How Does the Observed Total Amount of Matter in the Universe

question 29

Multiple Choice

How does the observed total amount of matter in the universe, including dark matter, compare with the amount of matter required to make its geometry flat?

• 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 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 1/25 of the amount needed.