The Jupiter Icy Moons Explorer (JUICE) keeps its eyes on Jupiter and the giant planet's four largest moons in this artist's concept. Scheduled for launch April 13, JUICE will make a series of close passes by the moons Ganymede (foreground), Europa (partially covering Jupiter), and Callisto (right) before settling into orbit around Ganymede. (The fourth moon, Io, at left, is not a target for the mission.) The three moons may have oceans of liquid water below their icy crusts, and JUICE will try to confirm them. [ESO/VPHAS+ team, et al.]