The JUICE mission (JUpiter ICy moons Explorer) is the ESA's biggest mission ever. Israeli scientists will use it to study the gas giant's atmosphere and the possible oceans on its moons.
Take a look at Earth from far off in space, you'd notice it looks uniformly bright. Considering the Southern Hemisphere's disproportionate expanse of dark ocean waters should reflect back less sunlight, this isn't what we might expect down here.