Which factor in the modified Drake equation may well turn out to be the primary factor in determining the current number of intelligent civilizations in our galaxy? A) N_hp, the number of habitable planets in our galaxy B) f_civ, fraction of life-bearing planets where intelligent civilizations have at some time arisen C) f_now, fraction of civilization-bearing planets that have intelligent civilizations on them now D) f_life, fraction of life-bearing habitable planets

Question

Quizplus · Accepted Answer

While all factors in the modified Drake equation are important, it is possible that the fraction of civilization-bearing planets that have intelligent civilizations on them now (f_now) is the primary factor in determining the current number of intelligent civilizations in our galaxy. This is because even if there are many habitable planets and a high fraction of life-bearing planets where intelligent civilizations have arisen, if those civilizations no longer exist, they cannot be counted in the current number. Therefore, the fraction of civilization-bearing planets that currently have intelligent civilizations on them may provide the most accurate estimate of the current number of intelligent civilizations in our galaxy.

Which Factor in the Modified Drake Equation May Well Turn