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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


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


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    Last edited by a moderator: Apr 21, 2017
  5. Dec 14, 2005 #4


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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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