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

	Mercury	Earth
Discovered By	Known by the Ancients	Known by the Ancients
Date of Discovery	Unknown	Unknown
Average Orbit Distance	57,909,227 km	149,598,262 km
Perihelion (closest)	46,001,009 km	147,098,291 km
Aphelion (farthest)	69,817,445 km	152,098,233 km
Equatorial Radius	2,439.7 km	6,371.00 km
Equatorial Circumference	15,329.1 km	40,030.2 km
Volume	60,827,208,742 km3	1,083,206,916,846 km3
Mass	330,104,000,000,000,000,000,000 kg	5,972,190,000,000,000,000,000,000 kg
Density	5.427 g/cm3	5.513 g/cm3
Surface Area	74,797,000 km2	510,064,472 km2
Equatorial Surface Gravity	3.7 m/s2	9.80665 m/s2
Escape Velocity	15,300 km/h	40,284 km/h
Rotation Period (Length of Day)	58.646 sidereal days	0.99726968 sidereal days
Orbit Period (Length of Year)	0.2408467 sidereal years	1.0000174 sidereal years
Mean Orbit Velocity	170,503 km/h	107,218 km/h
Orbit Eccentricity	0.20563593	0.01671123
Orbit Inclination to Ecliptic	7.0 degrees	0.00005 degrees
Equatorial Inclination to Orbit	0 degrees	23.4393 degrees
Orbit Circumference	359,976,856 km	939,887,974 km
Minimum/Maximum Surface Temperature	-173/427 °C	-88/58 (min/max) °C