🚀 go-pugleaf

In article <ARI.HUTTUNEN.92Jul19015723@wonderwoman.hut.fi>, Ari.Huttunen@hut.fi (Ari Juhani Huttunen) writes:
> A light ray emitted at the event horizon can never escape the black hole.
> A light ray emitted an infitinitely small distance outside the event horizon
> will take an infinitely large time to reach an observer far away.
> 
> I interpret this to mean that at the event horizon time goes infinitely
> slowly relative to an outside observer.
> 
> Now, when a star collapses to a black hole and the star approaches the
> status of a "black hole", time will go more and more slowly relative to
> an outside observer. 
> 
> Thus, no matter when the collapse of a star began, it cannot have yet
> reached the state of a "black hole", since an infinitely long time required
> to form a black hole has not yet gone by. 
> 
> Also, if indeed the time goes infinitely slowly at the event horizon, then
> an object could not fall into a black hole in finite time and all such
> objects approaching the black hole would stay at the event horizon as seen
> by an outside observer.
> 
  The only flaw in your reasoning is that you don't destinguish between proper
  time and time as measured by observers far from the event horizon - i.e 
  coordinate time. It does take an infinite amount of coordinate time for an
  object to fall through the event horizon, but the falling object only takes
  a finite amount of proper time to do the same. The light coming from the 
  falling  object  is  also   infinitely  shifted  out  of  the  visible 
  spectrum so that the object effectively disappears. A particularly good
  discussion of this stuff can be found in "Gravitation" by Misner,Thorne
  and Wheeler in the chapter on black holes. As for the rest of your 
  queries, you would have to chuck out general Reletivity to get them to
  work!