Carl Sagan, for those who may not know, was an astronomer and charismatic cosmologist who came into the public eye in 1980 with the broadcast of his PBS series "Cosmos: A Personal Voyage." That show, in addition to Sagan's many novels, books, and lectures, helped popularize astral science, bringing casual conversations about space to new heights. Sagan's popularity is understandable. He was affable and well-spoken, and he talked about fun scientific concepts like the existence of UFOs,...
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