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esses conceitos, foram mais tarde desenvolvidosde forma independente por, no mínimo, quatro cientistas:* o lituano, kazimierz siemienowicz (1600–1651)* o russo, konstantin tsiolkovsky (1857–1935)* o norte-americano, robert goddard (1882–1945)* o alemão, hermann oberth (1894–1989), nascido em hermannstadt, transilvâniaem 1947, mikhail tikhonravov desenvolveu a teoria de estágios paralelos, ou em "penca".
this concept was developed independently by at least four individuals:*kazimierz siemienowicz of the polish–lithuanian commonwealth (1600–1651)*the russian konstantin tsiolkovsky (1857–1935)*the american robert goddard (1882–1945)*the german hermann oberth (1894–1989), born in hermannstadt, transylvaniain 1947, mikhail tikhonravov developed a theory of parallel stages, which he called "packet rockets".
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