This chart shows the differences between Earth and Mars. To change the planets/moons being compared, change one or more of the form fields at the bottom and click Refresh.

	Earth	Mars
Discovered By	Known by the Ancients	Known by the Ancients
Date of Discovery	Unknown	Unknown
Average Orbit Distance	149,597,890 km	227,936,640 km
Perihelion (closest)	147,100,000 km	206,600,000 km
Aphelion (farthest)	152,100,000 km	249,200,000 km
Equatorial Radius	6,378.14 km	3,397 km
Equatorial Circumference	40,075 km	21,344 km
Volume	1,083,200,000,000 km3	163,140,000,000 km3
Mass	5,973,700,000,000,000,000,000,000 kg	641,850,000,000,000,000,000,000 kg
Density	5.515 g/cm3	3.94 g/cm3
Surface Area	510,065,700 km2	144,100,000 km2
Equatorial Surface Gravity	9.766 m/s2	3.693 m/s2
Escape Velocity	40,248 km/h	18,072 km/h
Rotation Period (Length of Day)	0.99726968 sidereal days	1.026 sidereal days
Orbit Period (Length of Year)	1.0000174 sidereal years	1.8807 sidereal years
Mean Orbit Velocity	107,229 km/h	86,871 km/h
Orbit Eccentricity	0.01671022	.0934
Orbital Inclination to Ecliptic	0.00005 degrees	1.8 degrees
Equatorial Inclination to Orbit	23.45 degrees	25.19
Orbital Circumference	924,375,700 km	1,366,900,000 km
Minimum/Maximum Surface Temperature	-88/58 (min/max) °C	-87 to -5 °C
Atmospheric Constituents	Nitrogen, Oxygen	Carbon Dioxide, Nitrogen, Argon

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