An ambitious mission to Neptune could study both the planet and Triton

Mission concepts to the outer solar system are relatively common, as planetary scientists are increasingly frustrated by our lack of knowledge of the farthest planets. Neptune, the farthest known planet, was last visited by Voyager 2 in the 1980s.

source https://phys.org/news/2024-09-ambitious-mission-neptune-planet-triton.html