Chapter 1: What is the main topic discussed in this episode?
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Hey, Joyvers. Regina Barber here. It's time for my favorite monthly episode, our space news segment, Spacing Out with Gina. We're here today with science correspondent, Katie Riddle. Hey, Katie. Hey, Gina. I will say you're going to have to learn a secret handshake by the end of the day. I'm ready.
I'm ready for it.
And space connoisseur and all things considered host, Scott Detrow. Welcome back, Scott.
I like space connoisseur. I'm excited to be here. I'm excited to hear what you will teach us this week.
Yes, I actually did used to teach this stuff for like a dozen years. But Katia, you're actually going to start us off, though, with a story about the furthest planet in our solar system.
Exactly. Which, you know, I grew up learning was Pluto. But unfortunately, it's since been kicked out of the major planet guild. There's a lot of beef, a lot of baggage. I'll be telling you about Neptune today and how one of its moons could help us fill in the gaps of our solar system's origin story. But I promise it'll still be fun.
Can I rattle off the slightly dated mnemonic device? That is a hard word to say that I learned to say all the planets.
Do it.
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Chapter 2: What recent discoveries have been made about Neptune's moon?
Well, now we know.
There's been questions about one specifically called Nereid for decades. Researchers have been wondering whether this moon was formed right in Neptune's orbit or if it's an interloper from elsewhere.
What makes them think that could be the case?
Well, for starters, Nereid has a really unusual orbit. It's stretched into this elongated oval shape. For years, that highly eccentric orbit led researchers to speculate that it was not formed around Neptune. Moons that are born, so to speak, around a planet tend to travel in a kind of regular circular path.
But now we're able to look more closely at Nereid's composition and see evidence that despite this weird orbit, it is more consistent with a moon that formed around Neptune than one that was captured from elsewhere.
What is going on with this smooshed orbit shape, though?
Yeah. The idea now is that it was shoved into this unusual orbit by another moon called Triton at an earlier point. Triton is big. It's about eight times bigger than Nereid. And it turned out it's kind of a bully.
I actually kind of like Triton. But OK. But when you have 16 moons, things are going to be very competitive.
Yeah, exactly. Our moon is lucky. It doesn't have to compete for real estate around Earth. I talked to Matthew Belyakov from the California Institute of Technology. He's the lead researcher on a new paper out about this in the journal Science Advances.
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Chapter 3: How does Nereid's unusual orbit challenge our understanding of moons?
This episode was produced by Arun Nair and Kai McNamee. It was edited by Christopher Intagliata, Amina Khan, and our showrunner, Rebecca Ramirez. Kadia, myself, and Tyler Jones checked the facts. Jimmy Keeley and Ted Meanbane were the audio engineers. I'm Regina Barber. Thank you for listening to Shortwave, the science podcast from NPR. See you Monday.