If aliens modified a planet in their solar system to make it warmer, we'd be able to tell. A new UC Riverside study identifies the artificial greenhouse gases that would be giveaways of a terraformed planet.
Detecting intelligent life that's light years away: Greenhouse gases could signal alien activity retrieved 25 June 2024 from https://phys.org/news/2024-06-intelligent-life-years-greenhouse-gases.html
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