University Of Cologne

Among countless stands of car manufacturers, software developers and engineering universities at Cologne's video games convention, the sight of fatigue-clad soldiers manning the German military's brightly-lit stall draws in the curious.

Jupiter's largest moon, Ganymede, definitely has an underground ocean, researchers said today after confirming the moon's long-suspected subsurface saltwater body with the help of auroras glimpsed by the Hubble Space Telescope.

Among countless stands of car manufacturers, software developers and engineering universities at Cologne's video games convention, the sight of fatigue-clad soldiers manning the German military's brightly-lit stall draws in the curious.

Jupiter's largest moon, Ganymede, definitely has an underground ocean, researchers said today after confirming the moon's long-suspected subsurface saltwater body with the help of auroras glimpsed by the Hubble Space Telescope.