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Josh Clark
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Chuck Bryant
Card has no cash access and expires in six months. Welcome to Stuff youf Should Know, a production of iHeartRadio.
Josh Clark
Hey, and welcome to this podcast. I'm Josh and there's Chuck, and Jerry's here, too. Did I flub that line? Yes. Am I going to retake it? No, I am not.
Chuck Bryant
Welcome to the POD broadcast.
Josh Clark
This is stuff you should know, by the way. The Far Out Edition.
Chuck Bryant
That's right. As in stuff out there in space.
Josh Clark
Yeah, and not just stuff in general. We're actually going to zero in on one specific piece of stuff that's out there in space. A little planet called Saturn.
Chuck Bryant
That's right. The ringed beauty, as they like to say in the biz.
Josh Clark
That's what the astrophysicists all call it. Yeah, well, or Saturn does have rings. It's not the only planet with rings, as we'll see. Or we can see now. I think Jupiter and Uranus. And is it Mercury also that has rings? But they're just. They don't hold a candle to Saturn's rings.
Chuck Bryant
Hey, get the candle away from my anus.
Josh Clark
Saturn's also a really ancient planet in that as far as human experience goes, for as long as we've been looking up in the night sky, we've seen Saturn because it is the sixth planet from the sun. It's also the furthest planet away that you can see with the naked eye here on planet Earth.
Chuck Bryant
You want to know something funny before we go any further?
Josh Clark
Yeah.
Chuck Bryant
Always before we recorded, Emily was asking, as she sometimes does, what we're recording, and I told her the two episodes. And she asked about Saturn. And I was like, not very interesting to me. She said, so what do you do in those episodes? Just, like, do commentary and make jokes. I went, well, there's probably not going to be a lot of jokes. And she said, well, as long as you can make one about Uranus. And I said, I don't think I'll be able to because it's about Saturn and lo and behold, a minute and 20 in.
Josh Clark
Yeah.
Chuck Bryant
Wow.
Josh Clark
Now you have two more times to bring it back, and then you'll have completed the comedy trifle.
Chuck Bryant
I think that's a oner, as they say. But I'm just excited to report back to Emily that that happened unexpectedly and delightedly.
Josh Clark
Well, way to go, Chuck. I thought you said it was going to be funny, though, huh?
Chuck Bryant
Hey, you laughed. Was that pity?
Josh Clark
Let's just move on.
Chuck Bryant
All right, great.
Josh Clark
So. Oh, yeah, like I said, people have known about Saturn for a very, very long time. And in fact, I think 2,500 years ago, the first people to document it were the Sumerians. And not too long after that, or around that time in India, the world's oldest astronomy book, the Surya Siddhanta. Obviously whoever wrote it was like, I'm gonna try to guess the diameter of Saturn. And I don't think they guessed at it. Like, you know how many jelly beans are in this jar? Kind of guess. Like, they used math and geometry and all sorts of great stuff.
Chuck Bryant
Sure.
Josh Clark
But this is long before they should have. So what makes it impressive is that they were only off by a thousand miles. So today we believe that the diameter of Saturn is about 74,580 miles. In the Surya Siddhanta, they guessed 73,000 or estimated 73,580. That, my friend, is remarkable.
Chuck Bryant
Yeah, regular Lewis and or Clark kind of. Weren't they famous for like, almost guessing the distance?
Josh Clark
Oh, yes. Yeah, great. Great analogy. Sorry, it was lost on me at first.
Chuck Bryant
So the name itself, Saturn, is named after Saturnus, which is the God of agriculture and harvest. So it came from the Romans. And, you know, Saturn goes pretty slowly across the sky. So the day Saturday is named for Saturn, which is the last day of the week.
Josh Clark
Yeah.
Chuck Bryant
And now we're gonna compare Saturn to Earth in a lot of scintillating ways. And we could start with just the massive size because it makes Earth look like just a pea in a pocket. Basically.
Josh Clark
It makes it look like a nickel. If. If Saturn was a volleyball. NASA loves that one. If you ever look up Saturn analogy, NASA uses that every chance they get.
Chuck Bryant
I wonder if when they got. They got the nickel part and they were like, all right, well, we got to find something laying around here that's as big as this distance. And some guy was like, you know, there was. There was one sporty guy in the corner, like practicing setting a volleyball spike. He said, what about Jim over there?
Josh Clark
Is that low hanging fruit Phil who is about to do that?
Chuck Bryant
Oh, man, poor Phil. But you know, you're right. Nickel compared to a volleyball is pretty good. But let's talk equator. The equator is close to 10 times larger than Earth at 227 miles around compared to Earth's piddly little 25,000 miles.
Josh Clark
Yeah, it's got an extra spare tire compared to Earth's, you know.
Chuck Bryant
Totally.
Josh Clark
One of the things about Saturn, though, if you aren't like an astronomy type, the kind of planet that Saturn is, is a gas giant, which means that it's made largely of gas or gases. So to be a gas giant, you don't have to just be a big ball of gas, but you're made of things that typically are considered gases on the periodic table. Let's just get that straight right out of the gate. Okay.
Chuck Bryant
Right.
Josh Clark
But if you put the whole thing together, Saturn doesn't have a surface to speak of. If you did go far enough in toward the center, you might eventually hit something you could stand on, but you would be under so much heat and pressure that you wouldn't be thinking about standing on the surface anymore. You'd have other problems.
Chuck Bryant
Yeah, it's a very not dense planet and some say could even float in water if there was water that large.
Josh Clark
A pool.
Chuck Bryant
Yeah. Or, I don't know, a pond.
Josh Clark
Sure. Isn't that what they call lakes up in the Northeast?
Chuck Bryant
You know, I don't know the difference between a pond and a lake.
Josh Clark
In Maine, there is no difference.
Chuck Bryant
I would think a pond is human made, but there are many human made lakes too, so I don't know. I'll have to look that up.
Josh Clark
I always assumed it was size like. Pond is smaller, lake is larger. Well, that's what the L. That's how.
Chuck Bryant
You remember Lake L. Large L and pond puny.
Josh Clark
Nice one.
Chuck Bryant
I mean, that seems obvious, but surely there's something else. But maybe not. We'll look into that. More to come on ponds and lakes.
