# Thread: How do we see inside the event horizon?

1. So, hey.
Let's have it this way.
You've got two guys floating right outside the event horizon.
And, one naughty imp pushes the other guy into the event horizon. :P

Getting biological, here.
A light ray's got to fall over an object and then reflect back into our eyes where our photo-receptors (Rods and cons) split the image into electrical impulses and all...
So, yeah.
So, if the person outside flashes the light into the event horizon, he won't be able to see anything. Because, it should hit the other guy and fall back into his eyes. But, no! That's not possible.
Because, the escape velocity of event horizon of a black hole is more than the speed of light.
So, it's not possible for us to see anything that's happening in a black hole.
Right?

2.

3. Yes.You're correct.But do you know how scientists recognised the presence of a black hole ?.Check this out..http://library.thinkquest.org/10148/long11.shtml

4. Yeah...
So, what does that say?
Mr.Hawking said that you'd see your friend slowing down in the event horizon.
How exactly do you see him? o.O
You can't see anything in the event horizon!
So, yeah.
You can't see anything in the event horizon. You can't see your friend slowing down. You can't see your friend speeding up.

5. Yes.

6. Originally Posted by Half Immune Wizard

Mr.Hawking said that you'd see your friend slowing down in the event horizon.
You can't see anything that happens beyond the event horizon, so I doubt very much that Prof Hawking ever said such a thing. Can you provide a reference ?

7. Originally Posted by Half Immune Wizard
So, if the person outside flashes the light into the event horizon, he won't be able to see anything. Because, it should hit the other guy and fall back into his eyes. But, no! That's not possible.
Correct. Inside Guy will see the light but no reflected light will ever make it back to Outside Guy.

Because, the escape velocity of event horizon of a black hole is more than the speed of light.
Actually, while that is true, that is a bit of an oversimplification. It is more accurate to say that nothing can escape because space is so curved that all paths lead to the center of the black hole.

So, it's not possible for us to see anything that's happening in a black hole.
Right?
Right.

8. Originally Posted by Half Immune Wizard
[FONT=Tahoma, Calibri, Verdana, Geneva, sans-serif][COLOR=#3e3e3e]Yeah...
So, what does that say?
Mr.Hawking said that you'd see your friend slowing down in the event horizon.
Slowing down as he (or she) approaches the event horizon.

9. Originally Posted by Strange
Originally Posted by Half Immune Wizard
[FONT=Tahoma, Calibri, Verdana, Geneva, sans-serif][COLOR=#3e3e3e]Yeah...
So, what does that say?
Mr.Hawking said that you'd see your friend slowing down in the event horizon.
Slowing down as he (or she) approaches the event horizon.
Yes! Sorry. Yeah, got that.

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