On March 20, 1956, 10 P.M. a thought of a very remote possibility entered my mind, which I fear will never leave me again. Contact with Space (1957)
It is not beyond actual possibilities that men from outer space have landed (or will in the future land) on earth and have begun to breed here for whatever reason they may have had. Contact with Space (1957)
It was seeing the science-fiction film The Day the Earth Stood Still, about a spaceman who comes to Earth in a flying saucer to save us from self-destruction in a nuclear war. Contact with Space (1957)