What is the biggest moon in the solar system?
Jupiter's moon Ganymede is the largest moon in the solar system.
Ganymede is the 7th most distant moon from Jupiter and with a diameter of 5,268km is the largest moon in the solar system.
It is slightly bigger than Saturn's moon Titan which has a diameter of 5,151km. It was thought that Titan was the biggest moon in the solar system until the Voyager probes made more accurate measurements in 1979.
Ganymede is bigger than the planet Mercury which has a diameter of 4,879km which makes Ganymede the 7th largest body in the solar system.