Mercury has a diameter of 4,880 km. but its mass is almost half that of Mars, which indicates that its density is very high. The measurements indicate a density completely analogous to the terrestrial, suggesting a high percentage of iron in the planet's interior composition.
As a consequence of the high mass of the planet, gravity on its surface is comparable to that of Mars. Its extreme proximity to the Sun and the fact that, in practice, it does not have an atmosphere (one that has been measured at ground level is a trillion times lower than the earth) makes this hellish world experience the highest variations existing thermal on a planet. Under these conditions scientists exclude that the planet can house any form of life.
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