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Konstantin Tsiolkovsky Quotes Page 1 of 1Konstantin Tsiolkovsky September 5, 1857 - September 19, 1935 Nationality: Russian Category: Scientist Subcategory: Russian Scientist
| Man must at all costs overcome the Earth's gravity and have, in reserve, the space at least of the Solar System. | The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever. |
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