its two closest moons
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Neptune's closest objects are its largest moon Triton and the dwarf planet Eris. Triton is a significant moon with a retrograde orbit, while Eris is one of the largest known dwarf planets in our solar system.
The two closest planets to Neptune are Uranus and Pluto. Uranus is located closer to Neptune than Pluto, but both are in the outer regions of our solar system.
Have human or human made objects travel to neptune
Uranus.
That would be Neptune.
No planets surround Neptune. But the closest planet is Uranus.