Excerpt from the BBC science documentary on SETI — the earliest extant TV footage of Sagan, then a young astronomer at the Smithsonian Astrophysical Observatory and Harvard.
Summary
The transcript argues that Earth shows little visible evidence of intelligent life at coarse photographic resolution, but radio emissions make our presence detectable across space. It then explains how binary, mathematically structured messages could be designed for extraterrestrial communication and notes the potential range of such contact using advanced radio telescopes.
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