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Earth Detecting Earth
Could a twin Earth detect Earth? February 3, 2025, Mountain View, CA – A research team led by Dr. Sofia Sheikh of the SETI Institute, in collaboration with the Characterizing Atmospheric Technosignatures project and the Penn State Extraterrestrial Intelligence Center, set out to answer a simple question: If an extraterrestrial civilization existed with technology similar to ours, would they be able to detect Earth and evidence of humanity? If so, what signals would they detect, and from how far away?
Atmospheric technosignatures—such as nitrogen dioxide emissions—have become more detectable than they were a decade ago, thanks to advances in instruments like the James Webb Space Telescope and the upcoming Habitable Worlds Observatory (HWO). SETI scientists search for advanced alien civilizations by looking for signs of technology -- signals or patterns that cannot be explained by natural phenomena that may indicate intelligent life. Repeating this type of study over the years as astronomical technology advances and the human impact on the planet evolves could provide fresh insights and refine our approach to discovering extraterrestrial life.
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