Josh Clark
Okay, I'll keep talking while you look it up.
Chuck Bryant
I was gonna talk. So why don't you look it up? Earth is the third planet out. As Modest Mouse will tell you, they're about 92 million miles away. Or we are rather. Saturn is the sixth planet away. The sun. And things really pick up after you get away from Earth. 886 million miles, which is going to mean they're going to be a very cold planet because they get not nearly as much sun. They get about 1.2% of the sunlight that we get, which means the average temperature in the upper atmosphere, Saturn, is a very chilly negative 220 degrees Fahrenheit.
Josh Clark
Or negative 140 Celsius for our non American Liberian, or can't remember the third one, friends.
Chuck Bryant
That's right.
Josh Clark
So there's some other interesting things that happen because it gets such little sunlight. But one of the things that astronomers were surprised by at first was Saturn's atmosphere. That is very cold, but it's not nearly as cold as you would expect for how far away from the sun it is and how little sunlight it gets. And they finally figured out the reason why is because Saturn generates its own internal heat. That's why it's not as cold as it should be.
Chuck Bryant
That's like me.
Josh Clark
Yeah, exactly. You could never be cold if you tried, man.
Chuck Bryant
I've been cold. And when I get cold, I have a very hard time warming up.
Josh Clark
I meant in like the figurative sense, you know, like really?
Chuck Bryant
Oh, like a cold, emotional individual.
Josh Clark
Yes, yes. Oh, well, thank you. So there's a couple other things about being that far away from the sun. I think it takes 80 minutes for sunlight to get there. That's a long time to stand around and wait for sunlight. We only have to wait like eight minutes here on Earth.
Chuck Bryant
Yeah. So when they flick that switch on, you just gotta hunker down.
Josh Clark
Right. And then. So in its orbit around the sun, it takes almost 30 Earth years for Saturn to complete. A year.
Chuck Bryant
Yeah, because you know, they're rotating very, very quickly on its axis. Second fastest in the solar system. Second just behind Jupiter. But if you're talking rotation speed here on Earth, we're going at about 978 miles an hour. Saturn is, wow, 23,000 miles an hour.
Josh Clark
Yeah. Almost no more than 23 times faster than Earth.
Chuck Bryant
And that's going to give it a short day, about a 10.7 hour day.
Josh Clark
Yes. And here on Earth, for comparison, a day is more than 20 hours long.
Chuck Bryant
That's right.
Josh Clark
So I said earlier, Chuck, that Saturn's a gas giant, and the two gases that it's most fond of are hydrogen and helium. And overall, I think the composition of its atmosphere is about 3/4 hydrogen, 1/4 helium. But in the planet itself, it has far less hydrogen than helium. That's about all you really need to know about those two for now. But the, the point of the whole thing is that there is an atmosphere, there are different layers, and the atmosphere itself is about 37 miles thick. And it is just generally gas. But it's also super freaky, as we'll see. But if we zoom In a little further drop down a little further into Saturn, into its center, and we make it through the 37 mile thick atmosphere. We're suddenly going to find out that the pressure is extraordinarily great in the next layer, which is a layer of liquid hydrogen.
Chuck Bryant
Yeah. And it's liquid hydrogen because of that pressure. It's the, it's just such a massive planet that here on Earth, if we want to make liquid hydrogen, you have to cool that gas down to very, very low temperatures, like negative 423 degrees Fahrenheit. But it's just the pressure on Saturn, even though those are high temperatures, that pressure alone can make that gas a liquid, which is incredible.
Josh Clark
It really is. And then it gets even crazier because so further in toward the core, toward the center of the planet, that liquid hydrogen turns into a completely different kind of thing that they call liquid metallic hydrogen. It's still again on the periodic table, the gas, even though it's in liquid form, but it behaves like a metal in that it can conduct electricity. So imagine hydrogen gas conducting electricity. And once you put your, your head back together because it got blown so wide open from that, you will understand now how he is generated inside Saturn. It's from that liquid metallic hydrogen just acting like it ain't, ain't supposed to. The reason why is because it's so compressed from the pressure toward the center that everything, even the electrons, you remember, like electrons are, they are to, like a nucleus of an atom. What you know, I think the outer planets in our solar system is to the sun, they're really far away from it. This pressure is so great in Saturn's center that their electrons are touching. It's all mushed together. And that's why it's behaving weirdly, because the electrons can conduct electricity a lot more easily.
Chuck Bryant
And then if you want to go further down to the core, you talk about hot, we don't know for sure because you can't get in there. They've tried. But the current belief right now is that it's basically compressed molten iron and to a ball about the size of 55 Earth and a temperature of about 15,000 degrees Fahrenheit, which is hotter than.
Josh Clark
The surface of the Sun.
Chuck Bryant
Hot, hot stuff in there.
Josh Clark
But if we're going to compare core to core, the core of the sun is 27 million degrees Fahrenheit, not 15,000, you know. Yeah, I saw one other thing about the core of Saturn and then maybe we'll take a break. Apparently some researchers have concluded that it's actually slushy. So it's not solid, which makes sense. I mean, you'd think it'd be kind of molten or in some weird state. But that it's also made of in addition to iron, ice, rock, and gas. And how there could possibly be ice In a core that's 15,000 degrees Fahrenheit is totally beyond me. I couldn't see a good explanation of this whatsoever. It's possible that the researchers who've proposed this completely off their rockers. I don't know. But I thought it was worth mentioning because I think that's fantastic. If it is true, and hopefully there's a stuff you should know. Listener who is out there is like, glaive. And I'm going to email in and explain to Josh and Chuck how there could possibly be ice there.
Chuck Bryant
That would be great.
Josh Clark
Yep. Okay. You want to take that heretofore promised break?
Chuck Bryant
Yeah, let's do it. And we'll be back on. I don't know. Let's talk about, like, how Saturn was formed to begin with right after this. All right, so there are a couple of theories about how Saturn was formed. If you're a. If you're a regular human walking around planet Earth, you might hear both of these and say, sounds like. Like you're kind of talking about basically the same thing. Yeah. If you're an astrophysicist, you might glaven out, as you mentioned before, that's two glavens. And say, oh, no, no, no. It is a very polarizing question in astrophysics. And to us, this difference is very large.
