How come our universe still exists?

Discussion in 'Physics & Math' started by Railton2, Feb 24, 2011.

  1. Railton2 Registered Senior Member

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    I am not sure where to post this thread. Sorry if it is the wrong place. If it is, please move it to the correct forum, thanks in advance

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    Hey


    How come our universe still exists?

    According to what I know our universe was created from a singularity, the big bang, a so called explosion. If everything, including all matter and energy, was created at the time of the big bang, then all matter must have been squeezed together in the first nanoseconds of our universe. How come that there wasn't a black hole, when all the matter from our universe was squeezed into that small place in the first second?

    If there was a black hole, how come our universe still exists?


    According to what I know, the definition of a black hole is an object so dense, that the gravity is so powerful, that not even light can escape. That means in order for matter to escape from the event horizon created by a black hole, then the matter MUST exceed the speed of light. According to Einstein's theory of relativity; In order for matter to travel faster than the speed of light, then you must need more than an infinity amount of energy. Then how come that the matter escaped from the event horizon at the beginning?
    All matter in our universe MUST have travelled faster than the speed of light in order to escape it. Does that mean that all the matter in our universe had more than an infinity amount of energy in the beginning, in order to escape?

    Why didn't the universe collapse by its own gravity, without using an infinitive amount of energy for the matter to escape?
    If there wasn't an infinity amount of energy at that time, then our universe must have collapsed by its own gravity or what?


    How come our universe still exists?

    Did our universe collapse by it's own gravity?
    Could our universe be a black hole?




    Thanks for reading, I really hope you understand and will answer my questions

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    Sincerely,
    Mark


    Have a great day!
     
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  3. Dywyddyr Penguinaciously duckalicious. Valued Senior Member

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  5. Railton2 Registered Senior Member

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    Thanks.

    Have a great time

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  7. AlphaNumeric Fully ionized Registered Senior Member

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    This paper is an extremely good overview of such things by Susskind, whose well known for being good at explaining things. Figure 4 shows the sort of thing you are referring to, lots of universes appear and don't get very big but occasionally one manages it.

    Penrose also talks about it in his book 'A Road To Reality'. £10 (~$15) and so well worth buying.
     
  8. SciWriter Valued Senior Member

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    In general, this universe, or any, if there are more, exists now, which is any old non special time, in any old place, because it or they will always exist and ever did, because, again, obviously, it's here at any old time and place of eternity and infinity.
     
  9. Forceman May the force be with you Registered Senior Member

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    The universe is about a few hundred sextillion miles and is still expanding because dark matter hasn't caught up with the force of expansion, resulting in a far ahead future for the universe.
     
  10. SciWriter Valued Senior Member

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    Until it widely disperses and our descendants take to much lighter regimes…?


    We’re on a one way trip from the quantum fluke,
    That maximal energy within old Planck’s nook—
    Heading toward the oblivion of sparse expansion,
    All that we ever loved and knew going to extinction.

    We sent messages of early warnings to some,
    In those castles of illusion, yes, many a one,
    That they would face the decay, not so far away,
    Of the heavy particles, the “proton pause”, one day.

    No self-assembled granularity can endure
    Forever, but must return to the substructure,
    And, so, the lives must all transition, it seems,
    From heavier to much lighter regimes…

    Although this, too, would not be permanent,
    All destined to be swallowed by the firmament.
     

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