Jupiter hosts more than 100 moons, with most attention focused on the four Galilean moons: Io, Europa, Ganymede and Callisto. This is primarily due to their active geology, including Io being the most volcanically active planetary body in the solar system and Europa having a vast subsurface liqu...
Source: [Phys.org](https://phys.org/news/2026-08-esa-juice-probe-dark-jovian.html)