Josh Clark
So.
Chuck Bryant
Yeah. So if you're an astrophysicist out there, this might really excite you. If you're not, I would dare you. I would urge you to try and be delighted in the minutiae of the difference of science and how important that can be.
Josh Clark
The. The question about how Saturn or gas giants like Saturn form is more polarizing than the proposal to rename Uranus.
Chuck Bryant
Right.
Josh Clark
If we work together, that's two.
Chuck Bryant
That's two.
Josh Clark
So I'm going to explain the difference because I find this fascinating. There's the main generally accepted model of how planets form, including gas giants like. Like Saturn is called the core accretion model. And that is basically when a star forms, like our sun, it forms out of dust and gas and all sorts of crazy stuff. And there's a lot of other debris that starts swirling around it, forming a disk, and that's where planets form from. There's all sorts of collisions and Things get bigger and kind of clumped together. And as they get bigger, they attract more stuff. And the closer you are into the closer you are to the star, the more likely you are to attract heavy stuff like, say, iron, nickel, stuff that makes up rocky planets. Right? And everybody's like, core accretion model. That's just how planets form. But then there's some. There's a group of, like, renegade astrophysicists led by a guy named Alan Boss, who are basically like, no. That leaves a couple of questions out there. One is that there's less rocky debris in the outer reaches of this disk that's swirling around the sun. So, you know, how can a gas giant be made out of rocky core? And then secondly, that the remnants that are out there, say, like dust and gases, like hydrogen and helium, they will float away into outer space and out of the solar system and out of reach before a gas giant could form using the core accretion model. So what they've come up with instead is called the disk instability model. And they said, you don't need rocky stuff like iron and nickel to form a gas giant. It forms from gases from the start. And the core accretion model people said, okay, smart guys, how. How could that possibly happen? And the disk instability model people said that that swirling disk becomes so compressed and so dense from swirling around the sun for so long that when it breaks up, some of that dust and gas has enough density that it can attract other dust and gases and hence form a gas giant. And the core accretion model people were agog.
Chuck Bryant
I love that word, by the way.
Josh Clark
I do, too. It works really well.
Chuck Bryant
Well, another remarkable thing about Saturn are the just incredible storms that happen around Saturn. There's a very large temperature difference between the very hot interlators that we were talking about. Again, remember how many degrees Fahrenheit?
Josh Clark
We said, but 15,000?
Chuck Bryant
Yeah, 15,000. And then the very icy up atmosphere out there is very, very cold, I see, obviously. And so near the equator, you're gonna have winds that are going about 1,000 miles an hour. You've got a very erratic atmosphere. So it's not like it's just constantly stormy. There may be years that go between storms, but then they might go through a storm that lasts, like, literal years and years and years. They photograph one with the Cassini probe in 2010. And this storm was so big, and this is, you know, on a big planet, that it went all the way around and met itself like a single storm system like Ouroboros. Yeah, that is just. I mean, we've seen some crazy storms here in recent years where, like, you know, from middle Mexico all the way up through like the northeast of the United States. And I'll look at a Doppler and be like, that's incredible to see a storm that large. So imagine one going all around the entire planet of Earth and then imagine Earth size in relation to Saturn and that'll kind of tell you how big of a storm we're talking about.
Josh Clark
Yeah, it's absolutely nuts. And the reason why that it's got such a crazy atmosphere is because of that temperature difference, the temperature gradients. Remember we were talking about how tornadoes form on Earth and the tornado alley short stuff that you have to have a temperature gradient. Apparently the same thing happens on Saturn as well. But there's also, Chuck, a really weird weather system that does not come and go. It's essentially a feature, it seems like, because it was first photographed in 1981 when the Voyager 2 probe did a flyby of Saturn. And when the Cassini mission arrived, I think in like 2009 or 10 or something like that, it. It saw that the exact same thing was essentially there. So what they figured out is it's not a storm, it's a really, really fast jet stream. But the thing about it, the. I'm sure people out there who are familiar with jet streams are like so big. Whoop. Well, get this. This jet stream forms a hexagon around the top of the planet. It's one of the weirder things I've ever seen.
Chuck Bryant
Yeah, it's like you said, they photographed it in 1981. And then I think the Cassini Huygens mission ended in 2017 and it was still there and still basically looked the same. And I can only reckon that it's still like that today.
Josh Clark
Yeah, I think that's a good.
Chuck Bryant
Reckon we're talking 500 mile an hour winds at the center of this vortex. And they think that weird shape is due to the really fast rotation which makes a bulge at the equator and flattens things out at the pole. So it's just created this really strange kind of jet stream, this strange shape.
Josh Clark
Yeah. So I think, Chuck, we can't really put it off any longer. I believe that it's time to talk about Saturn's rings because, I mean, imagine if we didn't in this episode.
Chuck Bryant
Yeah, I mean, you mentioned, you know, it's not the only one with rings. I know you mentioned my anus.
Josh Clark
Sorry, that's three.
Chuck Bryant
I know that's the lowest of low hanging fruit, though.
Josh Clark
Phil would be like, it's fine.
Chuck Bryant
Yeah. Phil would love it. But Neptune and Jupiter, I'm not sure if you mentioned those. Those are some other ringed planets, but Saturn's are like, those are the showstoppers. They're incredible. If you've ever, you know, do yourself a favor if you've never looked at like real pictures, like telescopic pictures of Saturn, like, do so because it's incredible looking these pictures.
Josh Clark
I have an anecdote about that.
Chuck Bryant
Let's hear it.
Josh Clark
So remember we did an Australian tour a few years back.
Chuck Bryant
It was great.
Josh Clark
Yes. Yeah. It was on one of the days off. Yumi and I went to the Sydney Observatory one night.
Chuck Bryant
Oh, cool.
Josh Clark
And they had. They just happened to have one of their telescopes trained on Saturn and you could lean over and look through the eyepiece. And we did. And both of us just started laughing because it looked so fake. Like a little white cutout of Saturn. Just as could be. It just looked like they were like, we can't find Saturn, so we're gonna.
Chuck Bryant
Have to put this slide in.
Josh Clark
Yeah, exactly. But the volunteer was looking at us like, what are you. What's so funny about Saturn? Basically we just moved along. But that's my Saturn anecdote.
