For which factor in the Drake equation do we actually have observational knowledge rather than just a speculative estimate?
A) R*, the rate at which solar-type stars form in the Galaxy
B) fl, the fraction of Earthlike planets on which life actually arises
C) fᵢ, the fraction of life-forms that evolve into intelligent species
D) fc, the fraction of intelligent species that develop adequate technology and then choose to send messages out into space
Correct Answer:
Verified
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