High-resolution view of Triton's surface from Voyager 2
amateur image processing,
Voyager 1 and 2,
On its closest approach to Triton on August 25, 1989, Voyager snapped several high-resolution mosaics. Triton is considered to be a Kuiper belt object that was captured into Neptune orbit, an event that would have heated it and altered its surface through cryovolcanism. As a result, there are few large craters; a few small ones are visible in this mosaic.
NASA / JPL / Ted Stryk
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Original image data dated on or about August 25, 1989