Mercury

Mercury is a planet in the Solar System. In Call of Duty: Infinite Warfare it has been settled by the UNSA, with China being the first nation to establish a facility on Mercury. Despite heat shielding being a prominent issue, the facility (of unknown purpose) was mainly automated with minimal life support for a human skeleton crew. Mercury is the smallest planet in the Sol System, and closest to the Sun. Its colonisation status is fairly recent; again, due to heat shielding issues

In-Game Planetary Bio
Distance from Sun: 0.47 AU (69.8 Million KM)

Day Length: 175.9 days

Year Length: 89 days

Temperature: -173°C to 427°C

Atmospheric Composition: Primarily Oxygen, Sodium and Hydrogen

Trivia

 * The asteroid Vesta-3 was in orbit of Mercury, and used as a refinery