In a message dated 1/11/98 5:52:36 PM, phoenix@ugcs.caltech.edu wrote:
>On Jan 11, 9:57am, Hal Finney wrote:
>
>> Unless there are some ad hoc topology wraparounds, the zero and negative
>> curvature universes are infinite in spatial extent, with an infinite
>> number of stars, unlike the closed universe.
>
>Say what? I have heard no cosmologist besides Eric Lerner suggest the
>universe is infinite in extent and mass. Finite and expanding is the
>canon, no?
The 4D spacetime of a open universe has to be infinite, but 3D "spatial"
slices don't. All the theories I've seen posit a universe finite at
any specific time, and the the time dimension provides the infinity.
Received on Mon Jan 12 01:13:23 1998
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