Mercury, the smallest planet in the Solar System
Type Homeworld
Affiliation Homeworld Congress
Status Liberated
Places of Interest
Infrastructure Mercury Outpost
Mercury is the smallest planet of the terrestrial planets, or Homeworlds, and the only planet yet to be terraformed.


Mercury is the closest planet to the Sun, orbiting it every 88 Earth days and a single day on Mercury lasts exactly two Mercury years, or about 176 Earth days. The planet is named after the Roman god Mercury, the messenger to the gods. Mercury is smaller than the largest Moons in the Solar System, Ganymede and Titan.

Mercury’s surface is very similar in appearance to that of the Moon, showing extensive mare-like plains and heavy cratering, indicating that it has been geologically inactive for billions of years. There are two geologically distinct plains regions on Mercury. Gently rolling, hilly plains in the regions between craters are Mercury's oldest visible surfaces, predating the heavily cratered terrain.


It is inhabited by humans; though only to a limited degree of scientific outposts due to the Outer Space Treaty of 1967. Though Mercury served little strategic importance and was not rich in resources, it was conquered by the Neosapien Commonwealth during Operation Destiny of the Neosapien War in 2119 A.D. as an exclamation point on the Neosapien Order’s complete dominance over the Homeworlds. A Neosapien outpost was maintained throughout the war until 2121 A.D. when Exofleet and the Pirate Clans captured Mercury for use as a base of operations to liberate Venus.