Alien Species


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Universe Actual Universe
System Sol System
Orbital Position 1
Moons None
Class Terrestrial
Gravity 0.38 g (3.7 m/s²)
Atmosphere Traces only
Climate Barren
Diameter 4879.4 km
Primary Terrain Rocky deserts, craters
Surface water Water-ice in polar craters
Notable Species Mercurians
Rotation period 58.6 Earth days
Orbital Period 88 Earth days
Mercury is the innermost planet of the Sol System. A small, rocky desert world filled with craters and nearly devoid of atmosphere of any sort. It has no moon. It was once believed to have a solidified core and to be tidally-locked to the sun, but these notions have been disproved since (Most of the interior of the planet is molten and it is not tidally locked).

Because of its proximity to its parent star and near absence of liquids or gases, Mercury's surface undergoes extreme temperature variations between day and night and is currently considered an unlikely location for life. Compared to Venusians, Martians or even Jovians; Mercurians are a rarity in science fiction and are typically described as rather simple lifeforms, one exception being the humanoid Mercurians from DC.

Mercury is the planet closest to the Sun.

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