Triton is the largest moon of Neptune and the seventh largest in Sol. It's the coldest known body in Sol. Voyager 2 recorded a surface temperature of -235 °C (-391 °F). Its surface has few impact craters which means it's a relatively young moon (6 to 50 million years old). It's geologically active with geysers, volcanos and earthquakes.
Triton was first discovered by the British astronomer William Lassell on 10 October 1846, just 17 days after Neptune was discovered by the German astronomer Johann Gottfried Galle and Heinrich Louis d'Arrest.
Triton currently requires a permit. Exclusionary zone at 130 km above the planet surface with the message "This planet is currently off-limits to visitors".
It's controlled by the faction Mother Gaia.