This mosaic shows the surfaces of Jupiter’s four Galilean moons images, as seen by NASA’s Galileo spacecraft. NASA/JPL/DLR We know the innermost Galilean, pus-colored Io, is covered in ...

On 12 March 2013, Galileo satellite GSAT0104, alongside its fellow In-Orbit Validation (IOV) satellites, made history by enabling the first position fix by Europe's independent satellite ...

The twin Galileo satellites are now fully fuelled and mated together atop the upper stage that will haul them most of the way up to their final orbit. The launch is now planned for the evening of ...

Jupiter may have once been more than twice its current size, with a magnetic field 50 times stronger, say scientists who ...

Jupiter’s rule of the evening sky is coming to a close. Catch some action there while you can, shortly after sunset this ...

On Jan. 7, 1610, Galileo discovered four moons revolving around Jupiter — a discovery that would change his life forever. These four moons are Jupiter’s largest satellites — lo, Europa ...

Jupiter will look bigger and brighter than normal on Monday night as it rises opposite of the sun and reaches its closest point to Earth in decades. It will be so close that the planet's banding ...

The European Union runs its own constellation of sophisticated global positioning satellites called Galileo. This system is ...