In 1893, 70 years before Gagarin’s flight, the great scientist Konstantin Tsiolkovsky created a work that still amazes readers with the accuracy of its predictions. The story’s hero, in a marvelous way, finds himself on the Moon together with his friend. Before the reader unfolds a detailed depiction of what a person feels under lunar gravity, how matter behaves as temperatures change, and what the Earth looks like from the surface of the satellite.