Use of Black Holes ???

On Jul 13, 7:06 am, Double-A wrote:

Nothing can enter a black hole. Time rate dilates infinitely at the
event horizon.

From our frame of referance 'out here' it appears to dilate. But from
the frame of referance 'there', the clock is still running at the
normal rate. Frame of referance is everything. :-) oc

On Jul 13, 11:20 am, oldcoot wrote:
On Jul 13, 7:06 am, Double-A wrote:

Nothing can enter a black hole. Time rate dilates infinitely at the
event horizon.

From our frame of referance 'out here' it appears to dilate. But from

the frame of referance 'there', the clock is still running at the
normal rate. Frame of referance is everything. :-) oc


Sure it is, but a funny thing happens on the way to the event
horizon: the universe meets its final fate! That is, unless infinite
means something other than what I think it does. But since Hawking
radiation is believed to leaving the black hole at a finite rate,
don't you suppose the black hole will have evaporated before the
infinite time has passed that it takes you to fall in?

Double-A

On Jul 13, 11:39 am, Double-A wrote:

..don't you suppose the black hole will have evaporated before the
infinite time has passed that it takes you to fall in?

Nope. Your on-board chronometer, your wris****ch as it were, is
running at the normal rate at all times. By time you reach the point
of falling in, it's *still* ticking at the normal (to your referance
frame) rate. And you'll fall right on in, experiencing acute
spagettification* in the process. But to our frame 'out here', your
infall will seem to be infinitely long.

*..unless it's a supermassive BH, in which case the 'spagettification'
effect is nowhere near as severe.
oc