The biggest moon is "Ganymede" which is a moon of Jupiter.
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there are 13 moons its biggest is triton
Jupiter
The four biggest moons of Neptune are Triton, Proteus, Nereid, and Larissa. Triton is the largest and most well-known of Neptune's moons.
Galileo Galilei named Jupiter's four biggest moons after figures from Greek mythology: Io, Europa, Ganymede, and Callisto. He discovered these moons in 1610 using a telescope.
Jupiter does - called Ganymede.