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Mercury's rotation period is 59 Earth days. Mercury is an inner planet that is also the closest to the sun. Mercury is a small planet with an equatorial diameter of 4,879 kilometers. Mercury's gravity is 38 percent that of the Earth's. Mercury does not have moons associated with it. However, it does have many craters as the result of collisions from asteroids and comets.
Color image of Mercury. Image credit: NASA. Mercury is the smallest planet in the Solar System and orbits the Sun every 87.969 Earth days. At this time it does not have a moon, but some scientists speculate that it may have had a moon in the ancient past.It is their contention that the orbit of Mercuryâs moon decayed and it impacted the surface of the planet.olor image of Mercury. Image credit: NASA. Mercury is the smallest planet in the Solar System and orbits the Sun every 87.969 Earth days. At this time it does not have a moon, but some scientists speculate that it may have had a moon in the ancient past.