Multiple Choice
Approximately how soon might we expect an immediate response from a civilization that received the signal we sent to the globular cluster M13 (21,000 light-years away) in 1974?
A) 84,000 years
B) 21,000 years
C) 10,500 years
D) 42,000 years
Correct Answer:
Verified
Correct Answer:
Verified
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