The Drake Equation

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Can you name the factors that make up the terms of the Drake Equation?

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TermAbbreviationDrake's estimate
The number of civilisations with whom communication might be possible
The average rate of formation of stars
fraction of stars with planets
number of planets per star that can support life
fraction of habitable planets where life arises
fraction of above inhabited by intelligent beings
fraction of above that generate technology capable of detection from space
length of time that civilisations release detectable information

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