Jupiter has four large moons – Io, Europa, Ganymede and Callisto – with diameters of more than 3000 kilometres. However, as of April 2023, we know it is also home to 91 additional small satellites.

But it hasn’t always been this way. Jupiter’s four largest moons – Io, Europa, Ganymede and Callisto – were the first ever discovered orbiting another planet. They were spotted by Galileo ...

In March and April 2025, internet users shared a striking image that they claimed showed "Steeple Mountain," a massive point ...

These pinpricks of light are actually Jupiter's four largest moons, now known as the Galilean moons: Io, Europa, Ganymede, and Callisto. Many of these celestial orbs are as remarkable as Jupiter ...

Most likely, the first alien life we discover will be hidden beneath miles of ocean on a distant world like Jupiter's moon Europa or ... is to find pieces of the puzzle that make up the larger ...

Io is an incredibly active and extreme place, with glistening lava lakes and volcanic eruptions shooting sulfur and magma to ...

The European Space Agency is preparing a spacecraft to embark on an eight-year-long journey to Jupiter, where it will study the gas giant’s moons for ... complete at least four orbits of the ...

Its Juice satellite will leave Earth on Thursday to begin an eight-year journey to Jupiter, where it will study the gas giant's major moons. There's good evidence that these icy worlds - Callisto ...