IIUC, the difference is huge. In the former case, the universe is open, spatially infinite with infinite mass (assuming a nonzero mass distribution on large scale everywhere), whereas the latter is closed, finite in spatial extent and mass. But I notice that most cosmologists claim the universe is *flat*, as in mathematically flat. Are they just speaking loosely and really mean the universe is ASYMPTOTICALLY flat? I find it contradictory for a universe which is finite in age, to be truly mathematically FLAT. TIA.
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