
It also has a unique kind of atmosphere, where although solar winds are always blowing it away, they are also constantly replenishing it, through radioactive decay and micrometeors causing dust. It is also very closely the second densest planet with about 5.4g per cubic centimeter.
Its extreme closeness to our sun also makes this planet extremely challenging to study, however two probes have managed to visit mercury, including messenger (a nice reminder of the god for which mercury was named) and together those two probes have mapped out the surface.

This extremely small, fast moving planet is by far one of the more interesting as it has preserved the history of our solar system in its craters where various information on impacts may be found. It is also an oddity as planets go, even in our solar system. Making it seem all the truer that great things come in small packages.
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