Astrophysics Question

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  1. Marcos135's Avatar
    1 11-05-2012  15:21
    • Junior Member
    • Posts: 37
    Astrophysics Question
    Hi there,

    Can anyone help me with this astrophysics A-Level problem?

    What does a a open and a closed universe mean? I think the question is referring to the ultimate fate of the universe and what decides whether we are in a open or closed universe?
  2. teachercol's Avatar
    2 11-05-2012  16:25
    • Vengeful, Imperial Overlord of The Student Room
    • Location: Scarborough
    • Posts: 3,868
    Re: Astrophysics Question
    Open means expands forever
    Closed mean comes back to the big crunch.
  3. Marcos135's Avatar
    3 11-05-2012  19:12
    • Junior Member
    • Posts: 37
    Re: Astrophysics Question
    Thanks,

    ...and what decides what type of universe we live in...?
  4. Marcos135's Avatar
    4 12-05-2012  15:35
    • Junior Member
    • Posts: 37
    Re: Astrophysics Question
    (Original post by Marcos135)
    Thanks,

    ...and what decides what type of universe we live in...?
    No worries, I found the answer. It depends on the amount of matter and the critical density
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