At more than 5,000 kilometers (more than 3,000 miles) across, Ganymede rivals Mercury in size, taking first prize for the Solar System's largest natural satellite. The monolith has been a notable ...

Ganymede, Jupiter's largest moon and the solar system's largest, is bigger than Mercury and the dwarf planet Pluto, with a diameter of 5,268 kilometers.

The GAnymede Laser Altimeter (GALA) for ESA's JUICE mission to Jupiter consists of two electronics units and an optical component containing the laser and the telescope for the receiver. When ...