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Re: Can a black hole feed more than once?!

Subject: Re: Can a black hole feed more than once?!
From: Oxidized
Date: Mon, 12 Sep 2005 11:48:51 -0400
Newsgroups: sci.astro.seti, sci.astro, sci.physics.relativity, rec.arts.sf.science
Ben Bradley wrote:
In
sci.astro.seti,sci.astro,sci.physics.relativity,rec.arts.sf.science,
On Fri, 09 Sep 2005 17:34:24 -0700, Erik Max Francis <max@xxxxxxxxxxx>
wrote:


Rob Dekker wrote:


{ snip calculations }


So we should be (by definition) in a black hole...

Except we're not, because the Universe is expanding. The Universe appears open, and furthermore the expansion appears to be accelerating. Saying that "by definition" we're in a black hole only makes sense if you're making some useless semantic distinction, rather than talking about the actual physical properties of a black hole.


   Presuming for a moment that we ARE in a big black hole, why are we
not compressed into an infinitesimal point at its center?


The "gravastar" theory posits that black holes are in the shape
of a "bubble", and not a "point".

see: http://www.answers.com/topic/gravastar

From the article:

In astrophysics, the Gravastar theory is a proposal by Emil Mottola and Pawel Mazur to replace the black hole. Instead of a star collapsing into a pinpoint of space with virtually infinite density, the gravastar theory proposes that as an object gravitationally collapses, space itself undergoes a phase transition preventing further collapse, being transformed into a spherical void surrounded by a form of super-dense matter.

...

According to the theorizers Emil Mottola and Pawel Mazur the universe itself could very well be the inside of a giant gravastar.

...

Oxidized

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