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To MARS with MER - MARS the Planet

The Red Planet

Revolution

Rotation

686.98 Earth days

1.025957 Earth days

Mass

Density

0.64191 x 1027 grams

3.94 gm/cm3

Atmosphere

Craters

carbon dioxide, nitrogen and argon

northern hemisphere has fewer than the southern hemisphere

Radius

Distance From the Sun

3,397 km

227,936,640 km

Surface Temperature

Moons

27 to -133 C

two: Phobos and Deimos

Volcanoes

Water

Olympus Mons is the largest volcano in the solar system

Once certainly had plentiful liquid water, revealed by the winding channels images by Viking. Images from the Mars Global Surveyor Spacecraft even raise the possibility of much more recent flows of liquid water. Thought the evidence is, as yet, unproven.

WANT TO LEARN MORE?
Mission Links:
 • Athena Mars Exploration Rovers
 • NASA Mars Exploration Rovers
 • 2001 Mars Odyssey
 • Mars Express
 • Mars Global Surveyor
 • Mars Pathfinder
 • Viking Project
 • Mariner
Websites:
 • Mars Rover Surprises Continue; Spirit, Too, Finds Hematite
 • Mars Rover Finds Rock Resembling Meteorites That Fell to Earth
 • Opportunity Rover Finds Strong Evidence Meridiani Planum Was Wet
 • Mars Rover Pictures Raise 'Blueberry Muffin' Questions
 • NASA's Mars Odyssey Changes Views about Red Planet
 • Scientists Say Mars Has a Liquid Iron Core
 • Snow Gullies on Mars
 • Mars Quick Facts
Additional Links:
 • Mars Exploration Homepage
 • JPL's Solar System Exploration
 • The Nine Planets
 • Views of the Solar System
 • Windows to the Universe
The Red Planet    1     2     3     4     5