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Mars size compared to Earth
Size of the planet Mars, compared to that of the Earth.
Note: if one of the objects is not visible, it just means that it is too tiny to be displayed compared to the other one.
| Object | Mars | Earth |
|---|---|---|
| Type | Rocky planet | Rocky planet |
| Age | 4.6 billion years | 4.54 billion years |
| Population | 0 | 7.7 billion |
| Diameter | 6,779 km | 12,742 km |
| Mean radius | 3,389 km | 6,371 km |
| Mass | 6.39 × 1023 kg | 5.97 × 1024 kg |
| Orbital period | 686 days | 365 days |
| Rotation duration | 24 hours | 24 hours |
| Surface temperature (average) |
210 K -63 °C -82 °F |
288 K 14.9 °C 58.7 °F |
| Surface gravity | 3.7 m/s² | 9.8 m/s² |
| Mean density | 3.9 g/cm3 | 5.5 g/cm3 |
| Orbital distance | 230 million km | 150 million km |
| Circumference | 21,344 km | 40,075 km |
| Surface area | 144 million km² | 510 million km² |
| Volume | 1.63 × 1011 km3 | 1.08 × 1012 km3 |
| Escape velocity | 5 km/s | 11.1 km/s |
| Average orbital speed | 24 km/s | 29.78 km/s |
| Aphelion | 249 million km | 152 million km |
| Perihelion | 206 million km | 147 million km |
| Semi major axis | 227 million km | 149 million km |
| Inclination | 1.8° | 7.1° |
| Satellites | 2 natural satellites 0 quasi-satellite 7 artificial satellites |
1 natural satellite 5 quasi-satellites 1,800 artificial satellites |
| Surface pressure | 0.6 kPa | 101.3 kPa |
| 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 |
78% nitrogen (N2), 21% oxygen (O2), ~ 1% water vapor, 0.9% argon, 0.04% carbon dioxide |
| Crust composition | silica, calcium sulfate, iron, magnetite |
60% silica, 16% alumina, 6% lime, 6% iron oxide, 4% magnesia, 3% sodium oxide, 2% potassium oxide |
| Distance from the Milky Way center | 27,200 light years | 27,200 light years |
Note: if one of the objects is not visible, it just means that it is too tiny to be displayed compared to the other one.
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