In 1974,astronomers Sent a Message Toward Globular Cluster M13

question 18

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 48,000 years.Why not?

• 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.

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