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                                                                            ANSWER: Europa
                                                                             Explanation: 
 Jupiter has 67 natural satellites. Out of those 4 (Io, Europa, Ganymede, Callista) are massive and are known as Galilean Moons.NASA is planning to send a lander on the Europa to find signs of life. The probe will find Europa's composition, the nature of its sub-surface ocean, as well as its ability to host life.The European Space Agency's Jupiter Icy Moon Explorer (JUICE) is a mission to Europa that is due to launch in 2022.The mission is now known as Europa Multiple-Flyby Mission.It comprises of an orbiter and a lander. Set for a launch in the 2020s (around 2022), the spacecraft are being developed to study the Galilean moon Europa through a lander and a series of flybys while in orbit around Jupiter.
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