Abstract
Some have argued that the Drake equation is incomplete, that it needs additional factors. These proposals lengthen the list of requirements for the emergence of communicating civilizations.
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References
Ward and Brownlee, 274–275.
Michael Papagiannis, “Colonies in the Asteroid Belt, or a Missing Term in the Drake Equation,” in Hart and Zuckerman, editors, 77–84; John H. Mauldin, Prospects for Interstellar Travel, San Diego, American Astronautical Society, 1992, 260; Simon Goodwin with John Gribbin, XTL: Extraterrestrial Life and How to Find It, London, Seven Dials, 2002, 115.
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Michaud, M.A.G. (2007). The Drake Equation, Take Two. In: Contact with Alien Civilizations. Springer, New York, NY. https://doi.org/10.1007/978-0-387-68618-9_12
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DOI: https://doi.org/10.1007/978-0-387-68618-9_12
Publisher Name: Springer, New York, NY
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