Gravity's Magic

[Jude Bloom]

But his point is that they don't 'disappear,' right? They slowly radiate out all the stuff taken in. Or am I remembering wrong.



On May 10, 2012, at 12:48 PM, Dipanjan Maitra <dipanjan.hauntedinkbottle at gmail.com> wrote:

Hawking in fact argues that black holes can disappear thanks to what he calls 'Hawking Radiation'. It's in that chapter called 'Black Holes Ain't so Black' of A Brief History of Time.  

On Thu, May 10, 2012 at 10:49 PM, Keith Davis <kbob42 at gmail.com> wrote:
If matter is being sucked into black holes, and the universe is expanding, the matter must be coming back out somewhere, or new matter is being produced, or the matter present must be "thinning out".

Anybody have any answers?


On Thu, May 10, 2012 at 11:15 AM, David Morris <fqmorris at gmail.com> wrote:
> From: Prashant Kumar <p.kumar at physics.usyd.edu.au>
>
> Subject: Re: Gravity's Magic
>
> That's what a singularity is. A point in space in which the force due to gravity is infinite.

I trust Prashnat knows whereof he speaks, even though the concepts are
difficult to follow, probably partly due to the limits of terminology.

I've always wondered about the limits of black holes.  I take it some
are larger than others (or am I wrong?).  So that implies infinite
gravity contained within a physically limited size, right?  I ask,
because I've never been able to understand why all the cosmos hasn't
been engulfed by the first black hole that popped into existence.  Why
isn't the Universe contracting into a black hole instead of continuing
to expand?

Probably way to complex for a simple answer...

David Morris



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