At a Glance
Celestial Size Comparison
Choose the celestial objects you’re curious about. See at a glance how their sizes and environments compare.
Choose objects to compare
Choose at least 2 and no more than 4 celestial objects.
Solar System objects
16 objectsSunStar
MercuryPlanet
VenusPlanet
EarthPlanet
MoonMoon
MarsPlanet
CeresDwarf planet
JupiterPlanet
EuropaMoon
SaturnPlanet
EnceladusMoon
TitanMoon
UranusPlanet
NeptunePlanet
PlutoDwarf planet
67P/Churyumov–GerasimenkoComet
Size Comparison
Shows objects at a scale close to their actual size ratio.
Environment Comparison
Compare the size and environment of each celestial object.
| Measurement | Earth | Mars |
|---|---|---|
| Mean radius | ≈ 6,371 km | ≈ 3,389.5 km |
| Diameter | ≈ 12,742 km | ≈ 6,779 km |
| Spherical approximate volume | ≈ 1.083E12 km3 | ≈ 163,115,609,798.7 km3 |
| Mass | ≈ 5.972E24 kg | ≈ 6.417E23 kg |
| Mean density | ≈ 5,513.4 kg/m³ | ≈ 3,934 kg/m³ |
| Surface gravity | ≈ 9.807 m/s² | ≈ 3.71 m/s² |
| Escape velocity | ≈ 11.2 km/s | ≈ 5 km/s |
| Rotation period | ≈ 23.935 h | ≈ 24.623 h |
| Orbital period | ≈ 365.256 d | ≈ 686.98 d |
| Mean temperature | ≈ 288 K (14.9°C) | ≈ 210 K (-63.1°C) |
| Surface pressure | ≈ 101,325 Pa | ≈ 636 Pa |
| Orbital semi-major axis | ≈ 149,598,261.2 km | ≈ 227,943,822.4 km |
Mean radius
- Earth
- ≈ 6,371 km
- Mars
- ≈ 3,389.5 km
Diameter
- Earth
- ≈ 12,742 km
- Mars
- ≈ 6,779 km
Spherical approximate volume
- Earth
- ≈ 1.083E12 km3
- Mars
- ≈ 163,115,609,798.7 km3
Mass
- Earth
- ≈ 5.972E24 kg
- Mars
- ≈ 6.417E23 kg
Mean density
- Earth
- ≈ 5,513.4 kg/m³
- Mars
- ≈ 3,934 kg/m³
Surface gravity
- Earth
- ≈ 9.807 m/s²
- Mars
- ≈ 3.71 m/s²
Escape velocity
- Earth
- ≈ 11.2 km/s
- Mars
- ≈ 5 km/s
Rotation period
- Earth
- ≈ 23.935 h
- Mars
- ≈ 24.623 h
Orbital period
- Earth
- ≈ 365.256 d
- Mars
- ≈ 686.98 d
Mean temperature
- Earth
- ≈ 288 K (14.9°C)
- Mars
- ≈ 210 K (-63.1°C)
Surface pressure
- Earth
- ≈ 101,325 Pa
- Mars
- ≈ 636 Pa
Orbital semi-major axis
- Earth
- ≈ 149,598,261.2 km
- Mars
- ≈ 227,943,822.4 km
This comparison is based on the most reliable observational data available. Celestial information may change with new research and observations, so please treat it as a general guide rather than a definitive source.