Carl sagan pbs5/22/2023 ![]() ![]() Data from NASA’s first Venus probe, Mariner 2 in 1962, confirmed Sagan’s theory. He argued Venus, covered with heavy clouds, was warmed by a “greenhouse effect” and had a surface temperature of about 900° fahrenheit. Sagan began consulting with NASA in the early 1960s as an expert on planetary sciences. The project would remain secret until it was revealed by a Sagan biographer in 1999. ![]() The Air Force would call off the project in 1959, convinced the public would not react well to such a show of force. The Air Force hoped the detonation would be visible from Earth – a visible demonstration of U.S. NASA hoped such a detonation might lead to more understanding about the geology of the moon. ![]()
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