I was listening to the audio book of "Death by Black Hole" by Neil deGrasse Tyson on my way into work yesterday and I came up with this question: Is the inside of a Black Hole not black? Here is my thought process behind the question and I would be interested in hearing if this was possible.
At the event horizon of a black hole, the gravitational forces exceed that of the speed of light so that light can not escape. However, I read that a black hole is an example of a Singularity with all of its mass located at one point in space. According to Newton's gravity equation, the gravitational forces created by a sphere can be calculated “as if” all of the sphere's mass is located at the center of the sphere. The Shell Theory states that if each layer of a sphere has a consistent distribution of mass, then as one travels in side the sphere the layers (Shells) further away from the center point from your distance can be ignored in calculating the gravitational forces created by the sphere at that point.
Example: If you assume a uniform density of mass for the Earth for discussion purposes, at ½ the radius of the Earth the gravitational forces are ½ that of at the surface of the Earth. This is because the distance has been cut in half, but the volume for a sphere at ½ the radius is 1/8 the total.
So, it is possible for a region in space to have enough matter to create a black hole effect with matter distributed throughout the region. But if the gravity were so high, wouldn't all the matter collapse into a singularity? One item to I would like to ask is wouldn’t the fact that time is also warped in a gravitational field that should be taken in consideration? It is my understanding that inside a gravitational field that is strong enough to prevent light from escaping would also warp time to slow down until it stops. If time nearly stops inside this large gravitational field, the movement of matter to the center point would also nearly stop or it would exceed the speed of light.
In this scenario, would it be possible for the gravitational forces inside a black hole region to be less inside the region than at the event horizon to the point that it is not greater than the speed of light? In this case, we could never see into the region, but light/space/time could exist.
Just a thought – I would be interested in reading any comments. Thanks!