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I How Black Holes Form?

  1. Jun 13, 2017 #1
    I didnt know much about black holes and also astrophysics but I want to know some general information about how they form.Well As massive star collapses the matter get so densed, then I guess internal pressure gets so high and as star explodes as supernova (maybe I described it wrong), ın any case what happens in these last moments of star ? Neutrons collapse on each other ?
     
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  3. Jun 13, 2017 #2

    Drakkith

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    Staff: Mentor

  4. Jun 13, 2017 #3
    While most of the energy released during gravitational collapse is emitted very quickly, an outside observer does not actually see the end of this process. Even though the collapse takes a finite amount of time from the reference frame of infalling matter, a distant observer would see the infalling material slow and halt just above the event horizon, due to gravitational time dilation. Light from the collapsing material takes longer and longer to reach the observer, with the light emitted just before the event horizon forms delayed an infinite amount of time. Thus the external observer never sees the formation of the event horizon; instead, the collapsing material seems to become dimmer and increasingly red-shifted, eventually fading away.[88]
    So we dont actually see a forming of a black hole and we never will, so Even ıf we look to sky searching for them we will see just a red-shifted dense light ,I didnt quite understand this part.

    In my part it says that there could be , It says "even the degeneracy pressure of neutrons is insufficient to stop the collapse. " but what happens after that is a mystery I guess, I mean ıs there any equations or physical description that describes the situation.It collapses but what happens to neutrons or quarks in that process do we know that ?
     
  5. Jun 13, 2017 #4

    Drakkith

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    None that can be verified.

    We don't know. Perhaps the collapse is halted at some point by degeneracy pressure of another phase of matter or perhaps the matter is infinitely compressed into a singularity. We just don't know.
     
  6. Jun 13, 2017 #5
    I understand, thanks
     
  7. Jun 13, 2017 #6
    Anything can become a black hole theoretically! If you was to take the mass of Mount Everest and compress that same mass into the size of a pin head that mass will become a singularity.
     
  8. Jun 13, 2017 #7
    Yeah I know, but for me the process is important, how?
     
  9. Jun 13, 2017 #8
    Singularitys are one-dimensionalpoint which contains a huge mass in an infinitely small space, where density andgravity become infinite and space-time curves infinitely, and where the laws of physics as we know them cease to operate. As the eminent American physicist Kip Thorne describes it, it is "the point where all laws of physics break down". Overall we arnt sure how they form it's all theory, sorry buddy wish I could be more help
     
  10. Jun 13, 2017 #9

    Drakkith

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    Points are of zero dimensions. An object of 1 dimension is a line. :wink:
     
  11. Jun 13, 2017 #10
    No, other than string theories which cannot be tested, we have no clue at the moment.
     
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