Mike Raiford wrote:
> We can't prove there is something outside our own 
> universe because it's beyond what we can observe about our own universe.

There's a fair amount of sci-fi that does just this sort of thing. I 
wouldn't say it's logically impossible to prove there's something outside 
our own universe.

See, for example, Greg Egan's "Permutation City", or Robert Sawyer's 
"Calculating God".  And of course if something from outside simply modified 
the simulation to tell us of its existence...

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

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