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Earth
Mars

Mars and its two moons, Phobos and Deimos (not shown to scale). Since Mars is quite a bit smaller than the Earth, its gravitational pull is less. If you weigh 100 pounds on Earth, you would only weigh 38 pounds on Mars!

Length of Day 23 Hours and 56 minutes 24 Hours and 34 minutes
Length of Year 365 Days 687 Days
Circumference 24,900 Miles 13,260 Miles
Average Distance from the Sun 93 million miles 141.6 million miles
Average Surface Temperature 48°F -63°F
Atmosphere Mostly Nitrogen and Oxygen Mostly Carbon Dioxide with some Nitrogen. Less than 1% of the atmospheric pressure of the Earth!
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