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Study Reveals Rarity of Type III Radio Broadcasts

10/10/2025

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Summary

Story summary

The study constrains artificial radio broadcasts at 1.4 GHz using prior methods to bound artificial radio galaxies.
It finds Kardashev Type III broadcasts fewer than 1 in 10^17 stars.
Observations of Messier 31 (M31) and Virgo cluster galaxies reveal confusion limits hindering detection.
Combined bounds limit to fewer than ~10^6 broadcasts per star per gigahertz, including gamma-ray, neutrino, and gravitational-wave broadcasts.

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Story summary

The study constrains artificial radio broadcasts at 1.4 GHz using prior methods to bound artificial radio galaxies.
It finds Kardashev Type III broadcasts fewer than 1 in 10^17 stars.
Observations of Messier 31 (M31) and Virgo cluster galaxies reveal confusion limits hindering detection.
Combined bounds limit to fewer than ~10^6 broadcasts per star per gigahertz, including gamma-ray, neutrino, and gravitational-wave broadcasts.