The study explored how hidden #electromagnetic leakage might look to extraterrestrials up to 200 light-years from Earth, if they had state-of-the-art #radio #telescopes like our own. Theoretically, it also suggests this is how far we would be able to look to spot aliens who have evolved to use a similar level of technology.
https://www.spacedaily.com/reports/How_airports_like_Heathrow_and_Gatwick_could_help_aliens_spot_Earth_999.html

How airports like Heathrow and Gatwick could help aliens spot Earth
London, UK (SPX) Jul 11, 2025 - Radar systems used by civilian airports and military operations are inadvertently revealing our existence to potential advanced alien civilisations, new research shows. The study explored how