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In his letter Crick responded to questions raised by Hamilton regarding Crick's theory of directed panspermia, the idea, first presented in Icarus (a journal devoted to astronomy and solar system studies, edited at the time by Carl Sagan), that life on earth was deliberately seeded by an extraterrestrial civilization. Crick discussed the conditions under which organisms containing DNA might be preserved during space travel and entry into earth's atmosphere.
Original Repository:
The Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers
Location:
Box: 12. Folder: PP/CRI/D/1/2/3
Rights:
Reproduced with permission of the Wellcome Library for the History and Understanding of Medicine. and http://library.wellcome.ac.uk/
Original Repository. Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers. 11646. URL. http://archives.wellcome.ac.uk/