ESA’s Jupiter Icy Moons Explorer, Juice, is humankind’s next Jupiter explorer. The bold mission will make detailed observations of the giant gas planet and its three large ocean-bearing moons – Ganymede, Callisto and Europa – with a suite of instruments. Juice will characterise these moons as both planetary objects and possible habitats, explore Jupiter’s complex environment in depth, and study the wider Jupiter system as an archetype for gas giants across the Universe.