Earth's Technosignature Footprint: Everyday Signals, Pollution, Lasers, and Satellites That Could Reveal Us to Distant Observers
To the point
Dr. Sofia Sheikh and Dr. Simon Steel of the SETI Institute explain that Earth’s technosignatures—from everyday radio and optical signals to pollution and space objects—could be detectable by distant observers, but visibility depends on signal strength, narrowness, direction, and light-time delays, and will evolve as technology and energy use change.
