If the universe began from a singularity explosion why is it flat and not spherical?

or:If the universe began from a singularity explosion why is it flat and not spherical?or:Nobody knows a single fact on which to base any such statem

or:If the universe began from a singularity explosion why is it flat and not spherical?

or:Nobody knows a single fact on which to base any such statement. When they say \"flat\" they don't mean like a table.

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