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9-12 > Astronomy/Space Science

Earth and Beyond
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Comparing Earth to Mars Answer Key


Mars
Mars
Earth
Earth
Rotational period 24.6 hours 23 hours
56 minutes
Length of “year” 687 days 365.25 days
Mean distance from the sun 141.7 million miles
(1.5 AU)		 93 million miles
(1 AU)
Atmosphere (top three chemicals by %) 1. Carbon Dioxide (95.3%)
2. Nitrogen (2.7%)
3. Argon (1.6%)		 1. Nitrogen (78%)
2. Oxygen (21%)
3. Argon (0.9%)
Atmospheric pressure
 0.007 bar
 1 bar at sea level
Highest elevation; largest mountain About 51,200 feet (9.7 miles),
Olympus Mons;
Olympus Mons		 29,028 feet
(5.5 miles),
Mt. Everest;
Mauna Kea (33,465 feet from sea floor)


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