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Konstantin Eduardovich Tsiolkovsky (17 September 1857, Izhevskoye, Ryazan Oblast; 19 September 1935, Kaluga) was a Russian scientist and teacher who worked on rocket dynamics and spaceflight theory, as well as aerodynamic experiments, airship designs, science fiction and philosophical texts. His work centered on the application of variable mass motion to rocket flight, the implications of the reaction propulsion principle in space environments, the concept of multistage rockets and systemic assu