Discovered in 1846, Triton is the largest moon of Neptune - but it’s unlike any other. Scientists believe it was once a free-floating planet before Neptune’s gravity captured it.

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It took this image of Neptune and its moon Triton, one of 77 composite photographs that appeared in our 2016 exhibition, Otherworlds: Visions of our Solar System, before speeding towards interstellar ...

Ganymede, Jupiter's largest moon and the solar system's largest, is bigger than Mercury and the dwarf planet Pluto, with a diameter of 5,268 kilometers.

Potentially launching around 2039 is a nuclear-powered mission to Neptune to study its ring, atmosphere, and the moon Triton. The orbiter mission would aim to explore the habitability of the ...