"One of the main open questions of modern astrophysics and cosmology is how and when galaxies formed and evolved starting from the primordial gas that filled the early Universe. In the most popular current theory, galaxies in the local Universe are the result of a relatively slow process where small and less massive galaxies merge to gradually build up bigger and more massive galaxies. In this scenario, dubbed 'hierarchical merging', the young Universe was populated by small galaxies with little mass, whereas the present Universe contains large, old and massive galaxies - the very last to form in the final stage of a slow assembling process."
Oh, you are so wrong . . .
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