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B If there is explosion with absence of oxygen?

  1. Jul 10, 2016 #1
    According to Dr. M. Kaku, how a big bang theory supports when there was an absence of oxygen in the outer space?
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  3. Jul 10, 2016 #2
    The big bang was not an explosion it was a fairly uniform expansion from a very hot dense state to a less hot and dense state but bigger in size.
    Also this expansion did not occur somewhere in space, the universe is space.
    Anyway not all actual explosions require oxygen, a nuclear bomb doesn't for one.
  4. Jul 10, 2016 #3
    You need oxigen for making fire, but not for an explosion. For example, explosions in main sequence stars are not related to oxigen but with fusion of hidrogen.
    But as said in the previous post, it is not an explosion of some kind of bomb but a rapid expansion of the space itself, so actually it has nothing to do
  5. Jul 10, 2016 #4


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    Also, be aware, Kaku is not a reliable source. He is a popularizer these days, not a scientist.

  6. Jul 11, 2016 #5


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    I think you should post a reference for this.
  7. Jul 11, 2016 #6


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    To be precise.... Kaku's popularizations do not meet the Physics Forums requirements for an acceptable source. His serious work is a different matter.
  8. Jul 11, 2016 #7


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    It would still be nice to have the context.
  9. Jul 11, 2016 #8


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    Yeah, and how can there be a "bang" if you can't hear sound in space?
  10. Jul 11, 2016 #9
    Anyway, the premise in the OP is faulty. Most "normal" explosions do not require external supply of oxygen.
    Not just nuclear explosions but gunpowder, dynamite, etc. So even if the analogy between big-bang and an explosion were relevant (I don't think it is), the absence of oxygen is not a problem.
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