What is a flat universe ?

What is a flat universe ?
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1 Answer

Answer :

If the average density of the universe is equal to the concentration density ( Ω = 1) then gravitational attraction will be defeated for a short time by expansion. As a result, the expansion will not stop at all , only slowly it will continue to expand for eternity. In this case, everything is moving in the right direction. Space will be infinitely flat. Then it is called flat universe. The geometric shape of the plane universe will be plane.
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