Wiktionary Appendix:Planets

The planets of the solar system are those nine bodies traditionally labelled as such: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.

An ever growing list of planets around other stars can be found in The Extra-Solar Planets Catalog or California & Carnegie Planet Search.

Other classes of objects not considered major planets are found in the Asteroid Belt , Kuiper Belt, and Oört Cloud .

Attributes of Major Planets

All attributes below are measured relative to the Earth:

Planet	Equatorial diameter	Mass	Orbital Radius	Year	Day
Mercury	0.382	0.06	0.38	0.241	58.6
Venus	0.949	0.82	0.72	0.615	-243
Earth	1.00	1.00	1.00	1.00	1.00
Mars	0.53	0.11	1.52	1.88	1.03
Jupiter	11.2	318	5.20	11.86	0.414
Saturn	9.41	95	9.54	29.46	0.426
Uranus	3.98	14.6	19.22	84.01	0.718
Neptune	3.81	17.2	30.06	164.79	0.671
Pluto*	0.24	0.0017	39.5	248.5	6.5
Sedna	0.1	0.001	90	11487	32

^*Soon after its discovery in 1930, Pluto was classified a planet by the International Astronomical Union. However, based on additional discoveries since that time, some astronomers have suggested Pluto should be classified as a Kuiper Belt object.

External links

• Wikipedia article on the solar system
• The Nine Planets