It is my understanding that for something to be scientific fact it has to be repeatable and observable.
How is the age of a star able to be proved scientifically?
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Physicist made models of how stars works. With time elements content in a atar differs and so sight spectrum ot sensnds out. knowing light spectrum of elements and star life cycle we can estimate it age. For distant stars there’s other methods that are based on our distance to a star
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