The Planets

The table below shows certain facts about each planet.

Planet	Distance from the sun (km)	Diameter (km)	Period of evolution(Earth days)	Period of rotation (Earth days)	Number of known moons
Mercury	57 million	4,879	88 days	58.65 days	0
Venus	108 million	12,104	224.7 days	243	0
Earth	150 million	12,756	365¼ days	24 hours	1
Mars	228 million	6,794	687 days	24 hours 37 minutes	2
Jupiter	779 million	142,984	12 years	9 hours 55 minutes	62
Saturn	1,427 million	121,536	29½ years	10 hours 40 minutes	62
Uranus	2,871 million	51,118	84 years	17 hours 14 minutes	27
Neptune	4,498 million	49,528	165 years	19 hours 17 minutes	13

The planets are classified into two groups: the inner or terrestrial planets (Mercury, Venus, Earth, and Mars) and the outer or gas giant planets (Jupiter, Saturn, Uranus, and Neptune).