[Metric]

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Metric,

Wouldn't very distant galaxies be too early in the lifetime of the universe to make this likely? At that epoch those galaxies should be too metal poor for the evolution of high technology civilizations.

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Very good point... I bet it would be easy to draw an effective distance limit for this -- no need to look out any farther than you could see a majority of late-generation stars that have themselves been burning for several billion years.