A European spacecraft rocketed away Friday on a decadelong quest to explore Jupiter and three of its icy moons that could hold buried oceans. When contact finally was confirmed close to an hour into the flight, Mission Control in Germany declared: “The spacecraft is alive!”It will take the robotic explorer, dubbed Juice, eight years to reach Jupiter, where it will scope out not only the solar system’s biggest planet but also Europa, Callisto and Ganymede. Only one spacecraft remains humming at Jupiter: NASA’s Juno, which just logged its 50th orbit since 2016