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