About what density of material, on average, is needed in order for the universe that we live in to be just barely bound, or "closed"?

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    about 75,000 atoms per cubic centimeter of space
     roughly 5000 atoms per cubic meter of space
     about 6 atoms per cubic meter of space.
     roughly 800 atoms per cubic kilometer of space
     The universe will expand forever, regardless of the amount of material contained within it.
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

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about 6 atoms per cubic meter of space.
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)

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