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Suppose Astronomers Were Able to Detect Radio Signals from an Intelligent

Question 196

Multiple Choice

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

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