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Astronomy Cast Episode 247 from Monday, January 9, 2012. The Age of Things.

Welcome to Astronomy Cast, our weekly facts based journey through the cosmos, where we help you understand not only what we know, but how we know what we know.

My name is Fraser Cain, I'm the publisher of University Day, and with me is Dr. Pamela Gaye, professor at Southern Illinois University, Evertsville.

Hey Pam, how are you doing?

I'm doing well, how are you doing, Fraser?

Good, and where are you this week?

I am in Austin, Texas, at the 219th meeting of the American Astronomical Society.

That's good, so you were buried in space news.

I am not only buried in space news, but I'm among my people, it's a good place to be.

People, right, with your flock, that's good.

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Alright, so this is going to be one of those how we know what we know kind of shows.

How do scientists determine the ages of things?

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