Fact File
Distance from the Sun: 1.52 AU
Sidereal revolution period (about Sun): 687 days
Mass (Earth=1): .11
Radius at equator (Earth=1): 0.53
Apparent size: 4-25 arc seconds
Sidereal rotation period (at equator): 24.6 hours
Moons: 2

Tidbits: Mars has few craters, and has fierce windstorms. At the southern pole, there is a small cap of water and carbon dioxide ices and there is also a volcano (Olympus Mons) larger than any mountain on Earth.