CBC Newsmagazine interview segment — Sagan argues that the processes that produced intelligent life on Earth could occur elsewhere in the universe.

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.

Sagan's first Royal Institution Christmas Lecture in the 1977 'Planets' series, broadcast on BBC2 in early 1978.