Chuck Bryant
And you said it looked fake. And he's like, that's real, man.
Josh Clark
No, we didn't bother to say anything. It was mine and Yumi's little joke.
Chuck Bryant
That was the worst Aussie accent I've ever done. And I've done some pretty good ones over the years.
Josh Clark
You have?
Chuck Bryant
I don't know what happened.
Josh Clark
It sounded like Billy Ray Cyrus trying to do an Australian accent.
Chuck Bryant
It came out so wrong. It was very strange. It sounded better in my head right before I said it. So, yeah, anyway, aside from the telescope slide fake, it's just incredible looking. And the sort of knockout fact is we're still not exactly sure where these rings came from.
Josh Clark
And we've known about the rings. So remember, people have known about Saturn since we started looking up at the sky, but you can't see the rings. But right when people started inventing telescopes, they noticed that Saturn had something weird going on. In 1610, Galileo, the astronomer made famous by the Indigo Girls, he spotted Saturn's rings in his telescope, but it wasn't of high enough quality for him to be like, those are rings. He thought they were like bulges on the side, like. Like handles on a pot or something like that. He wasn't quite sure what the heck it was. He actually, I think, thought it was like a three body system, like two huge moons and a planet. And it wasn't. But I mean, 50 years later, I guess even less that. Christiaan Huygens said, I've got a much better telescope now and those are rings. I bet my bottom dollar on it. That was his famous quote.
Chuck Bryant
You know what Galileo's crime was?
Josh Clark
Loving too much looking up the truth. Is that what the lyric is?
Chuck Bryant
Yeah. That's a great song.
Josh Clark
Sure it is.
Chuck Bryant
You know, I went to the same orthodontist as Emily from Indigo Girls.
Josh Clark
Oh, that's great.
Chuck Bryant
That's my claim to fame.
Josh Clark
Did I Can't even come up with a joke. But yes, that's great.
Chuck Bryant
Shout out to oh God. Dr. Blake. Hope he's still around. He may not be. This is in the 80s and he was in his probably. I mean he looked 70, but that means he was probably 50, right?
Josh Clark
In the 80s, sure.
Chuck Bryant
Yeah. And just for my teenage gays, you.
Josh Clark
Know, I was gonna say that was mean. Like this is like a recent person he went to.
Chuck Bryant
No, I mean he could still be around. He could be in his 90s, probably, but I hope he is. I hope he's still putting braces on kids.
Josh Clark
Yeah, they don't want him, but he's doing it anyway.
Chuck Bryant
He's putting like 1980s braces on kids, though they've come a long way. And he's like, no, these metal bands go around your teeth.
Josh Clark
The lip slashers.
Chuck Bryant
Oh God. All right, so back to the rings. They are 95% ice. It's rock and ice, but 95% of it is ice. And these are particles. But when you say particles, it could be a particle, like a sandy grain, but it could also be like a large boulder. Like they vary widely in size. And here's the thing about those rings too. They are very, very wide, but comparatively they are very, very thin. I think the farthest ring, which is 175,000 miles from the upper atmosphere of Saturn, is 7,000 times the diameter of the planet, but only about 30 to 60ft wide or thick, I guess.
Josh Clark
Isn't that nuts? Yeah, I mean, that's crazy. Like how does that thing even exist is my question.
Chuck Bryant
Well, we're about to tell you.
Josh Clark
So if you look at Saturn, especially through a Sydney based telescope, you're going to see that it looks like it basically like kind of cocked its rings to the side. Like a hat, a jaunty cap, as I put it.
Chuck Bryant
Yeah, I do that sometimes with certain caps.
Josh Clark
Exactly. Who doesn't? Everybody's familiar with that. Yeah, the thing is, Saturn's not doing that, actually. If you straighten Saturn out, its rings would be roughly parallel to its equator. It turns out that Saturn itself is jauntily cocked to the side too, to the tune of 27 degrees. And Earth's axial tilt, I think is what it's called. So the tilt relative to the, the plane of orbit around the sun. Flat plane, tilted planet. Let's just leave it at that. Earth is 23 degrees, so 27 isn't that much more. But Saturn's rings, like really point out how angled the whole thing is.
Chuck Bryant
Yeah, yeah. If we had a little jaunty cap, then Earth would look jaunty as well, I guess.
Josh Clark
Yeah. But the other thing about it too is with an axial tilt that pronounced like Earth's and like Saturn's, that's how you have seasons. Some parts are closer to the sun at different times of the year. Same thing on Saturn. But since Saturn's years are almost 30 Earth years long, that would mean that the seasons are like seven years long on Saturn. Yeah, neat. Seven year spring. Who wouldn't want that?
Chuck Bryant
That's a good band name right there.
Josh Clark
It is. It really is, Chuck.
Chuck Bryant
These rings are separated. Obviously when you look at them, you can tell there are gaps in between. And some are brighter than others, some are more dense than others. And because of that, they, you know, when they noticed the rings, they didn't know about all of them. They were discovered individually over time and named A, B, C, D, E, F and G in order of when they were found. But that's not the actual order of where they are. If you just started at Saturn and worked your way out in that case it would be D, C, B, A, F, G and then E. The best.
Josh Clark
Mnemonic device I could come up to remember that is don't choose brunch and forego grits and eggs.
Chuck Bryant
That's pretty good.
Josh Clark
Yeah, I thought so too.
Chuck Bryant
I thought just a nonsense joke was coming my way. But no, that one actually made sense. Yeah. Nice. Nice work. Phil approves.
Josh Clark
Good. Thanks, Phil. So if you ever noticed Saturn's rings also, there's like dark stripes in between them. That's actually voids in between the rings. Right. That Saturn's got tons of rings. Some are bigger than others. And when you kind of look at them from afar, it just looks like they have, what is that? Seven, seven rings. There's actually way more. These are just the rings that we can see and identify and they're, they're differentiated by these gaps and there's A huge gap, I think, between the B ring and the A ring. So it's about in the middle of Saturn's rings. It's called the Cassini Division, and it's about 3,000 miles across.
Chuck Bryant
Yeah, it's a big gap.
