That makes it a bit more complicated. I was referring to the exact radius at which light can not escape from a non spinning black hole as observed from far away. If a space ship reaches that radius from our perspective, it would totally blink out of existence. Theoretically, we are located far enough away from the black hole that its gravitational influence is approximately zero for us. I realize that the ship will undergo serious stretching as it approaches the hole, but this is a thought experiment and not real life. Does this help to narrow down the desired horizon?
Dave -----Original Message----- From: Jeff Berkowitz <[email protected]> To: vortex-l <[email protected]> Sent: Wed, Dec 26, 2012 4:57 pm Subject: Re: [Vo]:[OT]:Question About Event Horizon I read all the relevant wikipedia pages. My conclusion is that this question is very difficult and that the process of answering it will involve rephrasing it in more precise terms. In particular the term "event horizon" is a catchall for multiple distinct "horizons", each backed by a subtly different mathematical formalism. Jeff On Wed, Dec 26, 2012 at 9:20 AM, David Roberson <[email protected]> wrote: Is the event horizon of a black hole considered an observer relative location? We, who are at a very large distance relative to a black hole see the event horizon as located a finite distance from the center of the star. If another observer happens to be closer to the same hole, does he detect it as somewhat nearer to the center of the hole? I have an interesting thought experiment that depends upon the answer to this question. My suspicion is that the perceived horizon location does depend upon the exact location and most likely motion of the observer. Has anyone had an opportunity to actually calculate this effect? Dave
