November 9, 2021 -- Carl Sagan was one of the most well-known scientists of the 1970s and 1980s. He studied extraterrestrial intelligence, advocated for nuclear disarmament and co-wrote and hosted 'Cosmos: A Personal Voyage.'
November 9, 2021 -- Carl Sagan was one of the most well-known scientists of the 1970s and 1980s. He studied extraterrestrial intelligence, advocated for nuclear disarmament and co-wrote and hosted 'Cosmos: A Personal Voyage.'