01
Triton, Neptune's largest moon, is an icy world on a retrograde orbit that strongly suggests capture rather than formation in place.
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02
A captured Triton would initially have occupied a more eccentric orbit, and tidal dissipation during orbital circularization could have generated substantial internal heat.
supported03
Voyager 2 imaged Triton's cantaloupe-like terrain, smooth plains, dark plume deposits, and a thin nitrogen atmosphere.