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50 years ago, man walked on the moon for the first time. Apollo 11 marked the beginning of a new era. But does the rendezvous in space remain the climax between man and moon?

According to the space agencies ESA and NASA, the time is ripe for a new lunar mission.  And this time it is not just a walk, this time the astronauts are coming to stay. What are the goals of this planned lunar mission, how realistic are they? What does science hope for from the rediscovery of the moon?