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

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

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