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you listen to podcasts. This is CBS I in the world I'm John Bachelor. Impact is the book. This is meteorites that fall to Earth and what we've learned about our solar system, about life, about water, about our understanding of where we come from.

Impact is the book, how rocks from space led to life, culture, and Donkey Kong.

Greg Brenica, a cosmo chemist is here.

And Greg, you teach me there are three kinds of meteorites that fall to Earth, our classifications. What are they? And you study one particular kind of meteorite I believe the CAIs what is that first the three kinds

thank you okay well a lot I guess I'll have to slightly correct you there's a a lot more than three kinds. I think there's three main kinds of contrites.

So I'll just kind of break it up into that.

There are contrites which are really primitive samples and then they're a conrites which have melted.

There are three types of conrites.

And one of those, you mentioned the CAIs or calcium aluminum-rich inclusions and you can see why we abbreviate it.

That's something that's contained in these carbonaceous chondrites

and they're kind of the earliest snapshots of our solar system so as it was just starting to form.

So the contrites are important because they are a journey back to the four billion years ago

when the cloud was gathering itself around what becomes the sun.

That's exactly right. They're very primitive samples. These chondrites are so important because

they've never been melted. They really represent a snapshot of that molecular cloud

and kind of as planets and planet testables were starting to form. The very, very beginning,

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