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date: 19 February 2019

Konstantin Tsiolkovsky 1857–1935
Russian space scientist 

  1. Earth is the cradle of humanity, but one cannot live in a cradle forever.
    more literally ‘A planet is the cradle of mind, but one cannot live in a cradle forever’
    in 1911; see Steven J. Dick and Roger D. Launius Critical Issues in the History of Spaceflight (2006)