Triton is the largest moon of the planet Neptune and is unique because it orbits the planet in the opposite direction of Neptune's rotation. This unusual retrograde orbit suggests that Triton may have been captured by Neptune's gravity rather than forming alongside it. Triton is known for its icy surface, geysers that shoot nitrogen gas into space, and a thin atmosphere. Discovered in 1846, Triton is one of the few moons in the solar system that is geologically active. Its surface features include large plains and craters, making it a fascinating object of study for scientists. Understanding Triton helps us learn more about the formation and evolution of moons in our solar system.