On Sunday, January 20, 2019 at 1:20:31 AM UTC-6, Gary Harnagel wrote:   
   > > [[Mod. note -- Note that your observation of A "halting" as it   
   > > approaches the event horizon of a black hole is in some sense an   
   > > optical illusion.  An observer colocated with A itself does not   
   > > observe this.   
   >   
   > I'm wondering if this is relevant to the distant observer.  What does   
   > A see looking back at said distant observer?  Does A see the observer's   
   > time passing more quickly than his?   
      
   A would see the "outside" universe speed up.  By the time A reached the   
   event horizon A would have witnessed the end of the universe, if there   
   is an end.   
      
   >   
   > Suppose A reverses direction just before he reaches the event horizon   
   > and meets up with the observer.  Won't A be younger and the observer   
   > be older?   
      
   Yes, just like the twin paradox in special relativity.   
      
   >   
   > OTOH, if A continues on and reaches the event horizon, he will pass   
   > on through in no time at all, but won't an infinite amount of time   
   > have passed for the observer?   
      
   Yes, except that by then the black hole will have evaporated by Hawking   
   radiation, per current understanding.   
      
   >   
   > Gary   
      
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