For which of these factors in the Drake equation do astronomers 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:
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Q42: The Drake equation calculates the number of
Q43: Part of determining the Drake factor R*
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Q49: What is the status of the search
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