Assuming the conditions ripe for life and intelligence abound in the Galaxy, what factor limits the number of galactic civilizations currently in existence?
A) the number of supernova explosions
B) the average survival time of the civilizations
C) the expansion of the universe
D) the speed of technological development
E) the lack of metals for technology

Question

Quizplus · Accepted Answer

The average survival time of civilizations is a critical factor in determining the number of galactic civilizations currently in existence. This is because even if conditions for life and intelligence are common, the longevity of a civilization's ability to communicate or explore beyond its planet significantly influences its detectability and the likelihood of its simultaneous existence with other civilizations.

Assuming the Conditions Ripe for Life and Intelligence Abound in the Galaxy