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Submission + - Astronomy Without A Telescope (universetoday.com)

Phoghat writes: "In what is starting to become a familiar theme, researchers have speculated on what types of observational data from distant planetary systems might indicate the presence of an alien civilization, in this case asteroid mining
it’s thought that indicators of the presence of an alien civilization might include:
Atmospheric pollutants, like chlorofluorocarbons – which, unlike methane or molecular oxygen, are clearly manufactured rather than just biogenically produced
Propulsion signatures – remember how the Vulcans detected humanity in Star Trek: First Contact
  Stellar engineering – where a star’s lifetime is artificially extended to maintain the habitable zone of its planetary system"

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Astronomy Without A Telescope

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