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THE VIDEO SHELF · special relativity

The Speed of Light is NOT About Light

PBS Space Time argues that the speed of light is better understood as the speed of causality, the universal limit on how fast cause and effect propagate. Light travels at that speed because it is massless, but the limit itself is a property of spacetime.

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Why HN readers recommended it

HN commenters send people to it whenever a thread confuses the speed of light with a light-specific limit, and several say it deepened their understanding of relativity.

This is a summary from the source dataset, not an endorsement by Hacker News or the video creator.

Video & recommendation details

Creator / channel
PBS Space Time
Topic
special relativity
Format
explainer
Level
general
HN recommenders in dataset
8
HN mentions in dataset
15
Recommendation years in dataset
2017–2023

These counts and years describe the included Hacker News records; they are not YouTube views or the video’s publication date.

From the original HN conversations

Excerpts from the recorded comments. Follow each source for the full comment and surrounding discussion.

  • PBS SpaceTime has a treatise on relativity. There are a dozen videos worth watching on this topic alone. The video about “the speed of causality” is the one that caused me to level up: [VIDEO] Here is a 12 video playlist on relativity: [LINK] Here …

    willis936 on Hacker News · 2020-10
    In NIST Pair of Atomic Clocks Reveal Einstein's Relativity at a Personal Scale

  • There's an episode of PBS Space Time about this, "The Speed of Light is NOT About Light" [1], which comes pretty close to making the same points you are making. It might be useful to watch this earlier episode, "Are Space and Time an Illusion?" …

    tzs on Hacker News · 2020-11
    In Warp Drive News

  • These PBS Spacetime episodes should help: The Speed of Light is NOT About Light - [VIDEO] Is Quantum Tunneling Faster than Light? - [LINK] The Quantum Experiment that Broke Reality - [LINK] Pilot Wave Theory and Quantum Realism - [LINK] The Future of Gravitational Waves …

    neom on Hacker News · 2017-08
    In Rumours swell over new kind of gravitational-wave sighting

Summaries, classifications and recommendation records are from the HackerTube source dataset. Read about this library and its limitations.

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