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Home This global color mosaic of Neptune’s moon Triton was taken in 1989 by Voyager 2 during its flyby of the Neptune system. (NASA/JPL/USGS) This global color mosaic of Neptune's moon Triton was taken in 1989 by Voyager 2 during its flyby of the Neptune system. (NASA/JPL/USGS)

This global color mosaic of Neptune’s moon Triton was taken in 1989 by Voyager 2 during its flyby of the Neptune system. (NASA/JPL/USGS)

This global color mosaic of Neptune's moon Triton was taken in 1989 by Voyager 2 during its flyby of the Neptune system. (NASA/JPL/USGS)

This global color mosaic of Neptune’s moon Triton was taken in 1989 by Voyager 2 during its flyby of the Neptune system. (NASA/JPL/USGS)

A new Discovery mission proposal, Trident would explore Neptune’s largest moon, Triton, which is potentially an ocean world with liquid water under its icy crust. Trident aims to answer the questions outlined in the graphic illustration above. (NASA/JPL-Caltech)