Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune	Pluto
Diameter (km)	4880	12,140	12,756	6787	142,800	120,000	51,800	49,500	6000
Mass (Earth =1)	0.055	0.815	1	0.108	317.8	95.2	14.4	17.2	0.003
Density (g/cm^3)	5.44	5.2	5.52	3.93	1.3	0.69	1.28	1.64	2.06
Number of moons	0	0	1	2	16	18	15	8	1
Length of day (Earth hours)	1416	5832	24	24.6	9.8	10.2	17.2	16.1	154
Solar revolution (Earth yrs)	0.24	0.62	1.00	1.88	11.86	29.5	84.0	164.9	247.7
Avg. Distance from Sun (10^6 km)	58	108	150	228	778	1427	2870	4497	5900
Solar Constant (watts/m^2)	3566	2660	1370	595	51	15	3.71	1.47	0.9

Terrestrial Planets = Mercury, Venus, Earth, Mars

• closest to Sun

• few Moons

• small diameter

• thin atmoshpere

• high density interior

• composed principally of iron, oxygen, silica, magnesium

Asteroid Belt separates terrestrial from Jovian Planets

Jovian Planets = Jupiter, Saturn, Uranus, Neptune, Pluto

• far from Sun

• many moons

• large diameter

• thick atmosphere

• low density interior