Konstantin Tsiolkovsky
Person
Russian and Soviet rocket scientist who is a pioneer of cosmonautics, quoted at the end of the podcast saying, 'The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever.'
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Videos Mentioning Konstantin Tsiolkovsky

Clara Sousa-Silva: Searching for Signs of Life on Venus and Other Planets | Lex Fridman Podcast #195
Lex Fridman
Russian and Soviet rocket scientist who is a pioneer of cosmonautics, quoted at the end of the podcast saying, 'The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever.'

Diana Walsh Pasulka: Aliens, Technology, Religion & the Nature of Belief | Lex Fridman Podcast #149
Lex Fridman
A Russian rocket scientist and founder of astronautics, who held specific non-dogmatic Christian beliefs and interacted with what he believed to be angels, influencing early Russian space programs.