The only moon of Venus.
Once the first planet of the Sol System and a former hot S-Class world, this now temperate E-Class world was moved out of its orbit in 2321 to help in the terraforming of Venus. This caught the attention of a couple massive corporations back on Earth who sent out teams of their own to begin terraforming procedures on Mercury as well. Terraforming began in 2335.
As of 10000 the moon has a mean temperature of 26.1 °C (79 °F), an orbital period of 1.8 days, a semimajor axis of 59839.2 km (37182.4 mi) and a day length nearly identical to that of its parent planet Venus. Its atmospheric pressure is the same as Venus'. After the moon’s new orbit around Venus has been stabilized at 59839.2 km (37182.4 mi) from Venus, the two teams of scientists began to terraform the lifeless world.
Gases mined from some of the outer gas giants and moons were imported to help the very thin atmosphere grow. Over the next two hundred years small plants and animals were slowly introduced and by 2613 the moon had been completely terraformed.
As with Venus, some of the ancestors of the now 1.4 billion inhabitants of Mercury came from the equatorial regions of Earth, but surprisingly most came from Venus. Mercurians, while having darker skin like Venusians, are also taller and weaker due to the weak gravitational pull of the planet. Also because of the weaker pull, many inhabitants have opted for genetic engineering and have implanted wings onto their person, letting them fly around.
Unlike Venus, Mercury is about twenty degrees cooler than its parent planet, making it more like Earth. The trees and animals there are also much taller than their Venusian parents.
The atmospheric pressure is currently 0,9 atmospheres.