Quote:
Originally Posted by speach
It's big very big. I feel that this is akin to 'counting how many angles can dance on the head of a pin'. The universe is expanding all the time, so it cannot have a finite dimension....
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Expansion pertains to the visible Universe which we know is a finite size due the particle horizon being finite.
Whether the entire universe (observable + unobservable) is finite depends on its curvature. A positive curvature indicates a closed finite universe.
By measuring the angular sizes of anisotropic structures in the power spectrum of the CMB obtained by the Planck probe indicates the universe has a zero curvature and is therefore flat and probably infinite in size.
Steven