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.

Thursday, Aug. 5 marked 10 years since NASA sent Juno off on a one-way trip to explore the largest planet in our solar system. The probe didn't reach its destination, Jupiter, until July 2016.

GALA is a 'laser altimeter' – an instrument that measures the heights and depths of a planetary landscape via the transit time of laser pulses. The GAnymede Laser Altimeter (GALA) for ESA's JUICE ...

Europa Clipper will peer beneath the moon's icy crust where an ocean is thought to be sloshing fairly close to the surface. It won't search for life, but rather determine whether conditions there ...