It can be hard to hear a signal 100 miles away—so what does it take to build a beacon loud enough to be heard 100,000 light years away? In this episode, we explore galactic beacons: powerful transmissions that may teach, warn, or outlast the minds that made them.

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Credits:

Galactic Beacons: Teaching Tools or Tombstones? 

Episode 496a; April 27, 2025

Written, Produced & Narrated by: Isaac Arthur

Graphics: Darth Biomech, Jeremy Jozwik, Ken York YD Visual, Sergio Botero

Select imagery/video supplied by Getty Images

Music Courtesy of Epidemic Sound http://epidemicsound.com/creator

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