Konstantin Tsiolkovski

Konstantin Eduardovich Tsiolkovsky Константи́н Эдуа́рдович Циолко́вский
Konstantin Tsiolkovsky
Born	17 September [O.S. 5 September] 1857 Izhevskoye, Russian Empire
Died	19 September 1935(1935-09-19) (aged 78) Kaluga, Russian SFSR, Soviet Union
Nationality	Russian
Fields	Astronautic theory
Known for	Tsiolkovsky's rocket equation

Konstantin Eduardovich Tsiolkovsky (Russian: Константи́н Эдуа́рдович Циолко́вский; IPA: [kənstɐnʲˈtʲin ɪdʊˈardəvʲɪtɕ tsɨɐlˈkofskʲɪj]; Polish: Konstanty Ciołkowski; 17 September [O.S. 5 September] 1857  – 19 September 1935) was a Russian and Soviet rocket scientist and pioneer of the astronautic theory. Along with the French Robert Esnault-Pelterie, 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.

Tsiolkovsky spent most of his life in a log house on the outskirts of Kaluga, about 200 km (120 mi) southwest of Moscow. A recluse by nature, he appeared strange and bizarre to his fellow townsfolk.

He was born in Izhevskoye (now in Spassky District, Ryazan Oblast), in the Russian Empire, to a middle-class family. His father, Edward Tsiolkovsky (in Polish: Ciołkowski), was a Polish-born Russian Orthodox; his mother, Maria Ivanovna Yumasheva belonged to Russian nobility of Volga Tatar origin. His father was successively a forester, teacher, and minor government official. At the age of 10, Konstantin caught scarlet fever and became hard of hearing. When he was 13, his mother died. He was not admitted to elementary schools because of his hearing problem, so he was self-taught. As a reclusive home-schooled child, he passed much of his time by reading books and became interested in mathematics and physics. As a teenager, he began to contemplate the possibility of space travel.