Rockets. Orbital stations. A space elevator. Air-cushion trains. All these astonishing ideas were born in the mind of an ordinary schoolteacher—K. E. Tsiolkovsky. He believed that one day humanity would overcome the forces of gravity and rise to the stars. And it happened. The creative legacy of the “wise man from Kaluga” is truly unbelievable. On the one hand, it includes scientific works with precise calculations that turned the dream of conquering the universe into reality. On the other hand, it’s a real “space philosophy”: reflections on the nature and purpose of humans, the structure of society, and questions of ethics.