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Testing the Theories - TestingtheTheories .Thestandard ,....

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Testing the Theories W hy the density of the universe  after t he big bang came very close to the critical density is called the “flatness problem.” The standard  big bang model offers no answer, other than “that’s just the way it was.” In the inflationary theory,  however, a brief burst of exponential expansion automatically flattens everything, driving the  density, no matter what its initial value, to almost exactly the critical density. This does not answer  why the other fundamental numbers are just right for the existence of life, but it does offer a  solution to the flatness problem. The inflationary theory can solve another problem, that of “horizon distance.” This is the  maximum distance that light can have traveled since the beginning of the big bang universe (this  has recently been narrowed down to about 13.7 billion light-years). The cosmic background 
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