Black Hole: Seeing Inside & Out

[RAD4921]

It is pretty well known that you cannot see inside of a black hole from the "outside" universe. It is rather obvious as to why this is because gravity is so strong that everything including light gets sucked in but I just read that you cannot see the "outside" universe from inside of a black hole (assuming one wasn't crushed first). Why is this so? Thanks RAD

 

[Mental Gridlock]

I think it's because you can't see anything without a light source. Because you are now where it is completely dark, the only way you could see anything is if you turned on a spotlight or something but once you did turn that on all that light wouldn't go anywhere because it would be getting sucked in too.

 

[George Jones]

It is pretty well known that you cannot see inside of a black hole from the "outside" universe. It is rather obvious as to why this is because gravity is so strong that everything including light gets sucked in but I just read that you cannot see the "outside" universe from inside of a black hole (assuming one wasn't crushed first). Why is this so? Thanks RAD

It's not so.

See https://www.physicsforums.com/showpost.php?p=861282&postcount=5" of mine, and other posts in the thread.

Also, if the black hole is massive enough, you won't get torn apart by tidal forces before crossing the event horizon.

Regards,
George

 

[Phobos]

Well, at the singularity (point) nothing different exists to view...it's well, singular.

Inside the event horizon, but before hitting the singularity, I suppose time dilation would be so extreme that the outside universe unviewable.

 

[George Jones]

Inside the event horizon, but before hitting the singularity, I suppose time dilation would be so extreme that the outside universe unviewable.

No, at least not for the interior of an ideal Schwarzschild black hole. As I said in my post, images are seen - some blushifted some redshifted. Also, the scare quotes I put around 'at' mean in the limit as the singularity is approached.

The book Exploring Black Holes by Taylor and Wheeler gives a readable account of how to derive just what is seen.

Regards,
George