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

A few questions.

  1. Jan 19, 2008 #1
    Two questions to be precise, I've heard both ideas but neither from a reliable source. The ideas are put quite simply, and any further explanation would be much appreciated.

    Firstly: I've heard that if you continue to travel into space, you will eventually land up where you started, much like on this earth.

    Secondly: If you travelled far enough and fast enough into space, in theory could you eventually reach the light emitted fromt the big bang? So as light was released from the big bang in travelled into space, and is still travelling now.

    Both of these ideas sound like cool thoughts, but I'm not sure if they are correct. I know the second one is possibly irrelevant as we would never be able to catch the light up, but possibly an interesting concept.

    Thanks :smile:
  2. jcsd
  3. Jan 19, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    My non-physicist understanding is that we can see the radiation emitted within a short time period of the Big Bang. You don't need to travel to see it, it comes to you.
  4. Jan 19, 2008 #3
    That's awesome, I'm trying to find a source, where I can get some more information.
  5. Jan 20, 2008 #4
    Does nobody have an answer? Or possible explanation?
  6. Jan 20, 2008 #5


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Your first question has to do with the topology of the universe. At the moment the universe is thought to be very close to flat geometry and all observations indicate there is no non-trivial topology. If a non-trivial topology were to be discovered it would conflict with standard inflationary cosmology models.

    I think that your second question is assuming that somewhere in the universe there is a point where the big bang happened. This isn't really the case. Enuma Elish is referring to the CMB which is a snapshot of the universe as it was approx 400 000 years after the big bang.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook