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.
A terraformed planet has been artificially made hospitable for life. The gases described in the study would be detectable even at relatively low concentrations in the atmospheres of planets outside our solar system using existing technology. This could include the James Webb Space Telescope, or a future European-led space telescope concept.
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