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  4. Carl Sagan
  5. A single message from space will show that it is possible...

A single message from space will show that it is possible to live through technological adolescence. . . . It is possible that the future of human civilization depends on the receipt of interstellar messages.

Carl Sagan
Moon, Space, Civilization
A single message from space will show that it is possible to live through technological adolescence. . . . It is possible that the future of human civilization depends on the receipt of interstellar messages.