Why Was the Globular Cluster M13 Selected as the Target

question 75

Multiple Choice

Why was the globular cluster M13 selected as the target for the 1974 Arecibo message?

• A) globular clusters are the most likely place to find stars with planetary systems
• B) stars in globular clusters are rich in heavy elements, the building blocks of life
• C) signals from advanced civilizations have previously been detected coming from this cluster
• D) globular clusters are densely packed with stars, hence maximizing the probability of interception by an advanced civilization

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