Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The universe 700 trillion light years away.

  1. Jun 6, 2009 #1
    Our universe 700 trillion light years away.

    Could our universe 700 trillion light years away be alien to the observable universe? Containing objects that don't exist in the observable universe for example?
    Last edited: Jun 7, 2009
  2. jcsd
  3. Jun 6, 2009 #2
    i am sure that there are things in the observable universe that are still waiting to be discovered.
  4. Jun 6, 2009 #3


    User Avatar
    Science Advisor
    Homework Helper

    Errr... which universe 700 trillion light years away is this?
  5. Jun 6, 2009 #4


    User Avatar
    Science Advisor
    Gold Member
    Dearly Missed

    You know. The one that has those objects in it that don't exist in the observable universe.
  6. Jun 7, 2009 #5
    Oh,yes, that one almost forgot about that one! Why yes that one there where it has those objects in it that don't exist in the observable universe does contain objects in it that don't exist in the observable universe.

    I think what the OP was trying to say is:

    In our universe 700 trillion light years away could there be objects that are different from those that we can see.
  7. Jun 9, 2009 #6
    It's a big number yes, but it's possible the universe is that large. I recall reading in Lisa Randalls 'Warped Passages' yesterday that one model that she and a Greek physicist studied entertained the possibility that we are in a 3 (spatial) dimensional 'sink hole', and other non-causally connected parts of the universe might indeed by macroscopically higher dimensional.

    In answer to your question, YES. Anything outside the light horizon could be very different. However, without a warp drive or a wormhole we'd never know.
  8. Jun 9, 2009 #7


    User Avatar

    We are just trying to realize vastness of 156Gly, which is suppose to be our entire universe's recently measured diameter, i see somebody jumping high, talking about even 5000 times bigger universe. In that distance there might be a different universe, who knows. But i personally believe there is only one universe at the moment.
  9. Jun 9, 2009 #8
    Based on generally accepted cosmological models, it is very UNLIKELY there would be major distinctions in OUR universe just beyond our cosmological horizon. There is no widely accepted model that predicts such distinct variation in cosmological characteristics. In fact, as far as I know all models predict the SAME characteristics throughout our universe.

    In other words, the light we observe each succeeding day reveals a bit more of our own cosmos, since more distant light reaches us, and the cosmic background radiation appears to reflect rather uniform, consistent, expected characteristics. Nobody has said "WOW, LOOK AT THAT!! ALL OF A SUDDEN WE ARE GETTING AN ENTIRELY DIFFERENT KIND OF CBR"

    However, it IS possible there are causally disconnected multiverses, which might result from eternal inflation, for example, which are radically different from our own universe. In fact, if any such models are accurate it's virtually guaranteed something "alien" is out there because ALL possible variations would result...there would be literally an infinite number of all types of universes...the only ones which would not be present are those which quickly self destruct...

    As for a personal opinion, I don't think we have begun to scratch the surface of what's really "out there" but likely we have a pretty good initial view within out own universe. And we also have to keep in mind virtually all "consensus science" in history has been WRONG!!!! (from alchemy,to earth as the center of the uinverse, to how dogs learn, to vitamin C preventing colds, circular planetary orbits, to Einstein's "static" universe and recently, the very existence of dark energy and dark matter...we "just" found out we know almost nothing about 95% of the energy and matter in our own universe!)

    That last item makes me think maybe I should have said "not only do we not know beans about our own universe; we have no idea what we don't know"!!!!!
    Last edited: Jun 9, 2009
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook