How do we know the age of the Milky Way?

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Offline chris

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How do we know the age of the Milky Way?
« on: 26/06/2015 14:04:25 »
Various sources state that our Milky Way galaxy is about 13.2 billion years old.

But how do we know that?
I never forget a face, but in your case I'll make an exception - Groucho Marx

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Offline D

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Re: How do we know the age of the Milky Way?
« Reply #1 on: 12/07/2015 17:13:38 »
i think scientists can measure the expansion rate of the universe and from there they are able to analyze the age.