Overview
Science
Technology
Missions
People
Mars Facts
Mars: Extreme Planet
Pop Culture Mars
Mars in our Night Sky
Newsroom
Images
Videos
Mars 3D Images
Interactives
Mars As Art
Resources
Webcast Archives
Mars for Everyone
Mars for Educators
Mars for Students
Mars for Kids
Postcard
Type your search term to find more information
All About Mars
>
Mars: Extreme Planet
>
Quick Facts
ALL ABOUT MARS
MARS FACTS
|
MARS: EXTREME PLANET
|
POP CULTURE MARS
|
MARS IN OUR NIGHT SKY
Summary
Quick Facts
Martian Moons
Martian Year
Quick Facts
Quick Facts
Detailed Facts
Picture 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