In 1974, Astronomers Sent a Message Toward Globular Cluster M13

question 15

Multiple Choice

In 1974, astronomers sent a message toward globular cluster M13. If life exists there, and it returns our signal, we won't receive it for at least another 44,000 years. Why?

• A) It will take that long for the space probe carrying our signal to reach the life forms there.
• B) Based on the age of the stars in M13, we anticipate it would take that long for a civilization to evolve enough to interpret and respond to our signal.
• C) M13 is far enough away that even light takes a very long time to reach it.
• D) It will take that long before our Solar System and M13 are properly aligned again.
• E) The universe will have expanded substantially after M13 receives our message, therefore taking much longer for their response to make it back to Earth.

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