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Questions that have been freaking me....

  • 25-04-2004 10:59am
    #1
    mike65
    Closed Accounts Posts: 88,972 ✭✭✭✭


    ...as we look out into space we look back through time but as time is linear and space is 3-dimensional how can we look "back" in all directions? Also as defintion and power increase will we one day be able to see the big bang? or at least its immideate aftermath? and in which direction?

    My brain hurts, I need to lie down...:ninja:

    Mike.


Comments

  • #2
    Sev
    Registered Users, Registered Users 2 Posts: 1,328 ✭✭✭Sev


    Originally posted by mike65
    ...as we look out into space we look back through time but as time is linear and space is 3-dimensional how can we look "back" in all directions?

    Well theres your problem, the universe isnt 3 dimensional, its 4 dimensional. Space is supposed to be curved, folded in on itself. Imagine a race of 2 dimensional beings that lived on the earth, and they only could understand two dimensions, the earth to them at any point was just a flat map, and they could go left right up down, however, one day, some 2 dimensional pioneer, travels off left, and keeps going in one straight line, finds himself back where he started, he cannot grasp this at all, because he fails to understand the 3rd dimension, and cant grasp how the earth is 'round'.

    You're in a similar situation.


  • #3
    dgarrad
    Closed Accounts Posts: 45 ✭dgarrad


    About being able to see back as far as the big bang, unfortunately that's physically impossible. During the early stage of the universe, there was no real meutral matter. Space was filled with charged matter, which scattered any light travelling through the universe. At a certain point, matter cooled down to become neutral, and at this point photons stopped interacting with matter. We will only be ever to see back as far as this point in time, as any light before that was scattered randomly.


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