Gravity's Magic

[David Morris]

So Black Holes are energy transformers?  Not gateways?  Sort of like evil
strars?  Suck in matter and spit out radiation?

I tried reading Hawking's HOT when it arrived. I got through about two
chapters, but I'm still thinking of them. I need to try at it again...

David Morris


On Thursday, May 10, 2012, Dipanjan Maitra wrote:

> No.Thanks a lot for that question though! It made me read that chapter
> again. What Hawking says is this:
>
> What happens when the mass of the black hole becomes extremely small is
> not quite clear, but the most reasonable guess is that it would disappear
> completely in a tremendous final burst of emission, equivalent to the
> explosion of millions of H-bombs.
>
> Hawking also says that when a mass 'falls' into a black hole, the mass of
> the black hole increases but the equivalent of that mass is returned to the
> universe in the form of radiation. so that if an astronaut falls he will be
> 'recycled'!
> Hawking also talks about entropy and the second law of thermodynamics in
> that chapter.
>
> On Thu, May 10, 2012 at 11:54 PM, Jude Bloom <jude at bloomradio.com<javascript:_e({}, 'cvml', 'jude at bloomradio.com');>
> > wrote:
>
>> 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 <javascript:_e({}, 'cvml',
>> '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<javascript:_e({}, 'cvml', '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<javascript:_e({}, 'cvml', 'fqmorris at gmail.com');>
>>> > wrote:
>>>
>>>> > From: Prashant Kumar <p.kumar at physics.usyd.edu.au <javascript:_e({},
>>>> 'cvml', '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
>>>>
>>>
>>>
>>>
>>> --
>>> www.innergroovemusic.com
>>>
>>
>>
>
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