Mars is the first planet outside the Earth's orbit, with a year 1.88 Earth years long. It has a very thin carbon dioxide atmosphere, and a mean surface temperature of a chilly -63°C.

- Vital statistics:
- Mass: 6.4 x 10
^{23}kg = 0.107 Earths/8.8 Moons - Diameter: 6779 km = 0.53 Earth's
- Density: 3.93 tonnes/m
^{3}= 0.713 Earth's density - Surface gravity: 3.7 m/s
^{2}= 0.38g - Distance from Sun: 207 - 249 million km (227.9 Mkm semi-major axis) = 1.38 - 1.67 AU (Earth-Sun distances)
- Period of orbit: 687.0 Earth days / 1.88 Julian years
- Period of rotation: 1.03 Earth days (24.62 h)
- No. of moons: 2
- Atmosphere: 0.64 kPa (0.63% Earth's atmosphere), 96.0% CO
_{2}, 1.9% argon, 1.9% nitrogen, 0.15% O_{2}, and trace gases, including 210 ppm (parts per million) water vapour.

Mars has two natural satellites, the small moons Phobos and Deimos.

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