Uploaded February 2026 | Updated September 2026, 2 weeks ago

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How interstellar relays could move data, cargo, and starships between stars using lasers, light sails, and cosmic-scale infrastructure.

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Credits:
Interstellar Relays - Moving Signals and Spaceships Between the Stars
Written, Produced & Narrated by: Isaac Arthur
Graphics from Bryan Versteeg, Fishy Tree, Jeremy Jozwik, Melänovis, Udo Schroeter
Music Courtesy of Chris Zabriskie & Stellardrone
Select imagery/video supplied by Getty Images

Chapters
0:00 Intro
6:38 How Far Can We Focus Beams?
16:00 Retighten the Beam versus Regenerate the Beam
18:49 Interstellar Bandwidth
20:31 Way Stations
24:27 Nebula
26:27 Deploying the Relays
27:26 Black Hole Relays