Soviet space program
The rocket and space program of the Soviet Union , which initially employed captured scientists from the V-2 rocket program , was performed mainly by Soviet engineers and scientists after 1955 , and was based on some unique Soviet and Imperial Russian theoretical developments , many derived by Konstantin Tsiolkovsky , sometimes known as the father of theoretical astronautics . 
<triplet> Konstantin Tsiolkovsky <subj> astronautics <obj> field of work