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Black Holes

01/15/2012 11:01 AM

Why is there an accretion disk and not a sphere?

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#1

Re: black holes

01/15/2012 11:14 AM

"Due to conservation of angular momentum, gas falling into the gravitational well created by a massive object will typically form a disc-like structure around the object. Friction within the disc causes angular momentum to be transported outward, allowing matter to fall further inward, releasing potential energy and increasing the temperature of the gas."

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

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#2

Re: Black Holes

01/15/2012 2:30 PM

Rotation occurs on only one axis. (After all, even the earth is oblate.)

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#3

Re: Black Holes

01/15/2012 5:15 PM

You will notice this feature throughout the universe, whether it is Saturn's rings, a new solar system, or a spiral galaxy.

Once a system starts to rotate about an axis it tends to elongate into a rotating disk. Even the Earth is wider at the equator than the poles.

As matter starts to fall into a black hole it tends to fall in a parabolic trajectory and neighboring matter doing the same will tend to perturb each other as they do it and follow a similar path (statistically) about the black hole. Matter tends to fall into a decaying orbit until it crosses the event horizon where it disappears permanently.

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Guru

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#4

Re: Black Holes

01/16/2012 2:31 AM

Black holes might not exist - or at least not as scientists have imagined, cloaked by an impenetrable "event horizon". A controversial new calculation could abolish the horizon, and so solve a troubling paradox in physics.

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Guru

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#5
In reply to #4

Re: Black Holes

01/16/2012 4:52 AM

Oh yes, leave us hanging right there...much appreciated.

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#7
In reply to #5

Re: Black Holes

01/16/2012 5:53 AM
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#8
In reply to #5

Re: Black Holes

01/16/2012 8:36 AM

Worse, the text in his post is a direct copy of the text from another link (see post #7).

Okay, leave us a teaser, but if you quote someone you should put it in quotes and name the source. Doing otherwise implies that they are the poster's words and they clearly are not and violates copyright laws.

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#9
In reply to #8

Re: Black Holes

01/16/2012 9:49 AM

I did not think to be committing any violation. Links take extracts and presented in this forum. Take note for future. my apologies

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Guru

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#6

Re: Black Holes

01/16/2012 5:00 AM

Simulated view of a black hole (center) in front of the Large Magellanic Cloud. Note the gravitational lensing effect, which produces two enlarged but highly distorted views of the Cloud. Across the top, the Milky Way disk appears distorted into an arc.

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Associate

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#10
In reply to #6

Re: Black Holes

01/17/2012 6:59 PM

Problems with black holes:

  1. Invisible - identified by wideband radiation, etc
  2. Predicted/ invented by mathematician in 1796
  3. Opposed by Einstein in 1926
  4. Unprovable in laboratory
  5. Incapable of making galaxies without...dark energy/ matter - unprovable

What else could produce exactly the same effects?

  1. Radio, x-ray and UV (wideband em) are produced by accelerating electrons electrically or plasma discharge - lab experiment.
  2. What creates plasma? Electricity is easiest.
  3. What force is 10^37 greater than gravity - electricity
  4. Plasma also produces collimated jets, Birkeland currents, bubbles, sheets and dense fusion - accreting dust in z-pinches.
  5. Twisting pairs of Birkeland currents were shown in lab and simulation to generate spiral galactic entities.

Are we engineers or mathematicians?

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