Black Holes .

Discussion in 'Astronomy, Exobiology, & Cosmology' started by river, Aug 11, 2019.

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  1. river

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    Upon what form of matter or energy is the essence of BH based on ?
     
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  3. davewhite04 Valued Senior Member

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    Dark matter if it exists. And maybe some rocks it's swallowing. I mean, assuming there are black holes.
     
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  5. river

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    Think galactic jets .

    Which emanate from both poles .

    So why would a BH do so ?

    A singularity is one directional .
     
    Last edited: Aug 11, 2019
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  7. davewhite04 Valued Senior Member

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    As far as we think we know, a BH has just one hole.
     
  8. river

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    Yet BH has apparently two outlets of energy . Both opposite of each other . Why?

    How can a singularity have two outlets of Galactic jets energy ?
     
  9. davewhite04 Valued Senior Member

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    Where did you read 2 outlets?
     
  10. river

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    None .

    Galactic Jets are numerous .
     
  11. DaveC426913 Valued Senior Member

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    A black hole is not made of energy.
    It is a concentration of (normal) mass so high that even atoms are crushed down to (what we presume to be) an infinitesimally small volume.


    Dark matter is not related to black holes.

    Black holes are formed from collapsing stars. Stars are held stable by the balance between the radiative (outward) pressure from fusion and the (inward) pressure of gravity. When the star runs out of fuel, the radiative pressure is gone, and the gravity takes over. There is ontihng to stop it.

    The jets do not come from the black hole itself. They are a product of the infalling matter - still outside the event horizon - that is squeezed by gravity and huge magnetic flux. Vast vortices of magnetic flux compress the ionized matter, but the matter manages to escape along the axes - the poles - of the magnetic field - jetting out in opposite directions at nearly the speed of light.
     
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  12. davewhite04 Valued Senior Member

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    That makes sense.
     
  13. davewhite04 Valued Senior Member

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    Good point, but no light but still something seeable with a terlescope is the effect of the subatomic particles coming out, they give off a light.
     
  14. DaveC426913 Valued Senior Member

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    No.

    A black hole is black.
    What we see is the accretion disk - light radiating from the extremely hot compressed gas and dust spiraling around and into the BH.

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    First image of an actual black hole:

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  15. river

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    You missed my point .
     
  16. davewhite04 Valued Senior Member

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    Yeah, but you can easily see a light effect from the subatomic particles escaping, What's in black hole is not important.
     
  17. DaveC426913 Valued Senior Member

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    It is true that - within the event horizon - light can only fall inward, never outward.

    But a black hole is almost always surrounded by infalling matter, and this is very bright - especially in X-rays.
     
  18. DaveC426913 Valued Senior Member

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    I don't know what subatomic particles you refer to.
    The light comes from normal matter in the BH's accretion disc.
     
  19. davewhite04 Valued Senior Member

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    Your question has been answered, believe what you like.
     
  20. river

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    I wonder what we would see from all directions .

    For starters from a perspective 180° from ours .
     
  21. DaveC426913 Valued Senior Member

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    No need to wonder.

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  22. river

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    Any from 180 degrees from us ?
     
  23. river

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    No energy flowing in .
     
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