Follow this link to skip to the main content National Aeronautics and Space Administration Logo
NASA Banner
NASA Mars Exploration Program
Mars Exploration Program
Home

MARS FACTS

Mars Facts

Mars & Earth Comparison
  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

USA.gov
PRIVACY     FAQ     SITEMAP     FEEDBACK     IMAGE POLICY