Konstantin Tsiolkovsky — Russian Scientist born on September 05, 1857, died on September 19, 1935

Konstantin Eduardovich Tsiolkovsky was a Russian and Soviet rocket scientist and pioneer of the astronautic theory, of Polish and Russian descent. Along with his followers, the German Hermann Oberth and the American Robert H. Goddard, he is considered to be one of the founding fathers of rocketry and astronautics. His works later inspired leading Soviet rocket engineers such as Sergei Korolev and Valentin Glushko and contributed to the success of the Soviet space program... (wikipedia)

The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever.
Man must at all costs overcome the Earth's gravity and have, in reserve, the space at least of the Solar System.