Suppose it turns out that one in 1 million stars has a planet that at some point in its history is home to an advanced civilization. Then the total number of civilizations that have arisen in our galaxy would be closest to ________.
A) 400,000
B) 40,000
C) 4,000
D) 400
E) 40

Question

Quizplus · Accepted Answer

The Milky Way galaxy is estimated to contain about 400 billion stars. If one in a million stars has a planet with an advanced civilization, then the number of civilizations would be 400 billion divided by 1 million, which equals 400,000.

Suppose It Turns Out That One in 1 Million Stars