If it's flat then how a volume can be flat? And I've read that it's actually not flat .....it's a "Poincaré dodecahedral space". Any suggestions for books posts or articles are highly appreciated.
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“Flat” doesn’t mean flat like a piece of paper. It means “no spatial curvature”. There is no compelling evidence to support the Poincaré dodecahedral space idea. – G. Smith May 14 '19 at 04:48
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1“As of 2016, the publication of data analysis from the Planck spacecraft suggests that there is no observable non-trivial topology to the universe.” (https://en.wikipedia.org/wiki/Homology_sphere) What you read is out-of-date. – G. Smith May 14 '19 at 05:32