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Originally Posted by Sam5
...This estimate changes about every 20-50 years, and it has been changing for the past 500 years. It has changed all during my lifetime...
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Cosmology concepts and theories have indeed changed, and seem to be changing more rapidly in recent times. The point is, there is no evidence that the universe was born just like a conventional spherical fireworks explosion, filling a pre-existing space. If it were, observation and physics would be different from what is observed.