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Mercury has an equatorial circumference of 15,329 kilometers. That's only a little bigger than Earth's moon. 

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Mercury has a volume of 60,827,208,742 cubic kilometers. That might seem like a big number, but it's smaller than all of the other planets.

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If we put Mercury on a balance, it would have a mass of 330,104,000,000,000,000,000,000 kilograms.

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Being a terrestrial planet, Mercury has a relatively high density of 5.42 grams / cubic centimeters. It would definitely sink in water.

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Because of it's low mass, Mercury has a gravitational pull of only 3.7 meters / seconds squared. This is less than half of Earth's gravitational pull.

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Rotation Period

It takes Mercury 1,407.5 hours to complete one rotation. That's almost two months!

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Revolution Period

Because it is closest to the Sun, Mercury orbit is relatively short and it's able to complete a revolution in 0.24 earth years.

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Mercury has an axial tilt of 0 degrees. That means it has no tilt at all and experiences no seasonal changes.

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Mercury's temperatures change wildly between day and night. It's average temperature is 66.9 degrees Celsius. That's too hot for humans to survive.