why time stops after entering in black hole
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Gravity warps time. Black holes are basically massive gravitational bodies. Hence, they warp time quite a lot. The manner and extent to which time dilates
for observers at various distances from a gravitating mass is specified by the general theory of relativity.
Gravity slows time. One way to think about this is to consider two identical clocks, one close to a gravitating mass (call it the near-clock) and another that is far away (the far-clock). Basically, the near-clock ticks slower than the far-clock. In other words, an observer in the reference frame of the far-clock observes events closer to the near-clock to have slowed down. Note that, this is only a relative statement of how the clocks compare against each other. None of the observers notice a difference in their own respective observation frames. Their individual local experience of time is as normal as we experience time everyday.
Near a black hole, time slows down significantly. There is a point near the black hole below which time has practically stopped to an outside observer. This is what is known as the 'event horizon', a point beyond which not even light can escape. In fact, an outside observer will watch a falling observer taking an infinite time to reach the event horizon. On the other hand, an observer falling into a black hole does not notice any of these effects as she crosses the event horizon (as I stated above, local experience of time is normal). According to her own clock, the falling observer crosses the event horizon after a finite time without noticing any singular behavior. Also, she cannot really know when exactly she crosses the event horizon.
This is the manner in which black hole affects time measurements of local observers, at various points near the black hole. The key is to understand that, time is not an absolute measure uniformly applicable to all observers. It is relative to an observer's velocity and experience of gravity. Relativity shows us how these observations compare to each other. When you geometrically represent the time and space measurements (coordinates) for both the observers, one can actually see that points composing flat planes in one observer's frame transform into curved spaces in the other. This is what is popularly referred to, as the 'warping' of spacetime.
So, basically, a black hole warps spacetime a hell lot more than smaller gravitating bodies.
Hope that answers your question.
This was my sis's assignment...
LOL
for observers at various distances from a gravitating mass is specified by the general theory of relativity.
Gravity slows time. One way to think about this is to consider two identical clocks, one close to a gravitating mass (call it the near-clock) and another that is far away (the far-clock). Basically, the near-clock ticks slower than the far-clock. In other words, an observer in the reference frame of the far-clock observes events closer to the near-clock to have slowed down. Note that, this is only a relative statement of how the clocks compare against each other. None of the observers notice a difference in their own respective observation frames. Their individual local experience of time is as normal as we experience time everyday.
Near a black hole, time slows down significantly. There is a point near the black hole below which time has practically stopped to an outside observer. This is what is known as the 'event horizon', a point beyond which not even light can escape. In fact, an outside observer will watch a falling observer taking an infinite time to reach the event horizon. On the other hand, an observer falling into a black hole does not notice any of these effects as she crosses the event horizon (as I stated above, local experience of time is normal). According to her own clock, the falling observer crosses the event horizon after a finite time without noticing any singular behavior. Also, she cannot really know when exactly she crosses the event horizon.
This is the manner in which black hole affects time measurements of local observers, at various points near the black hole. The key is to understand that, time is not an absolute measure uniformly applicable to all observers. It is relative to an observer's velocity and experience of gravity. Relativity shows us how these observations compare to each other. When you geometrically represent the time and space measurements (coordinates) for both the observers, one can actually see that points composing flat planes in one observer's frame transform into curved spaces in the other. This is what is popularly referred to, as the 'warping' of spacetime.
So, basically, a black hole warps spacetime a hell lot more than smaller gravitating bodies.
Hope that answers your question.
This was my sis's assignment...
LOL
shaily9:
bhai net pe bada jaldi search kr liye hahahaha
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