We need a plan if we find we’re not alone

10 June 2021 - 05:06If humanity ever receives authentic signals from an alien civilisation, should it respond? The question is not too preposterous to consider.

If we do actually hear from an alien civilisation, should we send a message back? Stay silent? This issue has stirred argument among scientists, as any other civilisation would most likely be far more advanced than our own. Some scientists urge sending out signals to initiate contact now; others think that’s far too risky. But this really shouldn’t be a decision for scientists alone — the entire world should be involved.

Meanwhile, scientists have not stopped searching for alien signals. SETI researchers look for signals that seem to have no natural origin, such as radio waves of precise frequency. So far, after some 60 years, they’ve found nothing. And this failure has some scientists pushing for a more active approach known as METI, or Messaging Extraterrestrial Intelligence.

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