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Animation of the surface of Triton, with two huge plumes from geysers and Neptune low in the sky. Triton is by far the largest moon of Neptune, and it orbits the ice giant more closely than Earth's Moon orbits Earth, at just over 350,000 kilometres. Its surface is covered in a layer of nitrogen ice, and solar heating can sublimate the nitrogen beneath this, buildng up pressure until it breaks through the surface to form a tall plume. Triton orbits Neptune in the opposite direction to Neptune's rotation, indicating that it is a captured body rather than a satellite that formed with Neptune