# Thread: Question re: black holes for DA and other knowledgeable people

1. Black holes are intangible, correct?

2. Originally Posted by Le Type Français
Black holes are intangible, correct?
*shrug*

3. Originally Posted by Steven Edwards
I don't think we have a clear enough picture of singularities to say.
That's why I phrased it as a question. ;-)

Originally Posted by Steven Edwards
But, not all black holes contain singularities.
I interpreted that article as saying that all black holes *do* contain singularities, but the shape that the singularity takes is different in non-rotating black holes (where it's a point) and rotating black holes (where it's "smeared out to form a ring shape").

Here's some concepts from that Wiki piece on singularities that make my brain want to explode:

Singularities of whatever shape have zero volume but contain all of the mass of the black hole.

It's impossible to avoid a single-point singularity, and any attempt to do so will only get you to it faster than if you didn't try to avoid it. (Cosmic quicksand?)

Great thread that I'm enjoying very much even as it makes me feel completely stupid!

4. Originally Posted by Steven Edwards
Tom's link to the Hubble site said black holes follow the laws of gravity.
I think the mass which surrounds the black holes are following the laws of gravity.

5. Originally Posted by thehipcrip
I interpreted that article as saying that all black holes *do* contain singularities, but the shape that the singularity takes is different in non-rotating black holes (where it's a point) and rotating black holes (where it's "smeared out to form a ring shape").
My interpretation: a point is one-dimensional, a ring shape necessitates multiple dimensions. (Plus, the last sentence: "It is generally expected that a theory of quantum gravity will feature black holes without singularities.")

Great thread that I'm enjoying very much even as it makes me feel completely stupid!
It's showing me that taking some OCW courses could be fun.

I think the mass which surrounds the black holes are following the laws of gravity.
Possibly so. I'm not qualified to say.

6. Originally Posted by Steven Edwards
Possibly so. I'm not qualified to say.
Yeah, actually, I know too little about black holes to be making any type of guess as to what they are or how they function. I just wanted in on a fun conversation.

7. Black holes are silly. Always noming away at whatever comes near them.

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