Caractéristiques                       Mars                                  Terre
Diamètre équatorial                                6794 km                                    12 756 km
Diamètre polaire                                     6752 km                                          ?
Masse                                                 6,418.1023 kg                            59,75.1023 kg
Période de rotation                             24h 37 min 22,6 s                        23h 56 min 4 s
Période de révolution                             686,98 jours                                 365 jours
Inclinaison de l'équateur sur l'orbite                25°                                         23° 27 '
Inclinaison de l'orbite sur l'écliptique             1,51''                                            0°
Excentricité                                                0,0934                                       0,0167
Densité                                                    3,94gr/cm3                               5,52 gr/cm3
Pesanteur                                                  3,72 m/s2                                  9,81 m/s2
Vitesse de libération                                  5,0 km/s                                   11,18 km/s
Composition de l'atmosphère               CO2 (95,3 %),
                                                             azote (2,7%),
                                                           Argon (1,6%),
                                                        oxygène (0,13 %),
                                                      vapeur d'eau (0,03 %)
                                                                                                                Azote (78%),
                                                                                                                oxygène (21 %),
                                                                                                                 argon (0,9 %),
                                                                                                                 autres (0,1 %)
Température moyenne                             - 53 °C                                            + 22 ° C
Satellites                                 Phobos (27 km x 21,6 x 18,8)
                                              Deimos (15 km x 12,2 x 11)                Lune (3476 km de diamètre)