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The Swiftest Planet
Sun-scorched Mercury is only slightly larger than Earth's moon. Like the moon, Mercury has very little atmosphere to stop impacts, and it is covered with craters. Mercury's dayside is super-heated by the sun, but at night temperatures drop hundreds of degrees below freezing. Ice may even exist in craters. Mercury's egg-shaped orbit takes it around the sun every 88 days.

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  All About Mercury Moons Facts & Figures Mercury vs. ... Missions FAQ

Comparison: Mercury vs. Earth

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.

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

 

New planets/moons to compare:

System of measurement:

Compare All Eight Planets

Comparison: Mercury vs. Earth

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.

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

 

New planets/moons to compare:

System of measurement:

Compare All Eight Planets