Recognised as Moon
The Moon
- Moon
- 0.17× Earth gravity
- Orbits Earth
The Moon is a moon with a mean radius of 1,737 km and a surface gravity of 1.62 m/s², which is 0.17× Earth's, so a 70 kg person would weigh 11.6 kg there. Escape velocity is 2.38 km/s. It is tidally locked, so the rotation and orbital periods match.
Physical properties
Mass0.0734 × 10²⁴ kg≈measured
Mean radius1,737 km≈
Circumference10,916 km
Surface area37,932,328 km²
Volume21.9679 × 10⁹ km³one cubic kilometre is 10⁹ cubic metres
Mean density3,342 kg/m³water is 1,000 kg/m³
Gravity and escape
Surface gravity1.623 m/s²0.165× Earth's
Escape velocity2.375 km/sthe speed needed to leave without further propulsion
A 70 kg person would weigh11.6 kg-forcemass is unchanged; only the weight differs
A 1 kg mass would weigh1.623 newtons
Fall in 1 second0.812 mfrom rest, ignoring any atmosphere
Rotation and orbit
Day length (sidereal)27.322 Earth days
Orbital period27.322 Earth days
OrbitsEarth
KindMoon
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