ago, they discovered objects that acted differently than stars. These points of light seemed to wander around the sky throughout the year. The term "planet" derives from the Greek word "planets" - wanderer.

In 2006, the International Astronomical Union (IAU) convened a Planet Definition Committee, deliberated, and ultimately reached a consensus on a new definition of a planet which leaves us with the eight planets we today consider to comprise the Solar System (thus the exit of Pluto).  That new definition: " A “planet” is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighborhood around its orbit [meaning: 'there are no other bodies in its path that it must sweep up as it goes around the Sun'.]"

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Category:Astronomy lists