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How Time Becomes Space Inside a Black Hole | Space Time

How Time Becomes Space Inside a Black Hole | Space Time on HackerTube: recommended by 4 Hacker News commenters across 4 separate months, 2018–2025.

PBS Space Time

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A PBS Space Time episode explaining how space and time swap roles inside a black hole's event horizon. It is part of the channel's black hole series.

Why Hacker News recommends it

Recommended as the cleanest visual explanation of time and space switching roles past the horizon, and a gateway to the channel's black hole videos.

people recommended it
4
separate months
4
strong recommendations
1
discussed on HN
2018–2025
“I think this is the cleanest explanation with actual visual representation.”
— me_me_me, Oct 2020, in “The Nobel Prize in Physics 2020”

What HN commenters said

7 Hacker News comments link this video. Each one links back to its thread.

joemagDec 2018Strongly recommends

This is from PBS Spacetime series [1]. A fantastic channel, and they did a number of videos on black holes. [1] ▶ this video

in “Why Black Hole Interiors Grow Almost Forever” · View on HN

neomMay 2021Recommends

PBS Space Time to the rescue: What Happens at the Event Horizon? - [link] What’s On The Other Side Of A Black Hole? - [link] How Time Becomes Space Inside a Black Hole - ▶ this video The Black Hole Information Paradox - [link]

in “Physicists identify the engine powering black hole energy beams” · View on HN

me_me_meOct 2020Recommends

[link] I hope it helps. I think this is the cleanest explanation with actual visual representation. Edit: Sorry this one is even better. How Time Becomes Space Inside a Black Hole | Space Time ▶ this video

in “The Nobel Prize in Physics 2020” · View on HN

pmiller2Jul 2020Recommends

> ...at the same moment. As an aside, this is a rather funny phrase to be using about objects so massive that time and space actually switch roles inside their event horizons compared to the normal universe. I don't feel like I can explain it very well, but here is a video that does so: ▶ this video (Skip to about 5:15 for the good stuff.)

in “Astronomers claim to have seen the merger of two black holes within a third” · View on HN

smolderMay 2025Cites it

What happens inside a black hole is basically unknowable. We can only ponder the math which leads to ideas like space and time swapping roles once you cross the event horizon.[0] The only thing that comes out is hawking radiation, which is sort of like... half of nothing. [0] ▶ this video

in “ALICE detects the conversion of lead into gold at the LHC” · View on HN

zackmorrisApr 2022Cites it

Apologies for replying to my own post, but I should have included sources. Here is the best stuff I've found so far: [link] [link] [link] There is an episode of How the Universe Works (I think) where they talk about the multiverse looking like an infinite block of swiss cheese, and each black hole having a child universe inside with its own physics, sealed off from the parent universes. So we're in the black hole where the rules of physics allow us to exist to realize it. In other words, the multiverse used black holes to evolve the rules of physics until consciousness could exist. It's another interpretation of the anthropic principle so isn't really testable, but I thought it was elegant. Wish I could find it. Edit: some places to start: ▶ this video [link]

in “What keeps earth from collapsing in on itself? (2010)” · View on HN

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dsnuhOct 2018Cites it

I just realized I was replying to the wrong parent comment! So sorry. I was talking about a PBS Space Time episode on YouTube I saw in (or came across via) a different comment. ▶ this video

in “Are Black Holes Actually Dark Energy Stars?” · View on HN

Topics & tags

Cosmology & astrophysicsFundamental physicsblack holesevent horizongeneral relativityspacetimepbs space time