From John Bailey, Farnborough, Hampshire, UK
Someone needs to caution Douglas Vakoch that he does not hold a democratic mandate to broadcast humanity's existence to potential threats. Some may scoff about the vast distances, but I am sure the Incas and Aztecs would have felt that Madrid was a long way away.
The editor writes:
• All the same, the argument that any being advanced enough to wage interstellar war will already know we are here is a strong one.
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