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Re: Cosmology



At 6:12 PM -0700 2/11/01, Jim Green, you wrote about Re: Cosmology:


>There is no evidence that our galaxy is expanding. The universe is
>expanding according to evidence of a couple of kinds, but none of
>that evidence arises from observation of objects within our galaxy.
>No external galaxy is seen to be expanding, either.

What makes a local cluster "gravitationally bound" and not a super cluster?


Sounds like there is a certain mass density that cancels the expansion.

Is there an accepted value for this density?

Is it determined empirically?

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