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From: rimey@ucbvax.ARPA (Ken Rimey)
Newsgroups: net.physics
Subject: Re: A Queation Regarding Black Holes
Message-ID: <9818@ucbvax.ARPA>
Date: Sat, 10-Aug-85 11:55:53 EDT
Article-I.D.: ucbvax.9818
Posted: Sat Aug 10 11:55:53 1985
Date-Received: Mon, 12-Aug-85 06:21:09 EDT
References: <625@wdl1.UUCP>
Reply-To: rimey@ucbvax.UUCP (Ken Rimey)
Organization: University of California at Berkeley
Lines: 31

In article <625@wdl1.UUCP> jrm@wdl1.UUCP writes:
>	By definition, the gravitational feild of a black hole is so
> intense that not even light or other wavicles with velocity c can escape.

Yes.  By the way, quantum mechanics is not relevant to black holes unless
they are very very tiny.  Also, "wavicle" is not a real physics term.  Say
"particle".

> My understanding is that gravity propagates with velocity c. (I believe 
> this has been proven. Correct?)

Gravity waves propagate with velocity c.  Yes.

> Does this not imply that, at least as
> far as the outside universe is concerned, the black hole has no 
> gravitational feild?

No.

>	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?
> 			    .....
>				jrm@ford-wdl1

No.  Matter cannot escape, but matter outside is certainly affected by
the black hole's gravitational field.

					Ken Rimey