High Quality Content by WIKIPEDIA articles! The Europa Jupiter System Mission – Laplace (EJSM/Laplace) was a proposed joint NASA/ESA unmanned space mission slated to launch around 2020 for the in-depth exploration of Jupiter`s moons with a focus on Europa, Ganymede and Jupiter`s magnetosphere. The mission would comprise at least two independent elements, NASA`s Jupiter Europa Orbiter (JEO) and ESA`s Jupiter Ganymede Orbiter (JGO), to perform coordinated studies of the Jovian system.