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Homework Help: The density of the universe is

  1. Apr 27, 2012 #1
    The density of the universe is
    A) equal to the critical density if the universe is closed.
    B) equal to the critical density if the universe is flat.
    C) greater than the critical density if the universe is flat.
    D) greater than the critical density if the universe is open.
    E) none of the above
     
  2. jcsd
  3. Apr 27, 2012 #2

    phinds

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    Gold Member

    This sounds like a homework problem. Read the rules for posting homework problems.

    What do YOU think the answer is and why?
     
  4. Apr 27, 2012 #3

    HallsofIvy

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    Science Advisor

    What is the definition of "critical density"?
     
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