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Mercury is the smallest planet out of all the nine planets in the solar system.

Mercury is mostly made out of Oxygen,the rest of it is made out of other various gases such as Sodium,Hydrogen,Helium and Potassium.It is very small compared to Earth.It 's 0.056 part of Earth.It takes about 58 days to rotate around the Sun.Mercury's image is very similar to the moon.it is also the closest planet to the Sun.