The danger of asteroid or comet impact is one of the best reasons for getting into space … I'm very fond of quoting my friend Larry Niven: "The dinosaurs became extinct because they didn't have a space program. And if we become extinct because we don't have a space program, it'll serve us right!"

"Meeting of the Minds : Buzz Aldrin Visits Arthur C. Clarke" by Andrew Chaikin (27 February 2001)

Meeting of the Minds: Buzz Aldrin Visits Arthur C. Clarke