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We assume the universe has been shaped by a explosion "Big Bang" but from what I understand explosions make the environment "not" homogeneous and "not" isotropic. If that's right how can we assume the universe is homogeneous and isotropic? or am I wrong about the meaning of homogeneous and isotropic?

Qmechanic
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Alireza
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    That's true if the "explosion" happens in one particular place in space , but since the Big Bang happened everywhere in space, this does not apply here. – pfnuesel Dec 20 '16 at 09:00
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    It's inflation that makes the universe homogeneous and isotropic. – SRS Dec 20 '16 at 09:29
  • This question, not exactly for the reasons you stated, though, is a current research topic. – G. Bergeron Dec 20 '16 at 11:37

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