Mercury is the smallest planet in the Solar System. It is smaller in diameter even that two moons, Ganymede and Titan, although it is heavier than them. This is because its high density similar of that of Earth but uncompressed. Mercury is sometimes considered a iron planet, because the iron core occupies most of the planet volume. Once was though that Mercury was tidal locked with the Sun, like the Moon is with Earth, always facing the same face to the parent body, but now it is known that it is has a 3:2 syncronism between its rotation and the orbit arround the Sun.
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