Astronomers have uncovered new evidence that Jupiter’s moon Callisto likely harbors a massive underground ocean, potentially ...

Initially believing they were distant stars, Galileo’s repeated observations over several nights and realized they were moons orbiting the gas giant. And thus, Io, Europa and Ganymede became ...

Although both Voyager spacecraft as well as the Galileo probe took images of Ganymede in the late 1900s, many areas of the moon have not yet been imaged with sufficient resolution, limiting ...

Ganymede is a moon that wears its scars with ... been a notable landmark in the heavens ever since renowned astronomer Galileo Galilei glimpsed it through his telescope one fateful evening in ...

Europa is the sixth largest satellite in our Solar System and the smallest of Jupiter’s four Galilean moons. Discovered by ...