Carl Sagan by NASA/Cosmos Studies (public domain)

Carl Sagan

Carl Sagan was an astronomer, cosmologist, author, and science popularizer. He is best known for his contributions to the scientific research of extraterrestrial life, his popular science books including Pale Blue Dot, and most famously his award-winning TV series Cosmos. Although Sagan does not have a known Sabbath number, he was responsible for producing the Voyager Golden Record and has been sampled in John Boswell's Symphony of Science project.

Paths from Carl Sagan to Paul Erdős

Paths from Carl Sagan to Kevin Bacon