Black Holes!

Discussion in 'Astronomy, Exobiology, & Cosmology' started by LeZtAtT, Mar 6, 2002.

  1. LeZtAtT Registered Member

    Messages:
    8
    I'm wondering how you could explore black holes ?

    How black holes become ?

    How could you know what black holes is ?



    Thanks..

    Best Regards


    /LeZtAtT
     
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  3. Adam §Þ@ç€ MØnk€¥ Registered Senior Member

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    Black holes are incredibly powerful gravity sources. There are many theories as to their nature, and evidence exists that very localised very intense gravity fields are wandering around out there, but still their nature is not known. For example, moving gravitational lenses have been spotted, and some attribute this to black holes. Whether they are actually dead stars is still a mystery; it's just a theory for which people have working equations so far.
     
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  5. LeZtAtT Registered Member

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    But, if there was so many teories, could someone share me some of them.
    cause I'm making a project about black holes, and i would gladly accept teories. . ..

    Thank you in advance



    Best Regards

    /LeZtAtT
     
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  7. wet1 Wanderer Registered Senior Member

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  8. Adam §Þ@ç€ MØnk€¥ Registered Senior Member

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    First, welcome to sciforums.

    http://cosmology.berkeley.edu/Education/BHfaq.html
    http://imagine.gsfc.nasa.gov/docs/ask_astro/black_holes.html
    http://www.netlabs.net/hp/tremor/bholes.html
    http://archive.ncsa.uiuc.edu/Cyberia/NumRel/BlackHoles.html
    http://antwrp.gsfc.nasa.gov/htmltest/rjn_bht.html
    http://physics.syr.edu/courses/PHY312.98Spring/projects/jebornak/
    http://csep10.phys.utk.edu/guidry/violence/blackholes.html


    All good links.

    I bought on DVD recently a documentary series called SPACE (imaginative name eh?) narrated by the actor Sam Neil. Quite a groovy series. In their discussion of black holes, they mention a team of astronomers who have been watching one small patch of sky full of very distant but closely packed stars for many many years. No results for ages, and then they saw on of those stars increase greatly in brightness. This they attributed to a black hole passing between Earth and that distant star. They can not say it was a dead star, only that it was a moving and very intense gravitational field.

    Oh, almost forgot the theory stuff. A very common theory is that black holes are the remnants of very massive stars. The idea is that when these stars run out of fuel, they lose energy, and the balance between their energy released and their massive gravity breaks. Unable to continue exploding (sort of), the gravity wins the struggle and they collapse. Maybe some of their matter shoots outward, but in some cases, it is thought, a great deal of the material just continues collapsing inward. The final explosion of the star going nova may add to the inward force, crushing all that matter inward even harder. Supposedly this leaves a very tiny chunk of dead star of incredible density. The gravity is very strong, and it sort of floats around the universe eating stuff.
     
    Last edited: Mar 6, 2002
  9. John Devers (AVATAR) Registered Senior Member

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    120
    We love our black holes on science forums

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    <A HREF="http://chandra.harvard.edu/photo/category/blackholes.html" target=new><FONT COLOR=blue size=+1> Chandra Black Holes
    </FONT></A>

    <A HREF="http://hubble.stsci.edu/news_.and._views/cat.cgi.black_holes" target=new><FONT COLOR=blue size=+1> Hubble Black holes
    </FONT></A>


    <A HREF="http://www.news.cornell.edu/releases/Jan00/Eikenberry.blackholes.deb.html" target=new><FONT COLOR=blue size=+1> black hole -microquasar GRS 1915+105
    </FONT></A>


    How about this one 40,000 light years away?


    <img src="http://www.news.cornell.edu/releases/Jan00/GRS1915.72.GIF">

    Or this one 10,000 light years away?

    <A HREF="http://www.gsu.edu/~wwwour/doublestarrel.htm" target=new><FONT COLOR=blue size=+1> Astronomers find survivor of supernova explosion in double-star pair
    </FONT></A>

    Here's one on the other side of our galaxy that doesn't add up.

    <A HREF="http://www.nature.com/nsu/011129/011129-13.html" target=new><FONT COLOR=blue size=+1> Massive hole makes theories leaky
    </FONT></A>

    Also did you know galaxy M33 does not have a Supermassive Black Hole in it but it's core contains a tiny one?
     
  10. LeZtAtT Registered Member

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    .....

    I thank everyone who helped me with infomation. . .

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    But, which evidence is there of black holes ?

