# The Naked Scientists Forum

### Author Topic: I dont understand why ever one thinks black holes circular ?  (Read 2131 times)

#### mrMan

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##### I dont understand why ever one thinks black holes circular ?
« on: 21/02/2011 05:26:31 »
you could still spin around and be a different shape maybe you could slam the top of that circle it would a half circle with wave on it and a shore line

#### imatfaal

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##### I dont understand why ever one thinks black holes circular ?
« Reply #1 on: 21/02/2011 11:47:07 »
The sphere is the shape that minimizes gravitational potential - ie any other shape is more energetic and can/will decay to the sphere (things tend towards the lowest energy state).  Some models of black holes spin - so I guess that an oblate distortion would occur - but the maths of being sure on this is way beyond me.  I am not sure I can follow the second half of your question.

#### Bored chemist

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##### I dont understand why ever one thinks black holes circular ?
« Reply #2 on: 21/02/2011 19:37:36 »
Nobody has ever seen a black hole. It's widely hypothesised that they are point like. Does a point have a shape?
I think what the OP means is something like this.

but the "surface" of a black hole isn't real, there's nothing there to "splash"

#### CliffordK

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##### I dont understand why ever one thinks black holes circular ?
« Reply #3 on: 21/02/2011 21:51:16 »
That must be a space bubble, as I've never been able to make a bubble of water that stable.

I was thinking of the Solar System Heliosphere, based on the sun's movement through space.

However, apparently that model is now being revised.

See Wikipedia.
http://en.wikipedia.org/wiki/Heliosphere

Anyway, a sphere is a minimum energy.  In fact, planets and moons over a certain size all coalesce into spheres.

Of course, our Earth isn't a perfect sphere either...  it has a bulge in the middle.

The black hole is likely spinning, and not all forces around the black hole will be uniform.

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##### I dont understand why ever one thinks black holes circular ?
« Reply #3 on: 21/02/2011 21:51:16 »