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Flat Universe possess an edge?

  1. Dec 12, 2005 #1
    I have read from Universe by Freedman, Kaufmann that our universe is largly flat so it would mean there are edges in our universe. Our universe would be like a flat piece of paper that is continually expanding. A more realistic picture might be a diagram of Einstien's fabric of space time which is a flat sheet with spheres of planets sitting on it. But from the same source they stated that the universe does not possess an edge. I can see that a spherical universe would not possess an edge but how does a flat thing not have an edge?
     
  2. jcsd
  3. Dec 12, 2005 #2

    EL

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    If it's infinite!
     
  4. Dec 12, 2005 #3

    Labguy

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    Just do a PF search on "Flat Universe" and you will find that this has been discussed several times and flat does not mean flat like paper or a table top. Last posts explaining were within last 10-20 days, maybe even more recent.
    EDIT:
    Like THIS and
    THIS.
     
    Last edited: Dec 12, 2005
  5. Dec 14, 2005 #4

    Chronos

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    Agreed, Labguy. 'Flat' merely means the unverse has no 'edges' that can 'curl' back. It has nothing to do with whether or not the universe is temporally or spatially infinite.
     
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