Triton (2)
Triton as seen from Voyager 2.
Diameter 2,706 km
1,681 mi.
Distance from primary 354,600 km
220,338 mi.

Triton is the largest major satellite of Neptune. It is slightly smaller than Earth's Moon. Since 1990, several dozen objects have been discovered beyond the orbit of Neptune in a zone called the Kuiper Belt. Triton and Pluto may be the largest remaining examples of these objects. Triton, however, was captured by Neptune early in its history, and intense tidal heating melted most of the interior. Triton's complex geology reflects this violent history and subsequent evolution.[1]