Black Holes .

Discussion in 'Free Thoughts' started by river, Aug 11, 2019.

  1. river

    Messages:
    12,607
    Upon what form of matter or energy is the essence of BH based on ?
     
  2. Guest Guest Advertisement



    to hide all adverts.
  3. davewhite04 Valued Senior Member

    Messages:
    3,535
    Dark matter if it exists. And maybe some rocks it's swallowing. I mean, assuming there are black holes.
     
  4. Guest Guest Advertisement



    to hide all adverts.
  5. river

    Messages:
    12,607
    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
  6. Guest Guest Advertisement



    to hide all adverts.
  7. davewhite04 Valued Senior Member

    Messages:
    3,535
    As far as we think we know, a BH has just one hole.
     
  8. river

    Messages:
    12,607

    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

    Messages:
    3,535
    Where did you read 2 outlets?
     
  10. river

    Messages:
    12,607

    None .

    Galactic Jets are numerous .
     
  11. DaveC426913 Valued Senior Member

    Messages:
    12,646
    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.
     
    TabbyStar and davewhite04 like this.
  12. davewhite04 Valued Senior Member

    Messages:
    3,535
    That makes sense.
     
  13. davewhite04 Valued Senior Member

    Messages:
    3,535
    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

    Messages:
    12,646
    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.

    Please Register or Log in to view the hidden image!




    First image of an actual black hole:

    Please Register or Log in to view the hidden image!

     
  15. river

    Messages:
    12,607
    You missed my point .
     
  16. davewhite04 Valued Senior Member

    Messages:
    3,535
    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

    Messages:
    12,646
    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

    Messages:
    12,646
    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

    Messages:
    3,535
    Your question has been answered, believe what you like.
     
  20. river

    Messages:
    12,607
    I wonder what we would see from all directions .

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

    Messages:
    12,646
    No need to wonder.

    Please Register or Log in to view the hidden image!

     
  22. river

    Messages:
    12,607
    Any from 180 degrees from us ?
     
  23. river

    Messages:
    12,607
    No energy flowing in .
     
    davewhite04 likes this.

Share This Page