Josh Clark
Yeah, it is a big gap. And to kind of put this in perspective, especially for our American friends, if you took Seattle and you took Boston and you erased the country in between them and replaced it with the void of space, the people in Seattle and Boston could look out from one another across what was roughly the size of the Cassini division. I like that analogy. I don't know what's so funny about it.
Chuck Bryant
Danny, how far is 3,000 miles?
Josh Clark
Okay. But it was the. Replacing it with the void of space that I think really drove it home, if you ask me.
Chuck Bryant
Yeah.
Josh Clark
Do you know how long I went into a distance calculator to figure out two cities that most people know are roughly 3,000 miles apart?
Chuck Bryant
Did you come up with that?
Josh Clark
Yeah.
Chuck Bryant
So the Cassini Division, the cause of that whole thing is the interaction, gravitationally speaking, with the moon. And we'll talk about the various moons coming up. But the moon, I guess. Is it Mimas? It's not Mimas, is it?
Josh Clark
I've been saying Mimas.
Chuck Bryant
Yeah, I've been saying Mimas in my head.
Josh Clark
Although Mimas makes sense, too.
Chuck Bryant
Yeah, but I like Mimas.
Josh Clark
Okay.
Chuck Bryant
Cause it's not Titan, it's Titan, depending.
Josh Clark
On where you live, though, I guess so.
Chuck Bryant
But the particles in that B ring orbit about two times for each of Mimas trip around Saturn. And each time they're gonna pass, Mimas has the chance to inflict a little gravitational influence on those particles, and that just accumulates, basically, and it creates a very steady gravitational force on those particles and just going to hold them right there in place, and they're not going to drift into the gap. They're going to stay nice and tight.
Josh Clark
Yeah, that's pretty cool. That's how the. That's how the Cassini division is created by that gravitational pull. And meet. Mimas also is nicknamed the Death Star because if you look at a picture of Bemis, it looks an awful lot like the Death Star.
Chuck Bryant
Yeah.
Josh Clark
And the Death Star, that's a. It's like a space fortress in the Star wars movies.
Chuck Bryant
That's no planet.
Josh Clark
That's right. But no, it's a moon.
Chuck Bryant
Oh, that's no moon. Was that what it was?
Josh Clark
No, I'm saying he was right. It isn't a planet, it's a moon.
Chuck Bryant
I can't Remember the line though, Was it? That's no planet. I think that's what it was.
Josh Clark
I'm pretty sure. Wasn't that Han Solo saying that?
Chuck Bryant
Yeah, I think so. But you know, it's no big deal if you get Star wars stuff wrong, right?
Josh Clark
No, everybody's very easygoing about that stuff.
Chuck Bryant
Should we. No. Should we break or should we not?
Josh Clark
Let's talk about how the rings formed and then we'll come back and talk. No, let's take a break.
Chuck Bryant
You want to take a break?
Josh Clark
Yeah.
Chuck Bryant
Okay. And then we'll talk about how those rings form right after this.
Josh Clark
So, Chuck, you said a little early on, I think, that the people who study this kind of stuff are not 100% sure how Saturn's rings formed. Right. There's a lot of different competing theories. There's a whole camp that's like, they're as old as the planet, so they're multi billion year old rings. And other people are like, that's just stupid. And specifically, there's a researcher from NASA who in 1986 wrote a paper. His name's Jack Conerny. I don't think he actually said your idea is stupid to other people. But what he did do is he calculated the rate of what came to be called ring rain. And that is those particles falling into Saturn into. And when they do that, that ring becomes slightly depleted. And it happens more and more and more. And on the scale of tens or hundreds of millions of years, Saturn is eventually steadily losing its rings. And apparently the particles fall into Saturn when they become charged. And I guess they're more attracted by Saturn's gravitational pull. They travel down the magnetosphere. Just like particles bombard Earth's magnetosphere and produce the auroras. Same thing happens to Saturn, but it's paying the price. It's at the expense of losing its rings.
Chuck Bryant
Does it become part of Saturn itself? Does it suck that up into Saturn?
Josh Clark
Yes, I believe so. And I think it melts as it gets further and further toward the center.
Chuck Bryant
Okay, so Saturn isn't necessarily becoming larger as the rings deplete.
Josh Clark
No, Leon's becoming larger.
Chuck Bryant
Okay, so all right, that means a lot of stuff. That means that we are living on Earth at a time where we just happen to live. And it's a long period of time. But if you zoom out on a macro level, cosmically speaking, it's not that long. But we happen to be living in a time where we're probably at like peak ring. Don't you think?
Josh Clark
Yeah, because guys like Jack Connery calculated that Based on the rate of ring rain, the rings probably aren't more than 100 million years old. Right. So 100 million years before this, Saturn wouldn't have had rings then. They also calculated 100 to 300 million years, hence Saturn's not going to have rings either. The way that they came up with that 100 million year old estimate is because any older than that there should be far less rings based on the rate of ring rain. And if it were younger, there should be more rings than that. So that group is pretty self satisfied right now.
Chuck Bryant
Yeah, I bet they are. We also talked about, well, we still haven't really talked about where the actual stuff that makes up those rings come from. And again there are competing theories, one of which is that there used to be. And again, we'll get to the moons. Saturn has lots of moons, but one theory is that there used to have even a lot more moons than they have now. And one of those moons that may have existed, they actually named Chrysalis, was a little bit of a push and pull with Titan, the largest moon. A gravitational battle or Titian. Or Titian, yeah. It fell out of orbit because of that battle. I guess Titan wins. And Chrysalis veered too close to Saturn was basically just busted apart by the gravity of this enormous gas giant. And then that debris field is what formed that ring. And then over time, over millions and millions of years, Chrysalis continued to sort of crash into itself and created like the smaller rings around itself or above.
Josh Clark
And below and also some of the bigger ones because you know, like you said, some of the, some of the particles in the rings are like grain of sand size, but other like boulder size. And those boulder ones are just ones that haven't crashed into the proper other boulders yet to create those sand grains. They just, it's just a matter of time eventually.
Chuck Bryant
Yeah. What's the other theory?
Josh Clark
There's another theory which by the way, Saturn apparently is like a thunderdome for astrophysicists. There's so many different theories about so many different things.
Chuck Bryant
Yeah.
