Re: Inside a black hole

Dear David A. Smith,

N:dlzc D:aol T:com (dlzc) wrote:
> Dear RichD:
> >> 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, so you'll need to
> keep boosting out a bit.

No, I meant after entering the hole, you can't orbit the singularity?

> But Mr. Dumse was talking about inside the horizon, where 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.

"r becomes t"?
What does this mean?

> > 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 if we're insude a black hole, that means there's
a singularity at the 'center' of the universe? Wouldn't
that violate the anisotropy of space?

> >> > 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"?

I can fire a bullet straight up, or at a 45* angle. The
vectors at which they strike the earth will have different
directions.

--
Rich

.

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