BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Konstantin Tsiolkovsky's house. Although he never built a rocket, Tsiolkovsky (1857-1935) was highly influential in the development of Soviet rocket and space technology. He determined that the Earth's escape velocity was 8 kilometres per second and showed that this could be achieved using liquid-fuel rockets. He predicted many aspects of space travel, including double-walled hulls for meteor protection and the problems of weightlessness. Photographed in Kaluga, Russia.
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