Object | Moon | Mars |
---|---|---|
Type | Rocky satellite | Rocky planet |
Age | 4.53 billion years | 4.6 billion years |
Diameter | 3,474 km | 6,779 km |
Mean radius | 1,737 km | 3,389 km |
Mass | 7.34 × 1022 kg | 6.39 × 1023 kg |
Orbital period | 27 days | 686 days |
Surface temperature (average) |
220 K -53 °C -63 °F |
210 K -63 °C -82 °F |
Surface gravity | 1.6 m/s² | 3.7 m/s² |
Mean density | 3.3 g/cm3 | 3.9 g/cm3 |
Orbital distance | 384,402 km | 230 million km |
Circumference | 10,921 km | 21,344 km |
Surface area | 37 million km² | 144 million km² |
Volume | 2.19 × 1010 km3 | 1.63 × 1011 km3 |
Escape velocity | 2.3 km/s | 5 km/s |
Average orbital speed | 1.02 km/s | 24 km/s |
Semi major axis | 384 thousands km | 227 million km |
Inclination | 5.1° | 1.8° |
Surface pressure | 10−7 Pa | 0.6 kPa |
Atmosphere composition | argon, helium, neon |
96% carbon dioxide, 1.9% argon, 1.9% nitrogen, 0.15% oxygen, 0.05% carbon monoxide, 0.02% water vapor, 0.01% nitrogen oxide |
Crust composition | 45% silica, 19% alumina, 14% lime, 10% iron, 2% titanium dioxide, 0.6% sodium oxide |
silica, calcium sulfate, iron, magnetite |
Distance from the Milky Way center | 27,200 light years | 27,200 light years |