Europa Clipper and JUICE are set up to give scientists game-changing information about the potential habitability of Jupiter’s moons. While both missions will gather data on multiple moons, JUICE will spend time orbiting and focusing on Ganymede, and Europa Clipper will make dozens of close flybys of Europa.

NASA’s Europa Clipper spacecraft successfully launched Monday afternoon from the agency’s Kennedy Space Center on Florida’s east coast. The mission marks the first time scientists will explore Jupiter’s icy moon, Europa, which is widely considered the most likely place beyond Earth to have life right now.

NASA has launched its Europa Clipper spacecraft, the biggest one it has ever built for a mission heading to another planet, on top of a SpaceX Falcon Heavy rocket from the Kennedy Space Center in Florida.