a bright"star" blazing. With Earth between the sun and the giant planet, it's at its biggest, brightest and best. Look closely, however—using any pair of binoculars or a zoomed-in phone camera—and you'll see four dots of light in a line beside it. These so-called Galilean Moons—Io, Callisto, Ganymede and Europa—are Jupiter's largest.
"Their discovery is credited to Galileo, but they were possibly discovered at the same time by Simon Marius—and it's his names for the moons that have stuck," said Dexter. Since their 1610 discovery, the four Galilean moons have emerged as drastically different worlds."It's almost as if they were deliberately made to have music written about them because they're just so distinct," said Dexter.
For Ganymede, Dexter got consumed by the idea that you could stand on the moon—the most habitable of the four—at night and see Jupiter and its aurora in its sky."I went for a more modern, quirky feel with a triumphant theme that hints at colonization thousands of years in the future," said Dexter.