Why do we only consider stars with masses less than about 1.5 Me in the Drake equation when estimating the number of possible stars in our galaxy around which planets could form that would support our kind of intelligent life?
A) This type of star would produce so much damaging UV radiation that it would sterilize its planets.
B) Such massive stars would never reach temperatures sufficient to maintain life-supporting conditions on the surfaces of its planets.
C) Stars more massive than this would have evolved so rapidly that a sufficiently advanced civilization would not have had time to evolve and develop.
D) Planets could not form sufficiently close to such stars for life to have survived and evolved.
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