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What Happens at the Event Horizon? | Space Time | PBS Digital Studios

PBS Space Time · explainer · Watch on YouTube

Cosmology & astrophysicsFundamental physics

What it is

PBS Space Time explains what happens as you approach and cross a black hole's event horizon, using Penrose diagrams and light cones as the tool for understanding spacetime there.

Why Hacker News recommends it

Commenters call it a short, clean, visual explanation of the infalling-particle question and of Penrose diagrams.

  • 3 people recommended it
  • 3 different months
  • 1 strong recommendations
  • first 2019, last 2025

What HN commenters said

  1. “Here's a really excellent and short video which attempts to explain this in ten minutes.”

    Short, excellent ten-minute explanation of infalling particle at event horizon.

    speakeron, 2019-01 · Strong recommendation · in “Strangeness of Black Holes”

  2. “I think this is the cleanest explanation with actual visual representation.”

    Cleanest explanation with visual representation.

    me_me_me, 2020-10 · Recommendation · in “The Nobel Prize in Physics 2020”

  3. “PBS Space Time to the rescue”

    Event horizon explainer among PBS Space Time black hole videos.

    neom, 2021-05 · Recommendation · in “Physicists identify the engine powering black hole energy beams”

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

Topics: event horizon, penrose diagrams, light cones, general relativity, spacetime

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