1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Question about Big Bang Theory

  1. Apr 9, 2010 #1
    Why do we think that the Big Bang contained "all" the matter/energy in the universe? If we imagine the point, the "big bang point" to be some accumulation of mass, what makes us think that it should have "waited" for all the mass in the universe to accumulate in it before exploding?

    That's just a thought that occurred to me.
     
  2. jcsd
  3. Apr 9, 2010 #2

    DaveC426913

    User Avatar
    Gold Member

    When we reverse the film that is the expansion of the universe, we are able to see that all the matter in the universe came from one very localized place in space and time. We have been able to reverse this film back to one billionth of a second before the BB, and there are no discrepancies worth noting.
     
  4. Apr 10, 2010 #3
    Why couldn't there be other such localized areas, billions upon billions of light years away from another bigbang. There could have been billions of bigbangs all over the universe. We just can't see far enough to gather the appropriate information, and we need to do more than just see as well. We have to go there, where ever there is. :P
     
  5. Apr 10, 2010 #4

    DaveC426913

    User Avatar
    Gold Member

    1] We base our theories on what we observe. No observation, no theory.

    2] A competing theory to what we have needs to explain everything our current theory does at least as well if not better. What does you supposition about matter elsewhere do?

    Why?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Question about Big Bang Theory
Loading...