"Polytel International." . . . . . . . . . "Encyclopedia galactica Who speaks for earth?" . . "1st program: Sagan explores the probability of other intelligent civilizations in the universe and the ways in which contact might be made. 2nd program: Sagan reviews the ideas of cosmic evolution, the methodology of the scientific approach, and the limitations of our perceptions about the cosmos." . . . . . . . . . . "Earth (Planet)" . . . .