Mars Day! is an annual National Air and Space Museum event that celebrates the Red Planet
| Earth | Mars | |
| Average Distance from Sun | 93 million miles | 142 million miles |
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| Average Speed in Orbiting Sun | 18.5 miles per second | 14.5 miles per second |
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| Diameter | 7,926 miles | 4,220 miles |
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| Tilt of Axis | 23.5 degrees | 25 degrees |
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| Length of Year | 365.25 Days | 687 Earth Days |
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| Length of Day | 23 hours 56 minutes | 24 hours 37 minutes |
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| Gravity | 2.66 times that of Mars | 0.375 that of Earth |
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| Temperature | Average 57 degrees F | Average -81 degrees F |
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| Atmosphere | nitrogen, oxygen, argon, others | mostly carbon dioxide, some water vapor |
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| Number of Moons | 1 | 2 |
