Earth

Earth
Earth as seen by Apollo 17, December 1972
Star, Position	Sol, III
Moon(s)	1 (Luna)
Artificial satellite(s)	Von Braun Station
Diameter	12,742 km
Length of day	~24 hours
Length of year	365.2425 days
Surface gravity	1 g
Atmosphere composition	78.08% nitrogen (N2) (dry air) 20.95% oxygen (O2) 0.930% argon 0.039% carbon dioxide ~ 1% water vapor (climate-variable)
Mean temperature	15.0 °C (59°F)
Adjective	Terran
Population	9,749,000,000 (before 2295) 490,000 (2295)
Government	North Atlantic Conglomerate United Republics of Bharat Technocratic State of Argentina Holy Arab League New Russian Republic Russian Federation Republic of Fiji

Earth, also referred to as Terra, is the third planet from Sol and the first celestial body to have been known to harbor life. It is the planet of origin of humans, who have since colonised dozens of other star systems. For centuries it was the cultural and political center of the Orion Arm, despite being slowly running out of resources and suffering from overpopulation. Earth was partially destroyed during World War III, which led to a rise of sea levels by around 100 meters. It was later completely destroyed during the Great Orion War in 2295, leaving less than half a million survivors on the dying planet.