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If the age of the universe was calculated from measurements of the speed at which galaxies are moving away from us, and the universal expansion is accelerating, how do we know it isn't more than 13.8 billion years old?

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If the age of the universe was calculated from measurements of the speed at which galaxies are moving away from us, and the universal expansion is accelerating, how do we know it isn't more than 13.8 billion years old?	1