The origins of Jupiter's Galilean moons is a long-standing mystery. But new research suggests a promising pathway for how they may have formed. From bottom to top is Io, Europa, Ganymede, and ...

Growing moons. In general, researchers agree that the four Galilean moons — Io, Europa, Ganymede and Callisto — probably formed from a disk of gas that surrounded Jupiter in its infancy.

While the moons are passing in front of Jupiter, they also cast their shadows on the planet's cloud deck below them. These shadows may be observed with telescopes of at least 90mm aperture ...

Io orbits closest to Jupiter, out of the four Galilean moons. Io has been studied by spacecraft from Pioneer 10 and 11 in 1973 and 1974, all the way up to New Horizons in 2007, augmented by Earth ...

For decades scientists have struggled to understand the strange density differences in Jupiter’s four Galilean moons—which, in order from closest to the planet to farthest from it, are Io ...

Researchers reported auroras around Jupiter’s two largest Galilean moons for the first time and found new features in the auroras of volcanic Io and icy Europa. Share full article. 15.

This montage shows views of Jupiter's four 'Galilean moons' as captured by the LORRI camera system on NASA's New Horizons spacecraft in 2007 as it picked up extra momentum for its target, the dwarf ...

Most of us know four moons of Jupiter, called the Galilean moons because they were first discovered by Galileo in 1610. Named for figures closely associated with Jupiter from Greek mythology, Io ...

A recent study found that Jupiter was once twice the size that it is now, making it big enough to swallow up 2,000 Earths.

Scientists have spotted 12 more moons around Jupiter, adding to an already-huge number that just seems to grow and grow. There's so many moons around this gas giant planet that astronomer Scott ...

A calendar guide to help you pinpoint the four Galilean moons the next time the sky is clear. $2 for 6 months SUBSCRIBE NOW Read Today's Paper Wednesday, June 18 ...