Suppose astronomers were able to detect radio signals from an intelligent civilization in the Coma cluster of galaxies. If they were to send a message to this civilization, how long would it take to get a reply?
A) 600 million years
B) 150 million years
C) 75 million years
D) 300 million years

Question

Quizplus · Accepted Answer

The Coma Cluster is approximately 300 million light-years away from Earth. Therefore, a message sent to the Coma Cluster would take 300 million years to reach its destination, and an equal amount of time for the reply to return, totaling 600 million years.

Suppose Astronomers Were Able to Detect Radio Signals from an Intelligent