Elsa Chang

That is NPR's Domenico Montanaro and Carrie Johnson.

Thank you to both of you.

You're welcome.

My pleasure.

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It was edited by Kelsey Snell, John Ketchum, and Patrick Jaron Watanonan.

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I'm Elsa Chang.

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Let's start with the Earth-sized planet around another star.

Gina, go.

This is so fascinating.

Wait, just remind me, what are like the ingredients that scientists look for when deciding whether there can be life on a planet?