I agree with the idea that a big bang was a singularity of matter, which burst into all matter that we know, and that the universe is expanding-galaxies are drifting apart. What is the common understanding of what was before this singularity. I can only deduce that it was another universe, with the "expanding and then contracting onto itself" idea of universe formation. So therefore, the universe is infinite because it will constantly be re developed. But how does one have infinity, i understand you cannot see the end because it has not happened yet but how could you have an undefined beginning :uhh:. there is a center to the solar system, and our galaxy, is there a center of the universe? Is the universe infinite and why does a galaxy appear to look two dimensional whereas a cluster of them is 3d.