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A astronomy cast, episode 614, Centaurus, Comments and Asteroids.

Welcome to Astronomy Cast, our weekly fax-based journey through the cosmos, where we help you

understand not only what we know, but how we know what we know. I'm Fraser Cain, publisher of

University with me as always is Dr. Pamela Gay, a senior scientist for the Planetary Science

Institute and the Director of Cosmic Residence. Hey Pamela, how you doing? I am doing well. It is

fall here in the Midwest. The temperatures have dropped ever so slightly, but all the leaves are

starting to drop, which is beautiful and horrifying. So pretty. We're going to have to pick them up.

Someone can have to break them up. Yeah, yeah. I know that feeling. You're like, it's so pretty.

And then you know with horror that you're going to be raking up those leaves. And if you don't,

they choke out your grass. Yeah, I know. Feeling. We have beautiful fall leaves here as well.

They haven't quite arrived, but they're probably just a week away and it's all going to start

turning beautiful yellow. And yeah, I love it. It's a beautiful time of year. Although observing

is getting harder, which is where I'm just going to sit back and enjoy what has already been done

and is currently being presented by folks out at the Division of Planetary Sciences Conference.

And we rearranged our show order just a little bit much to the frustration of the folks who work

with us. And we're going to talk not about Planet Nine and potentially ten as planned,

but instead about all the active objects that new papers are coming out and talking about past

observations of. Okay. Whoa, whoa, whoa, spoiler alert. Let me do my intro before you completely

spoil the show. All right. All right. So there are asteroids and there are comets, but there's an

entirely separate class of objects called centaurs. But instead of half human half horse,

imagine an object that's half comet, half asteroid, but 100% interesting. All right, Pamela,

...