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The Geometry of Causality

PBS Space Time · explainer · Watch on YouTube

Fundamental physicsCosmology & astrophysics

What it is

PBS Space Time explains how spacetime geometry and light cones determine the order of events and what can cause what. It visualizes causality in special relativity.

Why Hacker News recommends it

Used as a go-to reference for relativity arguments, such as spacetime intervals being the same for all observers, and as a suggested follow-up for physics fans.

  • 2 people recommended it
  • 2 different months
  • 0 strong recommendations
  • first 2017, last 2022

What HN commenters said

  1. “here are some good ones around humans and the universe.”

    Part of a watch-in-order foundation list on quantum and cosmos

    neom, 2017-02 · Recommendation · in “Theories about a link between the human mind and quantum physics”

  2. “You may also like The Geometry of Causality”

    Suggested as a further related Space Time video

    shagie, 2022-08 · Recommendation · in ““I survived the TCP transition” (2013)”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: special relativity, light cones, spacetime, causality, physics

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