Does Time Slow Down in a Black Hole?

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Discussion Overview

The discussion centers around the effects of gravity in black holes, particularly the concept of time dilation and whether time could effectively stop within a black hole. Participants explore theoretical implications of black holes on mass and gravitational influence, as well as the nature of time in extreme gravitational fields.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that time could be perceived as slowed down in a black hole, questioning if this means the mass taken by the black hole is less than previously thought.
  • Others clarify that black holes vary in size and that their gravitational force acts on space rather than being influenced by space itself.
  • There is a suggestion that time dilation is already accounted for in the gravitational field as described by General Relativity.
  • One participant questions the premise of time stopping in a black hole, asking for clarification on what is meant by "it just takes longer."
  • Another participant emphasizes that changes in the gravitational field around a black hole propagate at the speed of light, which may relate to the discussion of time perception.

Areas of Agreement / Disagreement

Participants express differing views on the nature of time in black holes, with some supporting the idea of time dilation while others challenge the notion of time stopping. The discussion remains unresolved with multiple competing views present.

Contextual Notes

There are limitations in the clarity of certain statements, particularly regarding the implications of time dilation and the relationship between mass and gravitational influence in black holes. Some assumptions about the nature of black holes and their effects on time are not fully explored.

Redrocket
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It is stated that nothing can escape a black hole and they are gigantic and powerful enough to rotate a galaxy. The gravitational force of space acting on the black hole is immense. On this level of gravity could time it self be stopped in the black hole?

Therefore the amount of mass taken by the black hole could be a lot less then we think it just takes longer as time is slowed down.

Your thoughts…………
 
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Redrocket said:
It is stated that nothing can escape a black hole and they are gigantic and powerful enough to rotate a galaxy. The gravitational force of space acting on the black hole is immense. On this level of gravity could time it self be stopped in the black hole?

Therefore the amount of mass taken by the black hole could be a lot less then we think it just takes longer as time is slowed down.

Your thoughts………

My thoughts are that you put your question(s) in pretty unclear fashion, except for time slowing down, which is true for outside observer.

- Black holes are not necessarily gigantic. It is mass/volume ratio, or density, that qualifies region of space, occupied by that mass, to become a black hole.

- Mass is the one that causes gravity, not the space. But it is true that space - time is the "medium" through which gravity acts, so you can tell that space - time is the one who exerts "force" on a object.

- What do you mean by "Therefore the amount of mass taken by the black hole could be a lot less then we think it just takes longer as time is slowed down". It just takes longer for what?
 
Redrocket said:
It is stated that nothing can escape a black hole and they are gigantic and powerful enough to rotate a galaxy.
BHs come in all sizes. Some are small, some are huge and live at the centre of galaxies (they do not "rotate the galaxy" - galaxies will do just fine without them.)

Redrocket said:
The gravitational force of space acting on the black hole is immense.
It is the gravitational force of the BH that acts on space, not the other way around.

Redrocket said:
On this level of gravity could time it self be stopped in the black hole?
Why would it?

Redrocket said:
Therefore the amount of mass taken by the black hole could be a lot less then we think it just takes longer as time is slowed down.
The changes in the gravitational field around a black hole propagate at the speed of light.
 
mcampbell said:
It is stated that nothing can escape a black hole and they are gigantic and powerful enough to rotate a galaxy.
Er, well, not quite. The supermassive black holes at the centers of galaxies sound impressive, but they still only make up a tiny fraction of the total masses of the stars in galaxies.

mcampbell said:
Therefore the amount of mass taken by the black hole could be a lot less then we think it just takes longer as time is slowed down.
Well, time dilation is fully taken into account by the gravitational field predicted by General Relativity.
 

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