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From: dn5@sdcc12.UUCP ({dn5)
Newsgroups: net.physics
Subject: Re: Re: "big bang" a big bust?
Message-ID: <127@sdcc12.UUCP>
Date: Sun, 2-Dec-84 16:35:13 EST
Article-I.D.: sdcc12.127
Posted: Sun Dec  2 16:35:13 1984
Date-Received: Tue, 4-Dec-84 06:29:19 EST
Organization: U.C. San Diego, Academic Computer Center
Lines: 21

> Light can't escape from within a black hole, but information can.
> 
> Two pieces of information escape from a black hole - its mass and angular
> momentum.  The mass can be found from the strength of its gravitational field.
> As I remember (from a physics lecture) the angular momentum can be found by
> sending a satellite around the black hole.  The satellite will return rotated
> as I recall, though I don't really understand why.  It probably has something
> to do with the curvature of space around the black hole.
> 
> It would seem that information transmission is not necessarily bound by
> the properties of light.  Any comments?
> 
> Arch - uiucdcs

It is true that information may be transmitted without concern for
the properties of electromagnetic radiation as there are other
forces in nature.  The question of the speed of information
exceeding c is left untouched by your example, however, since a
gravitational field must propogate at that velocity.

[jc]