Jupiter’s largest moon, Ganymede, is remarkably similar in size to a planet, exceeding even Mercury in diameter. Scientists have confirmed the presence of a substantial ocean concealed beneath Ganymede’s icy crust, potentially containing more water than all of Earth’s oceans combined. Uniquely for a moon, Ganymede generates its own magnetic field, offering protection and insights into its internal structure. The moon boasts a complex, layered interior consisting of an iron core and a rocky mantle. These planetary characteristics position Ganymede as a fascinating subject for future exploration and a key to understanding the formation of icy worlds. This discovery underscores the increasing recognition of Ganymede as a potentially habitable celestial body.