Jupiter's moon Ganymede is the biggest moon in the solar program. It is larger than World Mercury and dwarf Earth Pluto, and It is about a few-quarters the scale of Mars. It is also the only moon known to acquire its own magnetic discipline. Huge-effects hypothesis. In Wikipedia. By NASA/JPL-Caltech, https://hectorchhhg.weblogco.com/34902453/moons-an-overview