Suppose the Universe Contained Only "Normal" Matter, Like Hydrogen, Helium

question 116

Multiple Choice

Suppose the universe contained only "normal" matter, like hydrogen, helium, etc. How would the expansion rate of the universe change with time?

• A) It would speed up.
• B) It would slow down initially but then speed up when the matter pressure became high enough.
• C) It would slow down.
• D) It is impossible to tell, because it depends on the density of the matter.

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Definitions:

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