On Sun, 8 Oct 2017 12:45:49 -0700 (PDT),
mitchr...@gmail.com wrote:
>On Sunday, October 8, 2017 at 9:31:59 AM UTC-7, Lofty Goat wrote:
>> On Thu, 5 Oct 2017 21:01:42 -0700 (PDT),
pnal...@gmail.com wrote:
>>
>> >What unstable orbit? What makes you think that the matter in an accretion disk is in an unstable orbit? Do you know something the rest of us don't know?
>
>It is claimed to spiral in...
>That is not a real motion curve from gravity.
>
>> Google is everyone's friend. <snip>
[sigh] "Motion curve from gravity?"
I have a friend who was pontificating once, years ago, about "ascending
hierarchies of functions". When I finally was able to pry a semi-lucid
description out of him, it was something which math types refer to as a
"family of curves". When he learned they were commonplace, and that
there was already a word for them, he calmed down a lot.
Gravity. Hmmm. A black hole's accretion is pretty complex.
Both tidal and thermal effects stress the matter in them far past their
elastic limit, so there isn't much in there that's solid no matter what
the material started out as, and indeed there is probably a lot of
plasma revolving around, adding electrical effects as well.
Space just inside the inner rim of the disc is rotating.
The particles which make up the disc are not just orbiting the primary,
they're also banging into each other. Other matter which happens to be
floating by is pulled into the disc, some going into not-quite-circular
orbits around the primary, complicating, among other things, the thermal
and electrical effects.
Some matter escapes back into space. Some drops inside the nearest
stable orbit and is eaten by the black hole. Some is blasted out
perpendicular to the disc by electromagnetic effects.
Sure, gravity plays a big part, but there are a hell of a lot of other
things going on there also.
Instead of pointing openmouthed at the phenomenon and saying, "Golly,
that just can't be!" you should perhaps ask a physicist. There are a
couple or three hanging about here who know a hell of a lot more about
this than I do, and could probably explain it to you a hell of a lot
better than I could. Ask, then pay attention.
--
Goat