Re: Inside a black hole
- From: "N:dlzc D:aol T:com \(dlzc\)" <N: dlzc1 D:cox T:net@xxxxxxxxxx>
- Date: Sat, 16 Jul 2005 17:11:09 -0700
Dear RichD:
"RichD" <r_delaney2001@xxxxxxxxx> wrote in message
news:1121555361.121796.184140@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Randy M. Dumse wrote:
>> > Does physics say anything about what happens after
>> > you cross the event horizon?
>>
>> Current theory is the horizon is no place special,
>> other than if you cross it, you're not coming back.
>
> I had the idea it's like an aircraft crossing the sound
> barrier, with all kinds of dramatic effects.
Probably not, except for the extreme blue shifted light "coming
up your tailpipes".
> Maybe someday there will be a "Right Stuff"
> book about the first pilots to cross the horion.
It will never be read by someone on the outside.
>> It is possible to change your position in angle
>> (\theta, \phi) but a stable orbit is not possible.
>> You will continue to approach the
>> singularity no matter what you do.
>
> So you can't orbit like a planet around the sun?
Far enough away, yes. But keep in mind that a BH tends to
comsume additional matter (depending on size), so you'll need to
keep boosting out a bit.
But Mr. Dumse was talking about inside the horizon, were r is
believed to become an internal t. Can you stop the passage of
time, and see the Universe as unchanging? This is what such an
"orbit" would entail.
>> Light you shine at the singularity gets there at the
>> speed of light. Light you shine away from the
>> singularity gets there at the speed of light. You are
>> somewhere in the middle of those two extremes,
>> and will get to the singularity after the one and
>> before the other.
>
> That's hard to visualize.
>
> Let's say I fire my thrusters so as to move away from
> the singularity. Space is curved, so I don't travel
> straight away from it. But I watch my rear view mirror,
> and continually make corrections to keep moving further
> out (toward the horizon).
>
> Why can't I do that?
Because once inside the event horizon, everything moves away from
"The Big Bang".
>> > Will you 'bump your head' on the event horizon?
>>
>> No, the horizon is (after all) moving away from
>> you at the speed of light. You can never regain it.
>
> hmmm, you mean, for an observer inside, the
> hole's outer surface appears to grow at the speed
> of light? Very strange.
Look at the CMBR. It is pretty close to the edge of
observability now.
Consider that *this* Universe could very well be the inside of a
BH. The mathematics describes the inside of a BH very much like
it describes the Universe around us. So where Mr. Dumse is
coming from is from this particular solution-set (I think).
>> > And how does angular momentum affect any of this?
>>
>> A rotating black hole drags space with it.
>
> I had in mind an object not falling straight through,
> but obliquely, like the space shuttle re-entering
> the atmosphere.
When all vectors point into the hole, what are niceities like
"oblique"?
>> Google on "inside black hole" and you will find
>> many write ups.
>
> Oh yes, the Web is a gigantic encyclopedia. Just
> Google anything, and learn everything!
>
> For instance, I Google "inside black hole", and get:
> http://www.school-for-champions.com/science/feedback.cfm?topic=Astronomy
>
> Then I click "Fall inside black hole" and learn:
> "Since the heat is so great, the object will
> disintegrate and burn up."
>
> What an education!
You might want to use advanced search, and concentrate on site
that have ".edu" in them. That will trim down the noise.
David A. Smith
.
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