Mercury and Moon
Mercury (planet) and Moon (Earth’s natural satellite) side by side – to scale and in numbers.
| Mercury | Moon | Mercury ÷ Moon | |
|---|---|---|---|
| Diameter | 4,879 km | 3,475 km | 1.40 × |
| Mass | 3.30 × 10²³ kg | 7.30 × 10²² kg | 4.52 × |
| Surface gravity | 3.70 m/s² | 1.60 m/s² | 2.31 × |
| Density | 5,429 kg/m³ | 3,340 kg/m³ | 1.63 × |
| Mean temperature | 167 °C | -20 °C | |
| Mean distance from the Sun | 57.90 million km | 149.6 million km with Earth |
0.39 × |
| Length of day | 175.9 days | 29.5 days sunrise to sunrise |
5.96 × |
| Year (orbit around the Sun) | 88.0 days | 365.2 days (1.00 years) with Earth |
0.24 × |
| Orbit around its planet | – | 27.3 days around Earth |
|
| Known moons | 0 | – |
Data: NASA Planetary Fact Sheet, JPL SSD (planetary moons), JPL SBDB (dwarf planets) – public domain. Moon gravity is calculated from the JPL mass (GM) and radius; a moon’s “year” is its planet’s orbit around the Sun. A dash – no value in these sources.
⇄ Swap sides More about Mercury More about Moon