In an interview with Johnny Carson in 1978, the astrophysicist discussed what he viewed to be scientific inaccuracies in the then-newly released sci-fi movie, 'A New Hope.'
, with its scorching surface temperatures, as an example of a planet with a runaway greenhouse effect
He said:"The lesson is not only that a greenhouse effect can exist but that a large greenhouse effect can be exceptionally dangerous. "So for anyone who views our exquisite planet and hears the warnings of scientists and says 'all this greenhouse stuff is just some theory,' I ask them to reflect on the fate of the planet Venus, our nearest planetary neighbor."
He also went on to use the lifeless planet Mars as an example of what happens to a world that does not have an ozone layer; another aspect of Earth's atmosphere that scientists haveCarl Sagan died in 1996, aged 62. He held a bachelor's and master's degree in physics, a doctorate in astronomy, and taught at both Harvard and Cornell universities.
Carl Sagan pictured in a laboratory at Cornell University in New York, March 1974. The astronomer became a well-known public figure.
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