[frodo.rok]

If you believe in the big bang theory that inadvertently puts a limit to the size of the universe. Considering that the universe started expanding from one point and with the assertion that maximum speed attainable is that of light, if we know when the big bang occurred we can put an upper limit to the radius of the universe (d = s*t). We can find out when the big bang happened by studying the relative motion of galaxies and extrapolating it backwards to the center of the universe. I've heard of such figures as Universe being around 14 billion years old and the diameter of it being around 150 billion light years.--Vissin

extrapolating it backwards to the center of the universe--Vissin


Xeahavlynx I am sorry if I have made you confuse but as per as my knowledge Big Bang is a theory yet to be proved.So I can help it if THERE LIES CONFUSSIONS.
Now on extrapolating backward You will not find the same laws working if you have any faith on GENERAL THEORY OF RELATIVITY.
Suppose the universe is now at a state where it has a radius of say 5 km and it is expanding.
Just imagine everything lies in that sphere with radius of 5 km.
What will happen at this moment??
General theory of relativity tells us due to almost infinitely high gravitational force space and time will be so curved that every laws of physics get broken down.
d = s*t....This simple formula will not work at that moment.
Also if you say singularity is a hypothesis then i am afraid theory of Big Bang is no exception.
THE EXPANSSION OF UNIVERSE IS JUST LIKE A BALLON WITH DOTS IN IT.
When you start blowing it the the distance between the dots increases.
Just in case of our universe distance between Galaxis is increasing.
But in comparission to the Gallactic distance the radius of Universe will always appear to be INFINITE.