Mars

Basic Data:
Sidereal Period: 686.98 daya
Rotation Period: 24h 37
Mean Surface Temperature: -23deg C.
Diameter: 6794 km (4222 miles)

Mars named after the god of war, is the fourth plnet from the sun. It has huge volcanos, the largest of which is Olympus Mons, 15 miles high. There is also a huge valley, Valles Marineris, 2800 miles long.