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From: chas@gtss.UUCP (Charles Cleveland)
Newsgroups: net.physics
Subject: Re: A Queation Regarding Black Holes
Message-ID: <132@gtss.UUCP>
Date: Mon, 12-Aug-85 10:31:24 EDT
Article-I.D.: gtss.132
Posted: Mon Aug 12 10:31:24 1985
Date-Received: Wed, 14-Aug-85 00:16:35 EDT
References: <625@wdl1.UUCP>
Reply-To: chas@gtss.UUCP (Charles Cleveland)
Organization: Georgia Tech Surface Studies
Lines: 36

Summary:

In article <625@wdl1.UUCP> jrm@wdl1.UUCP writes:
>
>/***** wdl1:net.astro.expert / jrm /  1:03 pm  Aug  6, 1985*/
>
>	A common science fiction theme is that of a ship orbiting
> a black hole under intense gravitational and tidal forces. Another is
> a ship falling into a black hole (usually with discussion of the
> relativistic effects).
>	However....
>	By definition, the gravitational feild of a black hole is so
> intense that not even light or other wavicles with velocity c can escape.
> My understanding is that gravity propagates with velocity c. (I believe 
> this has been proven. Correct?) Does this not imply that, at least as
> far as the outside universe is concerned, the black hole has no 
> gravitational feild?
>	Further, since everything with velocity <=c is kept within
> the black hole, does this not mean that the black hole is undetectable?
> Even to the extent that you could pass through one or it could pass
> through you and neither would know anything had happened?
>	Does quantum mechanics affect this? (In terms of "things"
> escaping from the black hole.)
>				jrm@ford-wdl1
>
>/* ---------- */


Silly me, I forgot to add "Black Hole" to my kill file for net.physics,
and inadvertently read this.  I'll add it now.  Keep your fingers crossed--
I don't know if it can hold another one. :-)

-- 
Charles Cleveland			 Georgia Tech Surface Studies
Georgia Tech School of Physics
Atlanta, GA 30332
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