Josh Clark
But the other theory is that a bunch of Saturn's moons collided together. It wasn't just one getting pulled towards Saturn. They all just kind of got all tripped up and boom, boom, boom, boom, boom, boom. And all of a sudden you've got this debris field that got smaller and smaller, more particulate over time. Just like the Chrysalis theory too.
Chuck Bryant
So they don't fight over this one probably as much.
Josh Clark
Not as much. But they do dress like Master Blaster when they talk about It. They just don't actually fight.
Chuck Bryant
Some of these rings are formed by these moons. There's one called one of the moons Enceladus.
Josh Clark
I'm going with Enceladus.
Chuck Bryant
Enceladus.
Josh Clark
Okay. Enceladus sounds way too much like salad.
Chuck Bryant
Yeah. Encelada.
Josh Clark
Yeah.
Chuck Bryant
This thing is erupting salt water kind of constantly into the atmosphere, and that turns into ice crystals. And those ice crystals, as we see, can very easily form into rings. And that is, in fact, where we get our E ring around Saturn. If, you know, you're looking at the letters. So I guess the A, B, C, D, E. The fifth one discovered.
Josh Clark
Well, no, remember, they are out of order. Oh, yeah, the fifth one discovered. You're right. Sorry. Nice save. So there's also another ring that they discovered as recently as 2009. Like, because our telescopes just keep getting better and better, From Galileo's in 1610 to the Spitzer Space Telescope. Surprisingly hard to say. Yeah. They found a new ring that basically follows the orbit of Saturn's furthest moon out. Phoebe Buffet.
Chuck Bryant
Yeah, that's right. I was gonna say Bridgers, but sure.
Josh Clark
Yeah. Yours is a little more arthousy than mine.
Chuck Bryant
Oh, I love that boy genius record. So good. I believe Phoebe's is a very faint ring. Is that right?
Josh Clark
Yeah, yeah, yeah, it's very. That's why it took so long for us to find it.
Chuck Bryant
Yeah.
Josh Clark
I think we knew Phoebe existed. The moon. It could be foebe. They might be pronouncing it like that, but we didn't know the ring was there until 2009.
Chuck Bryant
Yeah, but the reason we're mentioning all this is the fact that those rings are. They're dynamic, they're changing, they're reshaping. And like we said, in, you know, maybe as little as 100 million years, they may not even be there.
Josh Clark
Yeah, I just think that's really fascinating. You know, you can thank the good Lord that we're alive at a time when Saturn has rings and we have telescopes.
Chuck Bryant
That's right.
Josh Clark
So we also talked a lot about the moons just now. And it turns out that Saturn's moons are really fascinating in and of themselves. It has a bunch of moons, as many as 146 that we know about right now. Just last year. Well, two years ago, when this comes out in 2023, the International Astronomical Union, they added 62 more moons. And I don't know if they were saving up and just wanted to do a batch edition of moons.
Chuck Bryant
Yeah.
Josh Clark
If they found a bunch in quick succession, I'm not sure, but they're like. There are definitely more moons there.
Chuck Bryant
Yeah, more moons coming. I mean, because. Yeah, just a couple years ago there were under 100. Now there's 146. So big changes. So keep collecting those moons, everybody, and hit us in a few years with a number that's going to knock our socks off.
Josh Clark
Collect all 146.
Chuck Bryant
That's right.
Josh Clark
So the other thing about the moons too, is that they orbit outside of the rings, which makes sense because the moons that were inside of the rings were what make up the rings, probably.
Chuck Bryant
Yeah.
Josh Clark
So these moons haven't smashed into anything else and they're just orbiting around. And like you said, Mimas, that one exerts a gravitational influence that creates the Cassini division, which means that it's really close to those rings. It's actually the nearest moon to Saturn's atmosphere. But it's only about half the distance of the moon we have here on Earth, which is about 237,000 miles, as every shining fan knows.
Chuck Bryant
That's right. But this thing hauls. It has an orbital speed of about 32,000 miles an hour. It's so fast that it completes an orbit in less than an earth day, about 22 hours. And if you consider our moon here on Earth, what does it take about a month to complete its orbit? That's really cooking.
Josh Clark
In fact, the month is based on the moon taking a month. They're inextricable, basically.
Chuck Bryant
So Is their month 22 hours?
Josh Clark
I guess so, yeah.
Chuck Bryant
Because what was their day? What did you say their day was?
Josh Clark
10 ish? I think 10.6?
Chuck Bryant
Yeah, that's right, 10.
Josh Clark
So there's a bunch of different moons, different sizes, but Saturn has some really, really big ones. Titan, which we've already talked about, is enormous and it is a great moon. Its size is large enough that it can actually hold an atmosphere in place. It's one of the very few moons that we know about that has an actual atmosphere to speak of. And boy, are we gonna speak about it.
Chuck Bryant
Yeah. Titan is quite striking. It has mountains made of ice. It has seas made of ethane and liquid methane. So it's just an incredible moon. It has an atmosphere much like ours. It's composed of nitrogen, but it has an air pressure that just knocks ours out of the park. It's, I think, 150% stronger at sea level, which is gonna be like you'd think you were on LSD or something. If you plopped yourself on Titan and you would look around and you were being like, Wait, there's odd things happening. Like it's raining really slowly. And someone would say, well, what does that even mean? It's like, well, look at the literal rain. It's coming down at about three and a half miles an hour. On Earth, it rains down at about 20 miles an hour. And it just, it sounds funny and it looks funny.
Josh Clark
And one of the friends there was like, rain's a weird word. Have you ever thought about that word, rain?
Chuck Bryant
But why does it sound funny?
Josh Clark
Because the atmosphere is so thick that vibration sound can travel much more efficiently through it. So if you shouted like, hello, you would burst the eardrums of your friend on lsd.
Chuck Bryant
Yeah. If you said, look how slow the rain is, they just slip their hands.
Josh Clark
Over their ears and like double over in pain.
Chuck Bryant
But it's not a hospitable place. Like nothing could live on the surface of Titan. I think it has a negative 240. I'm sorry, 290 degree Fahrenheit, average temperature. And like we said, the liquids there are methane and ethane. So that's, you know, you can't do anything with those two.
