If we are optimistic in our assumptions about the development of life and intelligence, then the number of technological civilizations currently in the galaxy should equal the
A) average number of planets that produce life.
B) average lifetime of a civilization.
C) average number of planets per star.
D) number of stars in the galaxy's habitable zone.
E) number of stars forming per year.

Question

Quizplus · Accepted Answer

The number of technological civilizations in the galaxy is determined by the average lifetime of a civilization, as longer-lived civilizations increase the likelihood of their presence at any given time.

If We Are Optimistic in Our Assumptions About the Development