Probably the Most Difficult Factor to Estimate in the Drake

question 84

Multiple Choice

Probably the most difficult factor to estimate in the Drake equation is

• A) R_*,the rate at which solar-type stars form in the Galaxy.
• B) f_p,the fraction of stars that have planets.
• C) n_e,the number of planets per solar system that are Earthlike (suitable for life).
• D) L,the lifetime of a technologically advanced civilization.

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