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	Drake Equation Encyclopedia Article @ NaturalResearch.org (Natural Research) (Site not responding. Last check: 2007-11-07)
		The Drake equation (also known as the Green Bank equation or the Sagan equation) is a famous result in the speculative fields of xenobiology, astrosociobiology and the search for extraterrestrial intelligence.
		This equation was devised by Dr. Frank Drake (a professor at the University of California, Santa Cruz) in the 1960s in an attempt to estimate the number of extraterrestrial civilizations in our galaxy with which we might come in contact.
		In Sagan's case, the Drake equation was a strong motivating factor for his interest in environmental issues and his efforts to warn against the dangers of nuclear warfare.
	www.naturalresearch.org /encyclopedia/Drake_equation (1844 words)

	Encyclopedia Galactica - Dr to Dt - Human (Anglic) Revised 351st Edition
		Atomic age Old Earth radio astronomer Frank Drake was the first to formulate an equation which represents the probability of there being other civilisations in the galaxy capable of communicating.
		However, owing to the limited knowledge of the time, there was little solid data on which to base the numbers, and the answers vary widely and according to personal preference.
		The equation was to be greatly modified by the Rare Earth Theorum during the early Interplanetary period.
	www.orionsarm.com /eg/d/Dr-Dt.html (1328 words)

	ipedia.com: Drake equation Article (Site not responding. Last check: 2007-11-07)
		The Drake equation is a famous result in the speculative fields of xenobiology, astrosociobiology and the search for extraterrestrial intelligence.
		This equation was devised by Dr. Frank Drake in the...
		N is the number of extraterrestrial civilizationss in our galaxy with which we might expect to be able to communicate
	www.ipedia.com /drake_equation.html (1444 words)

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