Quick Facts

	Earth	Mars
Average Distance from Sun	93 million miles	142 million miles

Average Speed in Orbiting Sun	18.5 miles per second	14.5 miles per second

Diameter	7,926 miles	4,220 miles

Tilt of Axis	23.5 degrees	25 degrees

Length of Year	365.25 Days	687 Earth Days

Length of Day	23 hours 56 minutes	24 hours 37 minutes

Gravity	2.66 times that of Mars	0.375 that of Earth

Temperature	Average 57 degrees F	Average -81 degrees F

Atmosphere	nitrogen, oxygen, argon, others	mostly carbon dioxide, some water vapor

Number of Moons	1	2

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