This illustration depicts Pluto and its five moons from a perspective looking away from the sun. It is adapted from a classic Voyager I montage of Jupiter’s Galilean moons, and is intended to ...

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 ...

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 ...

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.