Opposing cosmological theories, the first credit goes to a Belgian astronomer_priest,Abbe Georges lemaitre. He explained this process of expansion, in what is known as THE EVOLOTIONARY THEORY or the big-bang theroy. He argued that billions of years ago, comic matter (Universe) was in an extremely compressed state, from which expansion started by a primordial explosion. This explosion broke up the superdence ball and cast its fragments far out onto space,
Where they are still travelling at thousands of miles per Second. It is from these speeding fragments of matter that our galaxies have been formed.
The formation of galaxies and stars has not halted the speed of expansion, the farthest pieces are flying the fastest. 
The primordil explosion is the hallmark of the big-bang throry. It also differs from other theories in two important respects. 
(1) it disagrees with the seady state claim, that new matter is being continuosly creatrd in the universe,
(2) it differs from the pulsating theory, in that,it does not admit, that matter will revert to the original congestion point, from which the primordial explosion started. 
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I love your choice of pictures for this. Especially the last one. I see faces in the last one - is that intentional? It is also so bright, so colorful. I could contemplate this image for a while. But it's almost too bright, it's a little hard to look at. I especially like the green and blue green on the edges. It looks like the edges are glowing.
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