Some of Neptune’s moons were discovered by the Voyager 2 spacecraft when it flew past in 1989.
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Neptune appears bright blue because the methane in its atmosphere absorbs red light and reflects blue light.
The Voyager 2 spacecraft that visited Neptune is now in interstellar space.
Only one spacecraft, Voyager 2, has ever visited Neptune up close.
Neptune has white clouds made of methane ice crystals that float high in its atmosphere.