Follow legendary astronomer and astrophysicist Carl Sagan, who was responsible for expanding the scientific understanding of the universe, helping thousands of people to appreciate the wonde... Read allFollow legendary astronomer and astrophysicist Carl Sagan, who was responsible for expanding the scientific understanding of the universe, helping thousands of people to appreciate the wonders of the cosmos.Follow legendary astronomer and astrophysicist Carl Sagan, who was responsible for expanding the scientific understanding of the universe, helping thousands of people to appreciate the wonders of the cosmos.