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Thread: If The "big Bang" Theory Is Correct...

  1. #1
    UKMan's Avatar Poster
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    If you believe in the Big Bang theory, then explain what came before that - and in that case, what came before that. If you dont, then what is your opinion or belief?

    My own personal opinion is that the answer is so simple, it defies logic:
    Space has allways been there and there was nothing before that because it has allways existed!

    I also believe that (if there is a God/Creator/Thing/Entity/Whatever - whatever your definition is) - he is only OUR God/etc/etc and that other Gods/etc/etc exist in other universies or/and Galaxies.

    Please keep this on a nice level with good deap discussions and no trashing please. Everyone has a right to their own opinion without being flamed - including lil'ol'me

    Peace
    UKSpaceMan

  2. Lounge   -   #2
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    I think that humans automatically assume that there has to be limits to things, to make them fit into their imaginations - infinity is somewhat difficult to picture.

    I think that's where things like the Big Bang theory and Creationism come from - an attempt to justify a universe in terms that humans can be comfortable with.

    Personally, I'm quite happy with the idea that space is unlimited, always has been and always will be. Others don't find this so easy to accept.

  3. Lounge   -   #3
    4play's Avatar knob jockey
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    my theory is that there was always a universe likes your theory ukman but this is not the first big bang. when the universe expands due to the explosion it is then sucked back together slowly by gravity.

  4. Lounge   -   #4
    Gemby!'s Avatar Poster
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    i think mummy and daddy called up my stork and said "Hey we want a perfect daughter!" and then mr stork said " why certainly!"

    thats how it all began
    Single handedly destroying the NHS from the inside

  5. Lounge   -   #5
    MediaSlayer's Avatar slowly going deaf
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    this is slightly different than the big bang, but its relevant:
    one night i was partying with some germans and we were sitting around talking, having a good time. then this subject came up, as it always does. I asked this guy how we came to be in this present state and he said we evolved, like darwin said. He said we came from monkeys, and before monkeys existed there were smaller life forms. Before the smaller life forms, there was no earth, just space. Basically he said everything just came to be. The universe just "happened". When I asked what happens when you die, he said we just "go into the dirt". In other words, nothing happens, your existance is over.


    sending fiery missiles in manker's japan's general direction.

  6. Lounge   -   #6
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    Originally posted by MediaSlayer@10 November 2003 - 19:52
    When I asked what happens when you die, he said we just "go into the dirt". In other words, nothing happens, your existance is over.
    Yeah. Most humans really don't like coming to terms with that one.

  7. Lounge   -   #7
    MediaSlayer's Avatar slowly going deaf
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    yeah, death is a part of life


    sending fiery missiles in manker's japan's general direction.

  8. Lounge   -   #8
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    It seems fairly likely that there was a Big Bang. The obvious question that could be asked to challenge or define the boundaries between physics and metaphysics is: what came before the Big Bang?
    Physicists define the boundaries of physics by trying to describe them theoretically and then testing that description against observation. Our observed expanding Universe is very well described by flat space, with critical density supplied mainly by dark matter and a cosmological constant, that should expand forever.
    If we follow this model backwards in time to when the Universe was very hot and dense, and dominated by radiation, then we have to understand the particle physics that happens at such high densities of energy. The experimental understanding of particle physics starts to poop out after the energy scale of electroweak unification, and theoretical physicists have to reach for models of particle physics beyond the Standard Model, to Grand Unified Theories, supersymmetry, string theory and quantum cosmology.
    This exploration is guided by three outstanding problems with the Big Bang cosmological model:
    1. The flatness problem
    2. The horizon problem
    3. The magnetic monopole problem

    Flatness problem

    The Universe as observed today seems to enough energy density in the form of matter and cosmological constant to provide critical density and hence zero spatial curvature. The Einstein equation predicts that any deviation from flatness in an expanding Universe filled with matter or radiation only gets bigger as the Universe expands. So any tiny deviation from flatness at a much earlier time would have grown very large by now. If the deviation from flatness is very small now, it must have been immeasurably small at the start of the part of Big Bang we understand.
    So why did the Big Bang start off with the deviations from flat spatial geometry being immeasurably small? This is called the flatness problem of Big Bang cosmology.
    Whatever physics preceded the Big Bang left the Universe in this state. So the physics description of whatever happened before the Big Bang has to address the flatness problem.

    Horizon problem

    The cosmic microwave background is the cooled remains of the radiation density from the radiation-dominated phase of the Big Bang. Observations of the cosmic microwave background show that it is amazingly smooth in all directions, in other words, it is highly isotropic thermal radiation. The temperature of this thermal radiation is 2.73° Kelvin. The variations observed in this temperature across the night sky are very tiny.
    Radiation can only be so uniform if the photons have been mixed around a lot, or thermalized, through particle collisions. However, this presents a problem for the Big Bang model. Particle collisions cannot move information faster than the speed of light. But in the expanding Universe that we appear to live in, photons moving at the speed of light cannot get from one side of the Universe to the other in time to account for this observed isotropy in the thermal radiation. The horizon size represents the distance a photon can travel as the Universe expands.
    The horizon size of our Universe today is too small for the isotropy in the cosmic microwave background to have evolved naturally by thermalization. So that's the horizon problem.

    Magnetic monopole problem

    Normally, as we observe on Earth, magnets only come with two poles, North and South. If one cuts a magnet in half, the result will not be one magnet with only a North pole and one magnet with only a South pole. The result will be two magnets, each of which has its own North and South poles. A magnet cut in half still has two poles
    A magnetic monopole would be a magnet with only one pole. But magnetic monopoles have never been seen? Why not?
    This is different from electric charge, where we can separate an arrangement of positive and negative electric charges so that only positive charge is in one collection and only negative charge is in another.
    Particle theories like Grand Unified Theories and superstring theory predict magnetic monopoles should exist, and relativity tells us that the Big Bang should have produced a lot of them, enough to make one hundred billion times the observed energy density of our Universe.
    But so far, physicists have been unable to find even one.
    So that's a third motivation to go beyond the Big Bang model to look for an explanation of what could have happened when the Universe was very hot and very small.


    Superstring theory.



  9. Lounge   -   #9
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    like i always say, all science is, is a load of made up crap that noone can actually prove

  10. Lounge   -   #10
    Mr. Mulder's Avatar pepper your angus BT Rep: +10BT Rep +10
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    I also think that space has always been here …was watching this fascinating program last night on "String - theory" and how there might be another dimension that balances out the universe and keeps it stable

    ...wouldn't the question then be "Have they always co-existed or did one come before the other?

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