How does the observed amount of visible matter in the universe compare with the amount required to make the geometry flat?
A) The observed amount of visible matter is about 1/3 of the amount needed.
B) The observed amount of visible matter equals the amount needed, to within observational uncertainty.
C) The observed amount of visible matter is about twice the amount needed.
D) The observed amount of visible matter is about 1/25 of the amount needed.
Correct Answer:
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