Carl Sagan

Carl Sagan- He was born November 9, 1934 and died December 20, 1996. He was a consultant and adviser to NASA since the 1950's, briefed the Apollo astronauts before their flights to the Moon, and was an experimenter on the Mariner,Viking, Voyager, and Galileo expeditions to the planets. He helped solve the mysteries of the high temperatures of Venus, the seasonal changes on Mars, and the reddish haze of Titan. A consultant and adviser to NASA since the 1950's, briefed the Apollo astronauts before their flights to the Moon, and was an experimenter on the Mariner,Viking, Voyager, and Galileo expeditions to the planets. He helped solve the mysteries of the high temperatures of Venus, the seasonal changes on Mars, and the reddish haze of Titan.

Source:http://www.carlsagan.com/