Josh Clark
No, but there is a liquid ocean about 50 miles below the. The surface that methane and ethane and ice surface. And this ocean is actually made of salt water.
Chuck Bryant
Yeah, good fishing from what I hear for sure.
Josh Clark
But that's the point. They're like, wait a minute. There's salt water there. It's heated by the core of Titan. There's also hydrocarbons on the planet's surface. Like, if you put this stuff together in just the right arrangement, you might have some sort of bizarre form of life. Like, these are organic materials that you could conceivably create life from. So who knows what's swimming around or floating around in that ocean underneath Titan's surface. Yeah, that's why people are so jazzed about Titan.
Chuck Bryant
Yeah, totally. And it's Titan. I mean, come on.
Josh Clark
Yeah, you know, there's also. What'd you say? Enceladus.
Chuck Bryant
Enceladus, that's right. What'd you call it?
Josh Clark
I said Enceladus. You said something else that sounded like salad. Are you Enceladus?
Chuck Bryant
I think I said Enceladus. We'll let the listeners decide.
Josh Clark
Have you ever thought about that word, Enceladus?
Chuck Bryant
What's the deal with that one? I know it's about the size of Arizona and also has a saltwater ocean under the crust. That is so.
Josh Clark
So far, Titan's two for two that we've talked about. We've Talked about two moons and both of them happen to have saltwater oceans.
Chuck Bryant
Yeah, underneath.
Josh Clark
Yeah, that's a, that's a big one too. So like it's underneath its icy crust, which means that it's protected and heated. And heated so much in fact, that I think we said Enceladus. Now I don't know how to say it bursts ice from its ocean out into the atmosphere, creating the E ring, which is pretty cool in and of itself. But that also means that there's geysers. And where there's geysers, there's probably hydrothermal vents on the ocean floor, the floor of the saltwater ocean. And that means that life could conceivably create or start up there because that's a really popular theory these days about how life started on Earth around hydrothermal vents in the ocean.
Chuck Bryant
Yeah.
Josh Clark
So who knows? And then the Cassini probe wrote back, wrote home from camp not too long ago and was like, hey, I sampled some of this water and it's got some mind blowing stuff in there.
Chuck Bryant
Yeah, for sure. And you know, we mentioned earlier the Cassini spacecraft finished up in 2017. It was called the grand finale when it wrapped up its mission because it on purpose says like, hey, let's just get really close and just kamikaze this thing and just see what kind of readings we can get up to the last second there. So. So that's how it ended its mission. But there's a new one, Dragonfly, that's coming up, I believe, launching in 2028 and will arrive on Titan by 2034. So I mean, hang on to your hats, it'll be a decade, but then from now, but then we're gonna start get some. I mean, imagine the changes that are gonna happen between now and then.
Josh Clark
Yeah, for sure. And there's actually a really cool animation artist's interpretation of that grand finale of the Cassini probe that's worth watching on YouTube.
Chuck Bryant
Oh cool.
Josh Clark
You got anything else?
Chuck Bryant
I got nothing else.
Josh Clark
I got one more thing. It turns out in the northern hemisphere, September 2025 will be the best time to view Saturn because it'll be on the opposite side of the sun from Earth. So it'll be nice and bright and easy to see.
Chuck Bryant
Oh, cool. Well, we'll either think to remind you and we'll probably forget or. But I imagine that'll be a newsmaker. Like people on the news will be saying like, hey, go out and look for Saturn for sure. Might be able to see it with your eyeballs.
Josh Clark
Okay, well, Chuck mentioned eyeballs, so we have no choice but to unlock listener mail.
Chuck Bryant
Hey, guys, this is from Rockne. I'm the mother of one. This is nother, but I bet they meant mother.
Josh Clark
Probably.
Chuck Bryant
I'm the mother of one of your longtime listeners. I don't remember exactly when I started listening, but it was back in high school. I graduated.
Josh Clark
Wait a minute. Wait, wait, wait. So Rockne is the mother of one of our listeners? Rock needs to. Okay.
Chuck Bryant
I bet you anything they meant to say I'm another one of your longtime listeners.
Josh Clark
Oh, okay.
Chuck Bryant
Now that I'm reading it and doing the math. Okay, okay, here we go. Hey, guys, my name is Rock Me. I'm another. Another one of your longtime listeners.
Josh Clark
Nice.
Chuck Bryant
My girlfriend, Anna has never listened to a single episode of your podcast. English is her second language, so she's probably Anna. And English spoken word entertainment doesn't quite feel relaxing for her yet, so don't hold it against her. But over the past few weeks, I've been on a mission. I've been humming, whistling, and vocalizing the Stuff youf Should Know theme song nonstop around her, trying to make it familiar. And this past weekend, my experiment finally succeeded. I called her, humming it on her own, completely unprompted. I came clean, told her I'd been training her ears, explaining it's a theme song of my podcast. She's familiar with stuff you should know through my constant mentions, and she just calls it my podcast. We both had a great laugh about it. Recently, I heard a listener mail from a mom who casually used Clark as a verb. So I figured I'd share my similar success story. So thanks for over 1.2 decades of entertainment. And that is from Rockne.
Josh Clark
Thanks a lot, Rockne. We appreciate that. Thanks for trying to spread the good word by creating earworms.
Chuck Bryant
That's right.
Josh Clark
If you want to be like Rockne and let us know your situation. We love to hear that kind of stuff. You can wrap it up, spank it on the bottom, and send it off to stuffpodcastheartradio.com.
Chuck Bryant
Stuff you should know is a production of iHeartRadio. For more podcasts, my heart radio, visit the iHeartRadio app, Apple Podcasts, or wherever you listen to your favorite show.
Podcast Summary: "Stuff You Should Know" – Episode "How Saturn Works"
Release Date: January 2, 2025
Hosts: Josh Clark and Chuck Bryant
Production: iHeartPodcasts
In this episode of Stuff You Should Know, hosts Josh Clark and Chuck Bryant delve deep into the fascinating world of Saturn, the iconic ringed giant of our solar system. They set the stage by highlighting Saturn’s prominence as the sixth planet from the Sun and its distinctive rings, which have captivated astronomers and enthusiasts alike for centuries.
Notable Quote:
Josh Clark [01:04]: "We're actually going to zero in on one specific piece of stuff that's out there in space. A little planet called Saturn."
