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# Black holes

i want to know that why can't we stay alive in black holes???????? there is no time in black hole so how can a person die rather he should be immortal!!!!

Note by Heli Trivedi
4 years, 9 months ago

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ok, I'm going to chime in here because there are some misconceptions floating around. A black hole is a region of space where no object can escape from. The surface of the black hole is called the event horizon - for the simpler kinds of black holes the easiest picture is just a two-dimensional sphere in space. Nothing can escape, hence the name black hole. For large black holes you can have a picnic as you pass through the event horizon as nothing bad will happen to you there. Hence it is untrue that at the event horizon you will necessarily be spaghetti-fied. Where you get spaghetti-fied depends on the mass and size of the black hole - for solar mass black holes it's outside the horizon, for supermassive black holes it's inside.

Must you eventually get spaghetti-fied? To answer this question, we need to know a little more about the interior structure of a black hole. At the center of the black hole, if we stick to Einstein's theory of general relativity, is what's called a singularity, which is a point at which the theory breaks down. If you get close enough to the singularity then you will be spaghetti-fied eventually as nearby the singularity the "tidal forces" on your body (which occur due to how the gravitational field changes with position) diverge. Therefore the tidal forces will overcome any force keeping your body together.

Now, one can ask whether or not you have to get to the singularity. The answer is yes. Once inside the event horizon, you'd have to go faster than the speed of light to avoid hitting the singularity. Everything inside the horizon eventually meets the singularity. What is also important is that if you were inside a black hole you would hit the singularity in a finite number of ticks on your watch - i.e. you can't somehow postpone your demise to the infinite future.

Now one can live forever inside wormholes, which could look like a black hole to us. In those cases you could zip past the horizon and come out the other side of the wormhole in a finite number of ticks on your watch. However, I'd recommend saying goodbye to friends and family, as you'd wind up coming out in a different universe, unable to get back to where you came from.

Staff - 4 years, 9 months ago

thanks for clearing my misconception............

- 4 years, 9 months ago

To put it simply, even if time did stop at the singularity of a black hole, you'd be dead long before you got there, you'd have died from spaghettification (yes, that is a word) before you even reached the event horizon.

- 4 years, 9 months ago

The problem with black holes is the massive gravitational field gradient as you begin to approach. Unlike Earth, where the gravitational field is roughly constant on the surface regardless of where you stand or your elevation, a black hole's gravitational pull on any body increases in magnitude by 10^12 (approximately) as you move a meter towards it. That means if your head weighs 10 pounds, a meter down from your head the black hole pulls with around 10^13 pounds of force. There's absolutely no way any man, or man made material can survive that kind of force. Moreover, physics to date has no idea what happens inside an event horizon, and we may not have any idea for the foreseeable future. There can only be speculation, really.

- 4 years, 9 months ago

- 4 years, 9 months ago

there not only way to die .......naturally..........what will happen to a human who ripped and become long noodele.......definetely he will die thats what happens inside a black hole .........due to very strong gravity at very least distance from black hole even individual atoms can get separated..............

- 2 years, 10 months ago

According to general theory of relativity space and time are inextricably interconnected so that you cannot curve the space with invloving time.Hence concept of time totally depends on concept of matter further time is slow near a strong gravitational field hence the time stops at the singularity of a black hole so you cannot define the concept of matter at there so the is no question of staying alive.If you go there you will be changed into high energy particles.The loss of information in a black hole may reduce our ability to predict the future

- 4 years, 9 months ago

when u get close to a black hole, its gravity is so strong that it is different on your foot and different on your head. if your head weighs 1 kg there, your feet would weigh 10^{13} kg which is a great deal. In such a conditions, you won't only disintegrate into atoms but also your atoms would disintegrate. You are quite correct that if there is no time in black hole, one who reaches there should be immortal but one mistake is that if somebody reaches there. One would disintegrate into subatomic particles even before you reach event horizon. So, you would not be able to enter the black hole in whole, instead you would die as your subatomic particles will disintegrate.

- 4 years, 9 months ago

spaghettification!

- 4 years, 9 months ago

Because the black hole breaks you down and sucks you into its singularity.

- 4 years, 9 months ago

well, black holes are dead stars that got so much gravity it collapses under itself. It literally sucks up anything and everything we know; even light an't escape. So time or no time, our body would get WAY too overstretched we simply would die. I know, stating the obvious, but hope this helps ? :)

- 4 years, 9 months ago

How can u say that getting overstreched means that u cannot survive??? And talking abt time I would lyk 2 ask u that if there is no time then our body's mechanism would stop(mostly)!! And so u can be immortal......

- 4 years, 9 months ago

Our body is not malleable...if our skull, for example, breaks and collapses in, wouldn't that kill us?and if our body stops, then isn't that a euphemism for dead? I mean, not saying yours is wrong or I'm arguing something. But I see what you mean, and black hole is a difficult topic, cause much of it is still to discover; besides, I read another book that argues that you COULD theoretically survive being overstretched....

- 4 years, 9 months ago

ya i think u r write there can be many possibilities........ well thanks for guiding!!!!!!!!!

- 4 years, 9 months ago

A novel forms in my brain...

A bunch of scientists in a highly technological civilization that could achieve high amounts of energy sends people across a black hole, but the people die and are turned into UnDead...

- 4 years, 6 months ago

But are there any substances that sustain life in the black hole?

- 4 years, 9 months ago

I think that as any object gets closer to the black hole, the force of gravity also compresses atoms together, eventually leading to the disintegration of the atoms into its subatomic particles.

- 4 years, 9 months ago

what do u mean by substances? it should be possible that at least we should be able to stand but according to some scientists it is not possible either.........

- 4 years, 9 months ago

Essential elements that sustain life. Black holes also suck these because they suck everything and breaks them down. And so, it is impossible to sustain life.

- 4 years, 9 months ago

Black holes are the only objects in the universe that can absorb the Planck energy... Amazing :)

- 4 years, 6 months ago