Abstract
Guthke may have been too dismissive when he wrote that the Drake equation is made up entirely of unknowns.1 Since that equation was written, there have been significant scientific findings affecting some of its factors.
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Michaud, M.A.G. (2007). Probabilities: The Astronomical Factors. In: Contact with Alien Civilizations. Springer, New York, NY. https://doi.org/10.1007/978-0-387-68618-9_7
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