Warp wrote:
>   Has it even been hypothesized *why* the expansion of the universe
> happens? 

Dark Energy!  ;-)

Seriously, I think they think it has something to do with zero-point energy, 
i.e., the fact that virtual particles will spontaneously come into existence 
and then annihilate each other again.  I can't really say I understand it 
beyond "it's something about quantum" (as Terry Pratchett would say)

-- 
Darren New, San Diego CA, USA (PST)
   Serving Suggestion:
     "Don't serve this any more. It's awful."

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