How Far Could Earth's Technosignatures Be Detected? A Multiwavelength Modeling Study for Current and Near-Future Observatories

To the point

A team modeled how far Earth-like civilizations could detect Earth's technosignatures with current technology and found that radio signals could be detected up to about 12,000 light-years, atmospheric signatures up to about 5.7 light-years with future observatories, and near-Earth observers would see multiple human-made traces such as city lights and satellites, providing a practical, multiwavelength framework for SETI that quantifies humanity's most detectable traces and guides search strategies, with Sofia Sheikh describing it as a cosmic mirror of how Earth would appear, Macy Huston stressing that searches should be grounded in today’s technosignatures, and Jason Wright noting that knowing detectability highlights productive search avenues.