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Mars has an equatorial circumference of 21,297 kilometers, which is about half a long as Earth's.

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Mars has a volume of 163,115,609,799 cubic kilometers. That makes second smallest planet, behind Mercury.

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If we put Mars on a balance, it would have a mass of 641,693,000,000,000,000,000,000 kilograms.

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Mars has a density of 3.9 grams / cubic centimeter. That makes it the least dense of the terrestrial planets.

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Mars has a gravitational pull of 3.7 meters / seconds squared. If we ever send astronauts to Mars, they will weight a lot less there.

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Rotation Period

It takes Mars 24.6 hours to complete a rotation, which is nearly the same as Earth.

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Revolution Period

Mars revolves around the Sun every 1.88 earth years. 

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Mars has a tilt of 25.2 degrees. This means it has seasons very similar to Earth.

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Mars has an average surface temperature of -63 degrees Celsius. This means it's probably just a little too cold for life.