Io, a highly volcanic world, is the innermost Galilean moon of Jupiter. Got a pair of binoculars? Point them at Jupiter tonight—or any night during its bright opposition month—and you’ll ...

Dexter defines The Galilean Suite as tone poems, but while Holst’s inspiration for The Planets was astrological, this work is influenced by what we know about the moons’ geology.

All together, they form a satellite system which is called the Jovian system. The most massive of the moons are the four Galilean moons: Io; Europa; Ganymede; and Callisto, which were independently ...

We know those first four moons now as the Galilean moons, although Galileo actually called them the Medicean Stars to suck up to his patrons, the famous Medici family. (A few years later ...