And thus, Io, Europa and Ganymede became known as the Galilean moons of Jupiter. Learn more about NASA’s current mission to Europa here. Multimedia editor Rob Landers wrote and verified this ...

Jupiter’s four largest moons – Io, Europa, Ganymede and Callisto – were the first ever discovered orbiting another planet. They were spotted by Galileo Galilei more than 400 years ago ...

The four "Galilean moons" were named after Italian astronomer Galileo Galilei, who is thought to have discovered them in 1610. As night falls, Jupiter will rise in the east-northeast, among the ...

Io is an incredibly active and extreme place, with glistening lava lakes and volcanic eruptions shooting sulfur and magma to ...

What can a sample return mission from Jupiter's volcanic moon, Io, teach scientists about planetary and ... previous spacecraft missions to the Jovian (Jupiter) system, including Galileo, New Horizons ...

Jupiter has many interesting moons in its repertoire, including the famed Galilean satellites. Among them is Europa, an icy moon with a subsurface ocean. With its frozen surface, Europa is ...