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Home Q & A Board Science-Related Homework Help Physics
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doit_the_clown doit_the_clown
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7 years ago
Suppose we were able to detect radio signals from an intelligent civilization in the Coma cluster of galaxies. If we were to send a message to this civilization, how long would it take for us to get a reply?
A)   600 million years   C)   75 million years
B)   150 million years   D)   300 million years
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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hyponoticahyponotica
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7 years ago
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doit_the_clown Author
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7 years ago
You make an excellent tutor!
dedricgard
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Yesterday
I appreciate what you did here, answered it right Smiling Face with Open Mouth
jamiebonf99
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2 hours ago
Correct Slight Smile TY
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