Overview
- Researchers simulated technosignatures as light-speed emissions with varying durations and ranges to estimate how many would have intersected Earth.
- Under detection ranges of a few hundred to a few thousand light-years, the model implies an implausibly large number of past signals should already have crossed Earth unnoticed.
- The finding challenges the idea that decades of silence are chiefly due to weak instruments and points to low odds of advanced societies in our local galactic region.
- The study differentiates omnidirectional outputs, such as waste heat, from focused beacons or laser pulses, noting distinct detection hurdles for each.
- Authored by EPFL physicist Claudio Grimaldi, the work urges expanding survey distances by several thousand light-years while refining sensitivity, pointing, and signal discrimination.