Triton (Neptune's Moon) - (Important Facts) {Part-51}

THE LARGEST MOON OF NEPTUNE, and comprising 98% of the mass orbiting the planet, Triton is the only the moon in the Solar System to have a retrograde orbit, meaning it orbits in the opposite direction to all other moons.

Triton

Because of its orbit, it is thought that the moon was once a Kuiper belt object like Pluto that was captured by Neptune's gravity.
Triton is also one of the few moons of the Solar System to be volcanically active, however due to the very low temperature far from the Sun, its volcanoes erupt water and ammonia rather than liquid rocks.

Surface of Triton

It is large enough for its interior to have differentiated into a rocky/metallic core under an icy mantle. The contains enough mass that radioactive decay might be warming it from the inside, which could be responsible for the Cryovolcanic activity.

Cryovolcanic activity

In addition to cryovolcanoes, Triton also exhibits geysers, which erupt with gaseous nitrogen for up to a year at a time.

Triton Geysers

Because of constant volcanic activity, Triton's surface relatively young having wiped away almost all signs of impact craters.