# Black Hole Ideas

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1. May 17, 2014

### JimmySersland

(Correct me if you think i'm wrong in anyway, I am open to new ideas.) A black hole is created when a planetary mass has its atoms completely cave in on its self. This creates a massive amount of gravity, one so massive that it even attracts photons (light). So does this mean that a black hole isn't black but completely lacking any color at all? I think so. Here's something that I think is cool to think about (your thoughts requested no matter ;) how ridicules), If a black hole begun to suck a sun into is gradational pull
A. Would the pull of the sun pull the black hole any distance?
B. The sun being sucked in, collapsing the atoms(?), would increase the size of the hole(?)
C. What if we, our own solar system, is a black hole and our own physics are much different then the outside of our "realm".
D. Referring to C. Would that mean that the matter in a black hole could also be 99.99% free space?

2. May 17, 2014

### Bobbywhy

You specify a "planetary mass" forming a black hole. You may check the Wikipedia entry at

http://en.wikipedia.org/wiki/Black_hole

to find the common classification of black holes according to their mass.

“Black holes are commonly classified according to their mass, independent of angular momentum J or electric charge Q. The size of a black hole, as determined by the radius of the event horizon, or Schwarzschild radius, is roughly proportional to the mass..."

A. Gravitational attraction between two masses follows a simple relationship, always the same whether masses of black holes or any other kind of mass.

B. A black hole's size is measured by it's "event horizon". Adding mass increases it.

C. "What if we, our own solar system, is a black hole"? is a question that does not make any sense. Can you revise or rephrase it while keeping real black hole physics in mind?

D. Same as above.

Last edited: May 17, 2014
3. May 17, 2014

### Simon Bridge

Welcome to PF;
No - it takes much more than a planetary mass.

No - the gravity is exactly the same as when the matter was not collapsed.
It's just that the volume is very small, and gravity increases as you get closer to the surface.

The concept of color is tricky to apply to such objects. What you usually think of as the color of a surface is due to the light scattering from the surface interacting with your visual system. Since light does not escape the event horizon, then there is no color from there.

Advancing personal theories is frowned upon here. Do you have any references to back up your thinking?

Gravity is a long-range force.
When you say Sun" think "star".

The event horizon of the black hole would increase.

Then the "solar system" includes stars and galaxies and... well... the Rest Of The Universe. So it is the same as asking about "what if the physics outside the Universe is different".

1. Baseless speculation is frowned upon here.
3. The possibility that our Universe is inside a black hole has been explored.

That is a meaningless question.

I think you need to study more about black holes.
Starting from the quickie basics: