What is the only large moon that circles its planet in the opposite direction to the planets rotation?

Answer 1

Neptunes Triton. Triton's icy surface reflects so much of what little sunlight reaches it that the moon is one of the coldest objects in the solar system, about -240 C (-400 F). It's the only large moon in the solar system that circles its planet in a direction opposite to the planet's rotation (a retrograde orbit), which suggests that it may once have been an independent object that Neptune captured. The disruptive effect this would have had on other satellites could help to explain why Nereid has the most eccentric orbit of any known moon - it's almost seven times as far from Neptune at one end of its orbit as at the other end

Answer 2

The moon Triton, which orbits Neptune, is the only large moon in our solar system that orbits its planet in the opposite direction of the planet's rotation. This is known as a retrograde orbit.