Triton, largest moon of Neptune. Thought to have been a dwarf planet from the Kuiper belt, captured by Neptune’s gravity.

Global mosaic of Triton annotated to highlight major features discussed in paper “Triton: Topography and Geology of a Probable Ocean World with Comparison to Pluto and Charon”. Narrow curvilinear markings are approximate terrain boundaries, heavy lines are linear features such as ridges. . . Map boundaries are notional in areas where boundaries are indistinct.

Credits: