31 dez 1961 ano - 1961 Carl Sagan "Sagan published an article in 1961 in the journal Science on the atmosphere of Venus... in 1961 Harvard astronomers Fred Whipple and Donald Menzel offered Sagan the opportunity to give a colloquium at Harvard and subsequently offered him a lecturer position... Sagan instead asked to be made an assistant professor... Whipple and Menzel were able to convince Harvard to offer Sagan the position... Sagan lectured, performed research, and advised graduate students... from 1963 to 1968"

Descrição:

https://en.wikipedia.org/wiki/Carl_Sagan

https://youtu.be/5Qzwl45Kc0w?si=Jeq21eHEPYq-LdRZ

Davidson, Keay (1999). Carl Sagan: A Life. New York: John Wiley & Sons. ISBN 978-0-471-25286-3. LCCN 99036206. OCLC 41580617.

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