When considering the number of technologically advanced civilizations in our galaxy, it is useful to consider
A)the average life span of an alien.
B)the average life span of the civilization.
C)the distance to the civilization's planet.
D)the type of advanced communication they use.

Question

Quizplus · Accepted Answer

The average life span of the civilization is important to consider because civilizations may arise and collapse over time. If the average lifespan of a civilization is relatively short, it is less likely that we will overlap with them in time and therefore less likely that we will detect their signals or evidence of their existence.

When Considering the Number of Technologically Advanced Civilizations in Our