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What shape does a three dimensional universe have ? and how did scientists determined that it is flat and not curved.

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  • $\begingroup$ Honestly, I haven't a clue what your question is about. Would you please care to clarify what you mean? Thanks. $\endgroup$
    – TildalWave
    Oct 16, 2013 at 16:53
  • $\begingroup$ @TildalWave I interpret it in terms of curvature - i.e. "How is the universe curved?" I think that would be a duplicate of something, though. $\endgroup$
    – HDE 226868
    Sep 30, 2014 at 1:33
  • $\begingroup$ @HDE226868 It would take about one minute off OP's time, and about 20+ minutes off each attempting to answer it whilst not being sure about its nature. I'd suggest that the former is the better option. ;) $\endgroup$
    – TildalWave
    Oct 1, 2014 at 14:34

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I think it's useful to realize the meaning of "shape" is not the same as in "what is the shape of this object I'm holding." Because we are a part of the universe, "shape" is about how things work (eg, how light moves through the universe), rather than "is the universe a sphere, cube, hypersphere or some other 'shape'."

This question is probably too broad to be answered here. I suggest reading the WikiPedia article on the 'Shape of the Universe'.

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