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When most people believed in an essantially static and unchanging universe,the question of whether or not it had a begining was really one of metaphysics or theology.One could account for what was obseved wqually well on the theory that the universe had exists forever on the theory that it was set in motion at some finite time in such a manner as to look as through it had existed forever,But in 1929,Edwin Hubble made the land mark obsevation that wherever you look,distant glaxies are moving rapidly away form us.In other words,the universe is expanding .This means that at earlier times objects would have been closer together.In fact it seemed that there was a time ,about ten or twenty thousands million years ago.when they were all at exactly the same place and when ,therefore the density of the universe was infinite.This discovery finally brought the question of the begining of the universe in to the realm of science.