Carl Sagan Quotes
All inquires carry with them some element of risk. There is no guarantee that the universe will conform to our predispositions.
Sagan, Carl. Cosmos. Random House, 1980, p. 91.
Technically, the probability has never changed. However, most probabilities are in relation to a specific event or time. A levee may have only a 1% probably of failing in a hurricane but if there are 10 hurricanes a year, the probability that the levee will fail at least once in 30 years is about 50%.
Carl Edward Sagan was an American astronomer, planetary scientist, cosmologist, astrophysicist, astrobiologist, author, and science communicator. His best known scientific contribution is research on extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by radiation. Sagan assembled the first physical messages sent into space: the Pioneer plaque and the Voyager Golden Record, universal messages intended to be understood by any extraterrestrial intelligence that might find them.
