Our “living” planet is the only one known to humanity for the moment. But we deploy an astonishing ardor in exploring and searching for “others”. And this new frontier arouses strong passions. Jean-Pierre Luminet, cosmologist, and Hubert Reeves, astrophysicist, take spectators on a unique scientific adventure. As guides and principal investigators, they decode for us the marvelous images from the Hubble Space Telescope and the WMAP probe. At their side, a team of avant-garde and passionate researchers work in the shadows, scrutinize and dissect the cosmos using increasingly sophisticated instruments and the power of their imagination.