Which of Jupiter's satellites is the largest moon in the entire Solar System?
Answer
Ganymede.
Jupiter possesses a massive family of moons, four of which are famously known as the Galilean moons (Io, Europa, Ganymede, and Callisto). Among these major companions, Ganymede holds a unique distinction: it is not only Jupiter's largest moon but also the largest moon in the entire Solar System. Furthermore, its size surpasses that of the planet Mercury, illustrating the vast scale of Jupiter's satellite system.

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