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How does the observed total amount of matter in the universe, including dark matter, compare to the ...

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How does the observed total amount of matter in the universe, including dark matter, compare to the ...

How does the observed total amount of matter in the universe, including dark matter, compare to the amount of matter required to just close the universe?
A)   The observed total amount of matter equals the amount needed, to within observational uncertainty.
B)   The observed total amount of matter is about 1/3 of the amount needed.
C)   The observed total amount of matter is about twice the amount needed.
D)   The observed total amount of matter is about 1/200 of the amount needed.

Textbook

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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