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  • Subject: Black hole physics question
Subject: Black hole physics question
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I know space and time are synomninous, but i forgot how exactly does a point of infinite gravity and infinitely small size (black hole) bend time?

I just watched a documentary that explained how when the universe was all inside an infinitely small point, it warped all of time so that time didnt exist before the big bang...

Or something along those lines.

Google didnt halp.

  • 12.16.2012 3:07 AM PDT

This should answer your question.

[Edited on 12.16.2012 3:15 AM PST]

  • 12.16.2012 3:09 AM PDT

In memory of those fallen in the defense of Earth and her colonies.

March 3, 2553

It bends light, so things appear as if they are static in space but in reality are not.

Short answer I guess.

  • 12.16.2012 3:14 AM PDT
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They look at the stuff that is being warped, and they do tons of math to define the location of the black hole.

  • 12.16.2012 3:19 AM PDT
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____________(˜˜˜||˜˜˜˜||˜˜˜˜˜)_∏______
l | --------____.`=====.-.~:________\___|================[oo]
|_|||___/___/_/~```|_|_|_|``(o)----------<)

Light is massless, yet attracted by gravity. This means that the very fabric of space is affected by gravity.

Since the closer to the speed of light you travel, the faster time (outside your travel) goes, Time and Space are thus linked by the same forces.

Black holes are objects with so much mass that the forces of gravity actually exceed the strength of the laws that bind matter in a shape. This allows the mass contained to be compressed into an infinitely dense ball of energy.

For something to be infinitely dense, it must break all the rules of quantum matter to exist within our universe. Therefore, the angle that spacetime bends to accomodate it must be equal to infinity. This allows the blackhole to "exist" within our universe while simultaneously "not exist" (because it is an infinite amount of time and space away).

To describe this with somewhat of a metaphor, a blackhole is something like the circular dish you will see at a science expo, where you can roll a ball around the outside and watch as it rolls around the center. It will slowly get closer to the center, before dropping in the hole at the bottom. The "hole" is actually the point where the "sides" of the hole become parallel.


In a black hole, that point is the Event Horizon. Once you've hit that point, absolutely nothing can escape. Across that point, all laws of physics as we know them are no longer relevant, and all objects are travelling in one direction, no matter which way they are trying to go. It becomes essentially, a two-dimensional universe, but it only exists in one dimension intervals.


Anyways, your original question was based on how Black Holes affect time. I have previously shown (very badly) that Space and Time are actually a part of one another. Together they form "Space-Time".

There is a class of measurement units known as "planck units". There are several of these, but I am mostly concerned with the planck length and the planck time.

A planck length is considered to be the smallest distance that is considered possible within the realm of our universe's physics.

A planck time is the time it would take for an object to travel, at the speed of light in a vacuum, the distance of one planck length. Since time is a measurement of change in state, and that in any less time, the object would have moved less than one planck length, it has not actually moved, has not changed state, and therefore no time has actually passed.


Now, having explained ALL OF THAT (for honestly no reason other than to talk about some stuff I find fascinating):

Since, as stated above, gravity can not literally attract light, but instead it bends space, light travels in curves because it is moving across a bent piece of space.

Now, think about the implications of what a bent piece of space means. Have you ever just lain down on a trampoline and stared at the mesh that is supporting you? Notice how the mesh that is being stretched has slightly larger "holes" between strands than the mesh near the edges of the trampoline, and ALL of those are larger than when nothing is on the trampoline.

The same principle applies to space time. The "planck lengths" are being stretched as the light travels on the curved space. Since the "planck time" is still derived from the same basic formula, you will hypothetically take "longer" to travel through that space, since it is taking an observably longer time to travel a universal-base distance.


This would therefore mean that, hypothetically, when you enter the Event Horizon and "Space-Time" becomes parallel, the thing entering it will continue on as it has forever, never really noticing a change in state, because you will take an infinite amount of time to travel one planck distance. Conversely, from the outside, the moment you enter the Event Horizon, an outside observer will be able to essentially judge you as having reached the epicenter of the blackhole, as since that single planck second required for you to reach the center (which, for you, is an infinite amount of time) has already passed.

Get it?

TL;DR: Gravity doesn't attract light. Gravity must therefore bend space. The closer to the speed of light something goes, the slower they travel through time. The speed of light being the key factor both, space and time must be connected. Therefore, high gravity == bent space and slow time.

  • 12.16.2012 4:24 AM PDT
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Posted by: Telec
Remember kids: when Uncle Delta tells you he has sweeties, he isn't lying.

Now get in the van.


The Black Chapter

all you need to know about Black Holes in one handy picture

[Edited on 12.16.2012 4:28 AM PST]

  • 12.16.2012 4:27 AM PDT

Never make me angry. I am a Hitman and I can easily find you and take you out.


Posted by: xyz4524
This should answer your question.


I just...

I'm the cneter of the Galaxy! >:D

  • 12.16.2012 4:47 AM PDT

Posted by: Alex Mac Kee
If pen­ises were planes Jimmy's mouth would be an airport


Posted by: DarkBen64
Don't punch a British kid, the queen'll come after you.

Posted by: Tibetz
Black holes are objects with so much mass that the forces of gravity actually exceed the strength of the laws that bind matter in a shape. This allows the mass contained to be compressed into an infinitely dense ball of energy.
Not necessarily, they just have a huge density so they cause a massive amount of space time curvature.

Infinite if you will.

  • 12.16.2012 4:52 AM PDT

Per Audacia Ad Astra

Infinite density.

Space and time are relative, so without one the other mustn't exist.

  • 12.16.2012 4:52 AM PDT

Why don't we just share the hill?


Posted by: xyz4524
This should answer your question.


Really enjoyed that, thanks for the link.

  • 12.16.2012 5:15 AM PDT


Posted by: bulldog534

Posted by: xyz4524
This should answer your question.


Really enjoyed that, thanks for the link.

Your welcome, I would also recommend checking out his other videos since they are just as or even more interesting.

  • 12.16.2012 5:18 AM PDT
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Don't send me group invites unless i know you. pl0x.


Posted by: seven blind mice
I know space and time are synomninous, but i forgot how exactly does a point of infinite gravity and infinitely small size (black hole) bend time?


Everything bends space-time to some degree.

  • 12.16.2012 5:21 AM PDT