Published shortly after Sputnik 2, this popular-science work addresses the space race in three parts: the medicine and biology of space (animal experiments, weightlessness, astronaut selection), the race for artificial satellites (Sputnik, Vanguard, Explorer, X-15), and the technical and scientific conditions for a voyage to the Moon. The book stands out for its pioneering treatment of space biomedicine in French popular literature. It includes a 16-page photographic insert.