Gravity's Magic

[Dipanjan Maitra]

I'm not sure. They might be. I think Hawking talks about black holes, worm
holes and time travel in *The Universe in a Nutshell*.

On Fri, May 11, 2012 at 7:15 AM, David Morris <fqmorris at gmail.com> wrote:

> 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> 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> 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
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> www.innergroovemusic.com
>>>>
>>>
>>>
>>
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