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The Eridanus Void: Is It a Monster Black Hole


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#16    pbarosso

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Posted 27 May 2010 - 08:33 AM

what? the bigger the black hole the larger the event horizon? that doesnt even make sense. you would be torn to shreds no matter what. it would still compact you and galaxies into elementary particles and it wouldnt take longer. the event horizon is like a line where the parts of you that enter it first are torn off of you. sure time would stand still in the event horizon but not for anyone watching. they would see you ripped to shreds layer millimeter by millimeter. and time would slow the closer you got to it for you but not for anyone watching. relativity.

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#17    pbarosso

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Posted 27 May 2010 - 08:35 AM

also i was thinking about that paragraph that states the huge black hole would gobble everything up and then just exist as a huge singularity in a giant void. but would it?

wouldnt it be more likely to be a singularity with time-space curved so severely that there would be no 3 dimensions outside of the singularity?

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#18    sepulchrave

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Posted 27 May 2010 - 09:32 AM

View Postpbarosso, on 27 May 2010 - 08:33 AM, said:

what? the bigger the black hole the larger the event horizon? that doesnt even make sense.
I'm not sure what you think you know about black holes, but the event horizon is the ``size'' of the black hole. In the simple, non-rotating case the radius of the black hole's event horizon is proportional to the mass of the black hole.

View Postpbarosso, on 27 May 2010 - 08:33 AM, said:

you would be torn to shreds no matter what. it would still compact you and galaxies into elementary particles and it wouldnt take longer. the event horizon is like a line where the parts of you that enter it first are torn off of you.
Eventually you would be compacted. The event horizon is simply the point of no return.

Sure, if you let half your body cross the event horizon and had your upper half attached to something that could instantly pull you back with a ridiculous amount of force you would get ripped in half (of course even if you weren't near a black hole a ridiculous force suddenly applied to half of your body might still rip you in half).

If you are free-falling into a black hole the thing that rips you apart are tidal forces, i.e. the difference between the pull of gravity at your feet and at your head. Although the gravitational force near the event horizon of a supermassive black hole is large, the gradient of this force can easily be mild enough that it won't rip you apart.

View Postpbarosso, on 27 May 2010 - 08:33 AM, said:

sure time would stand still in the event horizon but not for anyone watching. they would see you ripped to shreds layer millimeter by millimeter. and time would slow the closer you got to it for you but not for anyone watching. relativity.
Actually the opposite is true. A person will fall into a black hole in finite proper time, but to an outside observer it will look like they never cross the event horizon. This is because the closer you are to the event horizon the longer it takes the light from you to escape to reach the outside observer.

In this, as in many things, Wikipedia is your friend.





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