Saturn stands out as a gas giant, predominantly composed of hydrogen and helium. Its massive size makes Earth appear minuscule in comparison—“it makes Earth look like just a pea in a pocket” ([04:55]). The planet's diameter is approximately 74,580 miles, a figure remarkably close to ancient estimates by the Sumerians and the Indian astronomers of the Surya Siddhanta.
Notable Quote:
Josh Clark [03:41]: "They were only off by a thousand miles. So today we believe that the diameter of Saturn is about 74,580 miles."
Despite its distance from the Sun, Saturn's atmosphere isn't as frigid as one might expect, thanks to the planet’s ability to generate its own internal heat. This internal heat maintains atmospheric temperatures around negative 220 degrees Fahrenheit in the upper layers, which is "less cold than expected for how far away from the sun it is" ([08:13]).
Notable Quote:
Chuck Bryant [06:49]: "Saturn could even float in water if there was water that large."
Saturn has an exceptionally rapid rotation speed of about 23,000 miles per hour, resulting in a swift day lasting approximately 10.7 Earth hours ([09:54]). In contrast, Saturn's year spans nearly 30 Earth years, highlighting the planet's slow orbit around the Sun ([09:33]).
Notable Quote:
Chuck Bryant [09:40]: "A year on Saturn is almost 30 Earth years."
Saturn’s rings are a spectacular feature, composed of 95% ice along with rock particles. These rings are incredibly wide but astonishingly thin, with the farthest ring extending 175,000 miles from Saturn's upper atmosphere yet remaining only 30 to 60 feet thick ([26:34]).
Notable Quote:
Josh Clark [26:34]: "If you look at Saturn, especially through a Sydney-based telescope, you're going to see that it looks like it basically like kind of cocked its rings to the side. Like a hat, a jaunty cap."
The origins of Saturn's rings are still debated among scientists. Two primary theories are discussed:
Additionally, ice crystals from the moon Enceladus contribute to Saturn’s E ring, showcasing the dynamic and ongoing nature of ring formation ([38:07]).
Notable Quote:
Chuck Bryant [36:49]: "One of those moons that may have existed, they actually named Chrysalis, was a little bit of a push and pull with Titan, the largest moon. It fell out of orbit because of that battle."
A prominent feature within Saturn's rings is the Cassini Division—a massive 3,000-mile-wide gap caused by the gravitational interactions with Saturn's moon Mimas. This division illustrates the complex gravitational ballet that maintains the structure of the rings ([29:51]).
Notable Quote:
Josh Clark [29:51]: "If you took Seattle and you took Boston and you erased the country in between them and replaced it with the void of space, the people in Seattle and Boston could look out from one another across what was roughly the size of the Cassini division."
Saturn boasts a staggering number of moons—146 confirmed as of 2023, with more anticipated as discovery methods improve. These moons vary widely in size, composition, and characteristics, making Saturn’s moon system one of the most diverse in the solar system ([40:22]).
Notable Quote:
Chuck Bryant [40:22]: "If you find a bunch of moons in quick succession, I'm not sure, but they're like. There are definitely more moons there."
Titan, Saturn’s largest moon, stands out with its thick nitrogen atmosphere and liquid hydrocarbon lakes. The moon's surface features mountains made of ice and seas of ethane and methane, creating an environment that, while inhospitable by Earth standards, presents intriguing possibilities for exotic forms of life.
Notable Quote:
Chuck Bryant [42:30]: "Titan is enormous and it is a great moon. It has an atmosphere much like ours. It's composed of nitrogen, but it has an air pressure that just knocks ours out of the park."
Enceladus is another of Saturn's moons that has garnered significant interest due to its geysers ejecting saltwater into space, contributing to Saturn’s E ring. These geysers indicate the presence of hydrothermal vents beneath its icy crust, which could potentially harbor life.
Notable Quote:
Josh Clark [45:02]: "Enceladus bursts ice from its ocean out into the atmosphere, creating the E ring, which is pretty cool in and of itself."
Saturn experiences some of the most intense storms in the solar system, driven by extreme temperature differences. For instance, winds near the equator can reach speeds of about 1,000 miles per hour, leading to massive, long-lasting storm systems that can encircle the planet ([18:40]).
Notable Quote:
Chuck Bryant [18:25]: "There's a very large temperature difference between the very hot interlayers and the very icy upper atmosphere out there."
One of Saturn's most mysterious and enduring weather phenomena is its hexagonal jet stream at the north pole. First observed by Voyager 2 in 1981 and later by the Cassini mission, this six-sided storm structure remains a subject of research and fascination.
Notable Quote:
Josh Clark [20:55]: "It's a really weird weather system that does not come and go. It's essentially a feature, it seems like."
The episode highlights ongoing and future missions aimed at unraveling Saturn's mysteries. Notably, the Dragonfly mission is set to launch in 2028, arriving at Titan by 2034, promising to provide unprecedented insights into Titan's potential for life and its complex chemistry.
Notable Quote:
Chuck Bryant [46:37]: "There's a new one, Dragonfly, that's coming up, I believe, launching in 2028 and will arrive on Titan by 2034."
Concluding the episode, Josh and Chuck share a heartwarming listener story from Rockne, who successfully introduced his girlfriend to the podcast through a clever earworm strategy. This segment underscores the podcast’s impact and the strong community it fosters.
Notable Quote:
Rockne [48:38]: "I've been humming, whistling, and vocalizing the Stuff You Should Know theme song nonstop around her...she just calls it my podcast."
Stuff You Should Know delivers an engaging and comprehensive exploration of Saturn, blending scientific insights with relatable anecdotes and humor. Hosts Josh Clark and Chuck Bryant expertly navigate complex topics, making the wonders of Saturn accessible and fascinating for listeners new and old alike.
Final Thought:
Josh Clark [47:33]: "We are living on Earth at a time where we just happen to live. And it's a long period of time. But if you zoom out on a macro level, cosmically speaking, it's not that long. But we happen to be living in a time where we probably at like peak ring."
For more episodes and to continue learning about the myriad wonders of our universe, visit the Stuff You Should Know page on the iHeartRadio app, Apple Podcasts, or your preferred podcast platform.