In 1934, astronomer Carl Sagan was born.
Carl Sagan was a consultant and adviser to NASA since the 1950s. He briefed the Apollo astronauts before their flights to the Moon, and was an experimenter on the numerous expeditions to the planets. He hosted the Cosmos television documentary series as well as authoring a book of the same name. Carl Sagan died on December 20, 1996.
Learn more at http://www.carlsagan.com.
