SIZE IN DIAMETER - 6,700 km (4,200 mi)

LENGTH OF DAY - 24 1/2 hours

LENGTH OF YEAR - 687 earth days

TEMPERATURE HOT - 20 C (68 F)

TEMERATURE COLD - -70 (-94 F)

MOONS - 2

INTERESTING FACTS - has polar ice caps at both poles

FACT - people thought that canal-like lines on the surface was evidence of life

FACT - red in color, named for the Roman god of war

FACT - it is 140,000,000 miles from the sun