Drake Equation Hats

Description: The Drake equation. The truth is out there

Description: Milky Way and Drake Equation in the Galaxy Astronomy Lovers Extraterrestrial Civilizations

Description: Drake equation, also called Green Bank equation, equation that purports to yield the number N of technically advanced civilizations in the Milky Way Galaxy as a function of other astronomical, biological, and psychological factors.

Description: Drak equation giving a probabilist argument estimating the number of active, extraterristrial life in the milky way