Four of Jupiter's moons: Io, Europa, Ganymede and Callisto — known as the Galilean moons — were the first celestial objects to be discovered orbiting an object other than the sun or Earth when ...

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, ...

Jupiter's four best-known moons are the Galilean moons, discovered by Galileo Galilei in 1610. They are named Ganymede, Callisto, Io and Europa, after figures in Greek mythology associated with ...

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 ...

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. By Robin George Andrews A ...

Jupiter's four brightest moons — Ganymede, Callisto, Europa and Io — are similar in size to our own moon, and orbit the planet from 1.8 to 16.7 days.

According to Naoyuki Hirata, an assistant professor of planetology at Kobe University, the heftiest of Jupiter's Galilean moons likely experienced a smack from a massive asteroid when our own ...

Jupiter isn’t alone in this category; Saturn, Uranus, and Neptune are also gas giants, though Uranus and Neptune are often ...

Jupiter's four best-known moons are the Galilean moons, discovered by Galileo Galilei in 1610. They are named Ganymede, Callisto, Io and Europa, after figures in Greek mythology associated with ...

The celestial objects are so small, they're not even among Jupiter's four famous Galilean moons, which does include Io.But Amalthea and Thebe orbit the planet even closer than Io and have slightly ...

If you're lucky, you'll spot the four Galilean moons: Ganymede, Callisto, Io and Europa. Italian astronomer Galileo Galilei first spotted Jupiter's moons in 1610.

Some of the moons he's discovered around Jupiter are about that size — a person could walk across them in around twelve minutes. From Earth, these little moons look like flecks of light.