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    Best Regards


    /LeZtAtT
     
  11. Jeffery Winkler Registered Member

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  12. Adam §Þ@ç€ MØnk€¥ Registered Senior Member

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    Groovy website, and welcome to here.
     
  13. Rick Valued Senior Member

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    Kmguru!Kmguru's avatar says an interesting piece of news that only recently (a couple of months back)broke up,that black holes were found to exhibit or pulsating out small amounts of energy radiations...




    bye!
     
  14. LeZtAtT Registered Member

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    ....

    Once and again I thank everyone who helped me with infomation.

    Which instrument do you use to find "black holes"(I mean how to detect them) ?


    Best Regards

    /LeZtAtT
     
  15. esp Registered Senior Member

    Messages:
    908
    LeZtAtT, Jeffery Winkler,
    Welcome ye both.

    Adam

    Yes. The space documentary you speak of was BBC in origin, I believe, and the way they tried to explain thing was excellent

    There is a theory that the forces holding individual galaxies together are super massive black holes.
    In every galaxy.
    Including this one.

    They suck and suck, causing their respective stellar matter to spin about them until they reach critical mass and consume the whole galaxy.

    Let's wait and see!

    BTW is LeZtAtT pronounced Lestat?
     
  16. LeZtAtT Registered Member

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    8
    Yes.

     
  17. LeZtAtT Registered Member

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    Is there any homepage ?
     
  18. TruthSeeker Fancy Virtual Reality Monkey Valued Senior Member

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    15,162
    LeZtAtT,

    Black Holes are baby Universes...

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    Actually, they are still in the womb of their mom...

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    ... It's part of my theory of Universe Evolution...

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    Love,
    Nelson
     
  19. Jeffery Winkler Registered Member

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    No one is interested in your crackpot "theory".
     
  20. thed IT Gopher Registered Senior Member

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    1,105
    Errr, no. Even a super-massive hole of 1E6 solar masses is dwarfed by its parent galaxy with around 1E9 solar mass.

    An idea, spiral galaxies are thought to be formed by 'spiral density waves' causing matter to concentrate and form stars. These 'waves' are meta-stable being able to last the life time of the spiral. See the lin-shu density wave theory for more details.

    The exact nature of these density waves is not explained in the theory. What if dark matter is somehow responsible?
     
  21. Rick Valued Senior Member

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    Is it possible that sun becomes a Blackhole?(our own Star of Solare system)

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    Because we have found out relatively that all the stars having Masses greater than Sun will become Black holes,all having Mass less than Sun will beccome White dwarfs,but what about Sun itself?

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    bye!
     
  22. TruthSeeker Fancy Virtual Reality Monkey Valued Senior Member

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    The Evolution of Stars

    zion,

    No.

    All stars greater than about 15 suns... I believe...

    Our sun will become a Red Giant. Then, It'll become a White Dwarf.

    Medium stars greater than some solar masses (I forgot all the numbers...) will become Neutron stars.

    Big stars with about 15 solar masses will become Black Holes.

    This happens because the limit of fuel in each occasion.
    In the case of our sun, we have basically Hidrogen burn with some Helium. Then, as it grows, it will shift it's fueling mostly to Helium. That's because the reactions inside the sun's core will become more active and the H will be transformed into He, by fusion. There are some formulae, but it's not necessary to explain it here...
    Then, the star finish by shrinking again because there is no more fuel to create fuson inside the star. Then, it becomes a White Dwarf.

    Medium stars have more fuel. So then, the core of the star shrink more, producing Oxigen and Nitrogen in it's core, what means more fuel. Then, it becomes bigger and bigger until it explodes in a supernova. In the case of a star with a "medium" size, it become a Neutron star.

    Bigger stars have enoght fuel to produce iron in their core. The star becomes bigger and bigger until it bursts into a supernova. In the case of a "big" star, the remanant mass is so great that the gravity starts to attract more and more mass to the core of the star. As it gathers more and more mass to the core of the star, it starts to warp space-time until not even light can escape. It became a Black Hole.


    The fate of the star is determined by its size. The fuel is burned in the core, and as the star develops, the fuson creates more and more elements. In the biggest case, a supernova throws into space lots of high elements like iron and, the biggest ones, even titanium!

    I learned this a loooong time ago... so I don't remember the numbers...

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    If I find the numbers and the chemical reactions I'll post them...

    In my theory, I talk about the evolution of Universes begining with what the stars finish: Black Holes.

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    Love,
    Nelson
     
  23. LeZtAtT Registered Member

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    ......

    I really need explaination about the machine, that is used for discovering black holes ?


    Best Regards¨



    /LeZtAtT
     

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