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	149,598,262 km	227,943,824 km
Perihelion (closest)	147,098,291 km	206,655,215 km
Aphelion (farthest)	152,098,233 km	249,232,432 km
Equatorial Radius	6,371.00 km	3,389.5 km
Equatorial Circumference	40,030.2 km	21,296.9 km
Volume	1,083,206,916,846 km3	163,115,609,799 km3
Mass	5,972,190,000,000,000,000,000,000 kg	641,693,000,000,000,000,000,000 kg
Density	5.513 g/cm3	3.934 g/cm3
Surface Area	510,064,472 km2	144,371,391 km2
Equatorial Surface Gravity	9.80665 m/s2	3.71 m/s2
Escape Velocity	40,284 km/h	18,108 km/h
Rotation Period (Length of Day)	0.99726968 sidereal days	1.026 sidereal days
Orbit Period (Length of Year)	1.0000174 sidereal years	1.8808476 sidereal years
Mean Orbit Velocity	107,218 km/h	86,677 km/h
Orbit Eccentricity	0.01671123	0.0933941
Orbit Inclination to Ecliptic	0.00005 degrees	1.85 degrees
Equatorial Inclination to Orbit	23.4393 degrees	25.2
Orbit Circumference	939,887,974 km	1,429,085,052 km
Minimum/Maximum Surface Temperature	-88/58 (min/max) °C	-87 to -5 °C
Atmospheric Constituents	Nitrogen, Oxygen	Carbon Dioxide, Nitrogen, Argon