@LexClips

Lex Fridman Podcast full episode: https://www.youtube.com/watch?v=A6m4iJIw_84
Thank you for listening ❤ Check out our sponsors: https://lexfridman.com/sponsors/cv8801-sa
See below for guest bio, links, and to give feedback, submit questions, contact Lex, etc.

GUEST BIO:
Janna Levin is a theoretical physicist and cosmologist specializing in black holes, cosmology of extra dimensions, topology of the universe, and gravitational waves.

CONTACT LEX:
Feedback - give feedback to Lex: https://lexfridman.com/survey
AMA - submit questions, videos or call-in: https://lexfridman.com/ama
Hiring - join our team: https://lexfridman.com/hiring
Other - other ways to get in touch: https://lexfridman.com/contact

EPISODE LINKS:
Janna's X: https://x.com/JannaLevin
Janna's Website: https://jannalevin.com
Janna's Instagram: https://instagram.com/jannalevin
Janna's Substack: https://substack.com/@jannalevin
Black Hole Survival Guide (book): https://amzn.to/3YkJzT5
Black Hole Blues (book): https://amzn.to/42Nw7IE
How the Universe Got Its Spots (book): https://amzn.to/4m5De8k
A Madman Dreams of Turing Machines (book): https://amzn.to/3GGakvd

SPONSORS:
To support this podcast, check out our sponsors & get discounts:
Brain.fm: Music for focus.
Go to https://lexfridman.com/s/brainfm-cv8801-sa
BetterHelp: Online therapy and counseling.
Go to https://lexfridman.com/s/betterhelp-cv8801-sa
NetSuite: Business management software.
Go to https://lexfridman.com/s/netsuite-cv8801-sa
Shopify: Sell stuff online.
Go to https://lexfridman.com/s/shopify-cv8801-sa
AG1: All-in-one daily nutrition drink.
Go to https://lexfridman.com/s/ag1-cv8801-sa

PODCAST LINKS:
- Podcast Website: https://lexfridman.com/podcast
- Apple Podcasts: https://apple.co/2lwqZIr
- Spotify: https://spoti.fi/2nEwCF8
- RSS: https://lexfridman.com/feed/podcast/
- Podcast Playlist: https://www.youtube.com/playlist?list=PLrAXtmErZgOdP_8GztsuKi9nrraNbKKp4
- Clips Channel: https://www.youtube.com/lexclips

SOCIAL LINKS:
- X: https://x.com/lexfridman
- Instagram: https://instagram.com/lexfridman
- TikTok: https://tiktok.com/@lexfridman
- LinkedIn: https://linkedin.com/in/lexfridman
- Facebook: https://facebook.com/lexfridman
- Patreon: https://patreon.com/lexfridman
- Telegram: https://t.me/lexfridman
- Reddit: https://reddit.com/r/lexfridman

@sicknado

I find it amazing that I actually would see the day where I miss genuine YT comments. Oops- sorry.. was I allowed to say this Mr Algorithm?

@woopwoopiii

I got this with chatgpt/co-pilot: Imagine peering through a tachyon telescope, capable of detecting faster-than-light particles and warped spacetime structures. Instead of seeing just a black void, you'd witness a 3D sphere, but inside—hidden from ordinary perception—lies a collapsed whirlpool of 4D spacetime, swirling with fragmented timelines, gravitational echoes, and cascading futures.
Makes more sense now

@N3PTUN3SOUL

The way she explained “what” a black hole is. “More of a place than a thing” 

Made sooooo much sense….i could never really understand or comprehend exactly WHAT a black hole was
Her explanation…I can comprehend💯

@Age_of_Apocalypse

Wouldn't be great to live in a world where people are "civilized" enough to watch the WHOLE video and, then comment on it INSTEAD of wasting our time with empty comments.

By the way, I have watched the whole podcast with Janna Levin and it was a great podcast. 🙏😍

@darthnihilus511

She explains this brilliantly!! Thank you!

@buckanderson3520

If we were inside of a black hole then the inevitability of the singularity would orient the direction of time. Personally I believe that the interior of black holes is the expanding volume of space between all black holes. The difference between outside a black hole and inside might be arbitrary and just a matter of perspective.

@stephen8813

Isn’t a star nuclear fusion? Vs nuclear fission? (Thermo nuclear bomb)

@robertw.fuller3080

A wonderfully clear interview.

@Triangle_Storm

What if you added up all the surface area of all the black holes within any region contained by the cosmological horizon?
Would it be the same area?
As the expansion erases access to the outermost black holes, would that area still be the same as the sum of the shrinking ones that remain?
I feel dizzy and sick.

@Chris-gm4hk

Black holes are when matter returns to the substrate of infinity. Matter freed from bounds or containment becomes infinity.

@AEKerr

Very thought-provoking topics were covered in the whole discussion... But is it possible that we were purposely limited concerning our advancement to travel beyond the stars of our own Galaxy🤔

@papiyon_1

sooo nobody's gonna ask what they were texting eachother about at 4 in the morning, then giggling like 2 school children? ok I will!

@alex79suited

Thanks Janna. Peace ✌️ 😎.

@whatthecello42

Is it a sphere with a singularity at the center?

@neomonk5668

If black holes are no things … what collides for LIGO to detect?

@isaac.anthony

What is happening "between" the event horizon and the singularity?

@Triangle_Storm

At the instance of Spacetime, did it go from 0 dimensions straight to 4 dimensions, or did it build the dimensions in sequence?
If sequentially, then wouldn't there be an inherent "handedness" to spacetime?
Could that infer a gradient responsible for gravity/time?
I feel dizzy and sick.

@Gerar007

Wait but I thought that black holes could spit out stars . Sooooo how could they not affect what’s outside the event horizon. I feel like a black hole is a ripped in space where energy goes in and somewhat cleanses and comes out into more energy

@grand372

Did quantum fluctuations somehow produce inflation aka big bang?  
If so, maybe we are living in a strange rare version of nothingness?