Billions and Billions: Thoughts on Life and Death at the Brink of the Millennium

Explore 1 quote from Billions and Billions: Thoughts on Life and Death at the Brink of the Millennium

Extraordinary claims require extraordinary evidence.

Carl Sagan

More information about this quote

Topic

Evidence

Author

Carl Sagan

Source

Four Cosmic Questions Billions and Billions: Thoughts on Life and Death at the Brink of the Millennium

Medium

Essay

Language

English

Time

1996 1990s 20th century

Authentication Score 3

Citation

Sagan, Carl. "Four Cosmic Questions." Billions and Billions: Thoughts on Life and Death at the Brink of the Millennium. Random House, 1997, ch. 5.