Konstantin Tsiolkovsky

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Born Saturday 5 September 1857, died Thursday 19 September 1935

Professions: Astronaut, Scientist

Nationality: Russian

Man must at all costs overcome the Earth's gravity and have, in reserve, the space at least of the Solar System.

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The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever.

Words: earth, cradle, humanity, mankind, stay, forever
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