Planetary Fact Sheet - Ratio to Earth Values

	MERCURY	VENUS	EARTH	MOON	MARS	JUPITER	SATURN	URANUS	NEPTUNE	PLUTO
Mass	0.0553	0.815	1	0.0123	0.107	317.8	95.2	14.5	17.1	0.0021
Diameter	0.383	0.949	1	0.2724	0.533	11.21	9.45	4.01	3.88	0.187
Density	0.984	0.951	1	0.605	0.713	0.240	0.125	0.230	0.297	0.317
Gravity	0.378	0.907	1	0.166	0.377	2.36	0.916	0.889	1.12	0.059
Escape Velocity	0.384	0.926	1	0.213	0.450	5.32	3.17	1.90	2.10	0.098
Rotation Period	58.8	-244	1	27.4	1.03	0.415	0.445	-0.720	0.673	6.41
Length of Day	175.9	116.8	1	29.5	1.03	0.414	0.444	0.718	0.671	6.39
Distance from Sun	0.387	0.723	1	0.00257*	1.52	5.20	9.58	19.20	30.05	39.24
Perihelion	0.313	0.731	1	0.00247*	1.41	5.03	9.20	18.64	30.22	30.15
Aphelion	0.459	0.716	1	0.00267*	1.64	5.37	9.96	19.75	29.89	48.02
Orbital Period	0.241	0.615	1	0.0748	1.88	11.9	29.4	83.7	163.7	248.0
Orbital Velocity	1.61	1.18	1	0.0344	0.810	0.439	0.325	0.229	0.182	0.158
Orbital Eccentricity	12.3	0.401	1	3.29	5.60	2.93	3.38	2.74	0.677	14.6
Axial Tilt	0.0004	0.113*	1	0.285	1.07	0.133	1.14	4.17*	1.21	2.45*
Surface Pressure	0	92	1	0	0.01	Unknown*	Unknown*	Unknown*	Unknown*	0
Number of Moons	0	0	1	0	2	61	33	26	13	1
Ring System?	No	No	No	No	No	Yes	Yes	Yes	Yes	No
Global Magnetic Field?	Yes	No	Yes	No	No	Yes	Yes	Yes	Yes	Unknown
	MERCURY	VENUS	EARTH	MOON	MARS	JUPITER	SATURN	URANUS	NEPTUNE	PLUTO

* - See the Fact Sheet Notes.

Planetary Fact Sheet in Metric Units
Planetary Fact Sheet in U.S. Units
Index of Planetary Fact Sheets - More detailed fact sheets for each planet
Notes on the Fact Sheet - Explanations of the values and headings in the fact sheet
Schoolyard Solar System - Demonstration scale model of the solar system for the classroom

NASA Official: Ed Grayzeck, edwin.j.grayzeck@nasa.gov
Last Updated: 01 September 2004, DRW