Journey Into Space: Gravity, Orbits, and Collisions
Space Astronomy and Space
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Diameter: 4,200 miles across
Location: 4th planet from Sun
Distance from Sun: About 142 million miles
Number of Moons: 2
Average Surface Temperature: Summer 32 Fahrenheit; Winter -150 Fahrenheit
Orbital Period: 687 Earth days
Characteristics: The atmosphere is made up of three gases: carbon dioxide, nitrogen, and argon.
Identity in Mythology: Mars, the Roman god of war

(Image: Grolier Interactive)
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