Question

Suppose there are 8,000 civilizations broadcasting radio signals in the Milky Way Galaxy right now. On average, how many stars would we have to search before we would expect to hear a signal

Answer 1

Answer:

The answer is "$6.25\times 10^7$"

Explanation:

In this question, we assume that there are 500 billion stars in the galaxy.

So, the number of stars are:

$N =\frac{500 \times 10^9}{8000}$

    $=62,500,000\\\\=6.25 \times 10^7$