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CHAPTER 5, IS THERE INTELLIGENT LIFE ON EARTH?<br />

Carl Sagan, W. R. Thompson, Robert Carlsson, Donald Gurnett, and Charles Hord, "A Search for Life on Earth<br />

from the Galileo Spacecraft," Nature, vol. 365 (1993), pp. 715-721.<br />

CHAPTER 7, AMONG THE MOONS OF SATURN<br />

Jonathan Lunine, "Does Titan Have Oceans?," American Scientist, vol. 82 (1994), pp. 134-144.<br />

Carl Sagan, W. Reid Thompson, and Bishun N. Khare, "Titan: A Laboratory for Prebiological Organic<br />

Chemistry," Accounts of Chemical Research, vol. 25 (1992), pp. 286-292.<br />

J. William Schopf, Major Events in the History of Life (Boston: Jones and Bartlett, 1992).<br />

CHAPTER 8, THE FIRST NEW PLANET<br />

Bernard Cohen, "G. D. Cassini and the Number of the Planets," in Nature, Experiment and the Sciences,<br />

Trevor Levere and W. R. Shea, editors (Dordrecht: Kluwer, 1990).

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