What are facts about Triton?

Triton is the largest moon of the planet Neptune.

It was discovered by William Lassell on October 10, 1846.

It is the only large moon in the Solar System with a retrograde orbit.

It is the seventh largest moon in the Solar System

It is geologically active as it's surface is young and has relatively few impact craters.

Its surface covered with cold liquid lava, ice and water.