BASIC CALCULUS Physics of Black Hole - WHY WILL WE NEVER SEE ANYTHING ENTER A BLACK HOLE?

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In this video I will guide you a bit through general relativity, the Lagrange formalism and how to calculate stuff happening around a black hole.
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@20:00 Could you argue that 'observation' itself ends at the black hole? It seems like an added assumption to say the/a ship could still enter, even though the equation is going to zero. I've often wondered that if we truly believe the entirety of spacetime is ending at the black hole, then imagining/assuming things can go into it is like asking what happened before the Big Bang.

erawanpencil
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Keep making these videos man, great work!

ritviq
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Isn't this exactly backward because it only applies the relativity of the perspective of the object? From the perspective from earth would the object not do the opposite and disappear instantly from a distance quite far away from the event horizon as it "accelerates" to the horizon? The theory of relativity can surely applied differently from different perspectives in time tracks that are vastly different?

Yes the math checks out, but only from one relativity, not both.

MrLeetravels
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wow. best wishes for your future.. you doing great... ❤

_____lazie_
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My resolution to the information paradox is that no information has yet fallen through an event horizon, so there's no paradox to be resolved. But mention that on an astronomy forum, and you will not be a popular person. They like dropping things into black holes. Yeah, yeah, the spaceship crosses the event horizon in a finite proper time. But what does the external observer see during that process. He sees the stars in the universe run out of fuel and go dark, the universe continues to expand and cool, the black holes evaporate via Hawking radiation, before the infalling spaceship has crossed the event horizon. If the external observer sees the black hole disappear before the event horizon has been crossed, then the event horizon has not been crossed, even in the frame of the voyager. Even without the Hawking radiation thing, it seems like crossing the event horizon corresponds with greater than infinite coordinate time. I think something must be breaking down there.

greghansen
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quick question, im doing my final paper in highschool about black holes but i dont understand minute 10.31. You mentioned adding time dependence to an integral? and u do that by adding dt/dt, why is that? and what is its use?

nathanroovers
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beautiful video! I was like wth you mean it wont enter? I know from observer you will never see them cross the event horizon!! But the people in the ship will cross and not even know it! IIRC

Theantmang
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Because of the extreme time dilation, I always viewed black holes as like a "skip" button to the end of the universe.

hellofromhokkaido