At 05:56 PM 12/26/2012, Craig wrote:
Isn't it a calculated location? Isn't it the radius from the center
of the black hole at which a theoretical object at a great distance
would reach the speed of light when falling into the black hole from
its gravity?
No. Mass doesn't ever reach the speed of light. Light only travels at
the speed of light....
I'm puzzled here.
In fact, I'm seriously starting to smell a rat.
There is one somewhere around here, and I don't know if it's only in
my thinking, or in how event horizons and the like are being explained.
The event horizon is being described as the boundary around a black
hole where the gravity is so intense that light cannot travel away
from the hole at all.
Yet it's also being stated that the event horizon is generally
between the observer and the singularity, that if you cross the event
horizon, the singularity is still in front of you.
I'm having a bit of trouble wrapping my mind about both ideas at the same time.
It's also being said that a spaceship approaching the event horizon
from an observer's direction would appear to slow down, and redshift,
until it disappears. The slowing down, why? The ship is actually, as
it approaches the horizon, accelerating. Light leaving it, before it
reaches the horizon, will be redshifted, but that light will still
travel at the speed of light. Why would the ship appear to slow down?
