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How do scientists determine the age of galaxies?

Answer 1

They don't have to.

Present theory has all the galaxies being formed at the same time at approximately 500 million years after the big bang. All galaxies are the same age.

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Answer 2

Ian Aitchison

Scientists determine the age of galaxies primarily through observations of their stars. They use techniques such as measuring the brightness and colors of stars to estimate their ages. Additionally, they analyze the distribution of different types of stars within a galaxy and study its overall structure and composition. By comparing these observations with theoretical models of galaxy formation and evolution, scientists can infer the age of a galaxy.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.