Time Travel is Inevitable 91 replies

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LIGHTNING [NL]

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30th May 2003

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#81 11 years ago

Black holes have infinite density. If an object had infinite mass it would suck in the entire universe instantly.




conorlord

(< my guitar) Gold Thread FTW

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21st September 2007

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#82 11 years ago

not instantly but you are right




Maxa

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#83 11 years ago
'LIGHTNING [NL;4588552']Black holes have infinite density. If an object had infinite mass it would suck in the entire universe instantly.

...but infinite density demands either infinite mass or zero volume :).

Escape velocity from Sun is about 1/500 of c. If the mass of a star is much greater and it collapses under it's own gravity, so that it's radius gets much smaller, escape velocity can be over c. Then no light escapes it, and it bends light (and other electromagnetic radiation) that passes near it.

Escape velocity = square root((2 * G * mass)/radius).

Don't ask me if matter is somehow decomposed and atoms are broken once it collapses :lookaround:. But I think it should be obvious that black holes are theoretically possible.




LIGHTNING [NL]

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#84 11 years ago
Maxa;4588642...but infinite density demands either infinite mass or zero volume :).

Indeed - black holes have zero volume.




DawnOfDiablo666

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#85 11 years ago

Wow, I suprised how many people one this forun know about science and physics. I'm more of a medieval history person but, who needs to take science and physics in schools when all you need to do is read this thread :lol:.




Guest

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#86 11 years ago

You will fail physic's 101 if this is your text book, what you state is , well, re-donkulas !




LardButtTheCat

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#87 11 years ago

Omg Dexter, it was joke, god your such a asshole.




Mr. Pedantic

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#88 11 years ago
...but infinite density demands either infinite mass or zero volume smilie.gif.

A black hole has zero volume. Technically, the black hole can exist in two dimensions, but it has not depth - so its still zero volume.

and it bends light

Everything bends light.

Don't ask me if matter is somehow decomposed and atoms are broken once it collapses lookaround.gif

Matter is made up of fermions. Fermions cannot occupy the same quantum states as other fermions. Therefore, you should not be able to have an infinite density, simply because you can't have more than one proton/neutron in one place at any one time. So what happens to it?




Maxa

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#89 11 years ago

I stand corrected. Singularity... mmm. I should have known Lightning simply can't be wrong when it comes to physics :).

Once the body collapses to a critical radius, nothing can prevent it from collapsing further

I think I'll read more about this tomorrow, this seems quite interesting. Right now all I can think is infinite density -> infinite gravity (at the singularity) -> infinite time for matter to reach the singularity?




Guest

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#90 11 years ago

Look up supernova, it has some great explanations on stars dieing, we are discovering that, not as many black holes are out there as we thought, we are finding that, in more cases than not, that a collaping star is not going all the way to a total collapse to a quantum black hole, as we first presumed. Anyways it devles into the stuff your craving !