World:Enter the Grey/The Solar System/Mars
Partially terraformed, using large underwater oceans to recompose the atmosphere. Of all the colonies, Mars' main colony is the most directly connected to Earth via Luna. Current projections state that it will be possibly to set foot on the surface of Mars without a vacuum-suit in approximately two hundred years, barring unforseen disaster or technological leap. The lesson on terraforming too fast was learned from them disastrous attempt to repair Earth's nuclear-war-damaged atmosphere. In fact, many proponents of the Mars terraforming project point out that Mars' more stable tectonics will make the planet a safer place to live than Earth in the long-term.
What was originally a set of research stations has developed into a thriving colony. Almost 80% of Mars Prime's population are employed in some aspect of the terraforming process, the rest are largely family members of same.