Quote:
Originally Posted by Sock puppet
I assume you mean "mainstream theories of cosmology"?
If that is the case, the answer is: One. Big Bang cosmology.
While there are plenty of other theories of cosmology, none of them explain the observational evidence nearly so well as the big bang.
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Thank you, Sock puppet, where would you say 'string theory' comes in ? Is there a relation with a cosmology theory ?