Blackjack Ruby and Nimrod Cain, the moon is the color of a coffee stain


Sensitive new telescopes now permit astronomers to detect the waste heat that is expected to be a signature of advanced alien civilisations that can harness enormous energies on the scale of the stellar output of their own galaxy. Professor Michael Garrett has used radio observations of candidate galaxies to show that such advanced civilisations are very rare or entirely absent from the local Universe.

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