The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever. Konstantin Tsiolkovsky Konstantin Eduardovich Tsiolkovsky (Russian: Константи́н Эдуа́рдович Циолко́вский; 17 September [O.S. 5 September] 1857 – 19 September 1935) was a Russian and Soviet rocket scientist who pioneered astronautic theory. Along with the… Read More ›