Eli5 if time is relative and gets effected by gravity how could we possibly determine the age of our universe?
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It’s an approximation. But mostly we know about how much light redshifts as it travels. We can see radiation/light from the first seconds after the big bang at the very edge of our visible universe, and can calculate how long that light has been traveling based on varies standard candles of stars in the universe which we know how far they are away from multiple independent measurements.
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