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JL
Janna Levin
05/05/25
@ Lex Fridman
The event horizon of a black hole is a boundary beyond which nothing can escape, not even light. It's a point in spacetime that separates events that can affect an outside observer from those that cannot.
Video
LF
Janna Levin: Black Holes, Wormholes, Aliens, Paradoxes & Extra Dimensions | Lex Fridman Podcast #468
@ Lex Fridman
05/05/25
Related Takeaways
JL
Janna Levin
05/05/25
@ Lex Fridman
Inside the event horizon, the nature of space and time changes dramatically. As an object falls into a black hole, it experiences time differently, with their future leading them inevitably to the singularity, which is a point in time rather than space from their perspective.
LS
Leonard Susskind
12/07/18
@ Y Combinator
The information that falls into a black hole is stored on its horizon in a way that cannot be easily reconstructed, resembling a hologram rather than a photograph.
JL
Janna Levin
05/05/25
@ Lex Fridman
The experience of falling into a black hole varies with its size. For larger black holes, the curvature of spacetime is less noticeable, making the crossing of the event horizon less dramatic compared to smaller black holes, where the effects are more pronounced.
JL
Janna Levin
05/05/25
@ Lex Fridman
The information paradox arises because if a particle is created just outside a black hole's event horizon, and one falls in while the other escapes, the one that falls in becomes real and cannot return to the vacuum, leading to a loss of information.
LS
Leonard Susskind
12/07/18
@ Y Combinator
To reconstruct the information from a black hole's horizon, one would need to shine the right kind of light on it, similar to how a hologram works, but this process is not straightforward and requires advanced technology.
JL
Janna Levin
05/05/25
@ Lex Fridman
When observing Hawking radiation, one can notice entanglement between the radiation and the interior of a black hole, indicating that information is not lost.
JL
Janna Levin
05/05/25
@ Lex Fridman
The black hole's interior might be quantum entangled with Hawking radiation outside, allowing for information retrieval without physically moving it from inside to outside.
JL
Janna Levin
05/05/25
@ Lex Fridman
Black holes curve space and time around them, creating a gravitational field that affects the movement of objects nearby. When two black holes orbit each other, they create waves in the shape of space that follow their movement, eventually merging into a larger black hole that emits gravitational waves as it settles down.
LS
Leonard Susskind
12/07/18
@ Y Combinator
The holographic principle suggests that the information falling into a black hole can be thought of as both falling in and being stored on its horizon.