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Planet Mars Facts

Mars/Earth Comparison:
  Mars Earth
Average Distance from Sun 142 million miles 93 million miles
Average Speed in Orbiting Sun 14.5 miles per second 18.5 miles per second
Diameter 4,220 miles 7,926 miles
Tilt of Axis 25 degrees 23.5 degrees
Length of Year 687 Earth Days 365.25 Days
Length of Day 24 hours 37 minutes 23 hours 56 minutes
Gravity .375 that of Earth 2.66 times that of Mars
Temperature Average -81 degrees F Average 57 degrees F
Atmosphere mostly carbon dioxide some water vapor nitrogen, oxygen, argon, others
# of Moons 2 1

More Information on Mars:

Link to 'Mars in the Solar System' Mars in the Solar System How does Mars measure up against the other planets?
Link to 'Martian Moons' Martian Moons: The diabolical duo: Phobos & Deimos.
Link to 'Martian Seasons' Martian Seasons What's the weather like?
Link to 'Mars Atlas' Mars Atlas: Find your way around the Red Planet.
Link to 'All About Mars' All About Mars Learn more about Mars' extreme environment, pop culture Mars and Mars in the night sky.