What Was Oumuamua?

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Speaker 1: Hey, Daniel, do you ever think about what it would be like if we were visited by aliens? Oh? My god, I think about that all the time. Do you really what do you think would happen? Well, in my imagination, it always starts the same way. There's some sleepy guy in front of a terminal somewhere which starts to blink and then annoy him and wake him up, and he looks it up and he rubs his face and he goes, hmmm, that's weird. Isn't that what happens in like every single science witchian movie ever? Exactly? Um? And you know the cool thing is that it's actually happened a few times in real life. Yeah, that's right. Didn't happen just last year? Yeah, it happened last year. It also happened in the seventies when we got a weird signal from space called the Wow signal. So sometimes we do we see weird things coming at us from space. But it happened as recently as last year. That's right, last year. Was it aliens? We still don't know. We do know that it was weird, how weird? Unquantifiably weird? Was it? Um? I'm a little weird. It was more weird than you think. That's what I was looking for. Hi, I'm and I'm Daniel, and welcome to our podcast. Daniel and Jorge explain the universe, in which we try to take everything in the universe, including weird things from outer space, and explain them to you, even if they're inexplicable. That's right, even those unwanted visitors. What do you mean unwanted? I want a visitor, You want a visitor. Yeah, Aliens, come on down here. Tell us all about how the rest of the galaxy works. Tell us about the rest of the universe. We need some more data. I'm dying to know what's going on out there, aren't you? And slaves ITAs, You're so cynical. No, it's very likely if aliens arived that they will just take over and suck our brains out of our noses. But in the inter the short intermission before that happens, they might grant us some knowledge about the universe. And you know that could be worth it. You would trade it. You would be like, um, all yours, but first tell me what's up with Pie? You know, if I could have absolute knowledge of everything in the universe, Yeah, I might uh, I might be willing to sacrifice my brain for that. You're like, before you make me into a pie, please explain pie to me. That's right, exactly. Well, today on the podcast, we are going to talk about a visitor to our solar system, one that not not a single scientist can really explain. That's right. Last year of actually, a strange object passed through our solar systems from somewhere very far away, somewhere unknown, and there's a lot of weird things about it, things that we can't quite explain. So it's the opportunity to learn something about other parts of the universe. It's a very suspicious object, right, Yeah, I don't think you need to view it with suspicion. I mean it's strange, it's unusual, it's weird. We don't understand it. But I see as an opportunity. I mean, it's like we've been looking out into the stars for decades trying to learn about the rest of the universe just by looking, Right, wouldn't it be awesome if some of the rest of the universe came to us so we could just like, you know, hold it and play with it. Like the same reason we want to get rocks from the Moon and rocks from Mars. Wouldn't you love rocks from alien planets and other galaxies or other solar systems. Yeah, so you're saying it's it's more like conspicuous rather than suspicious. That's right. Yeah, it's um. It's conspicuously suspicious or suspiciously conspicuous and probably not omniscient. Um. But it hasn't answered any of our questions yet. So we have a lot of questions about this weird rock from outer space. That's right. Today on the podcast we'll be talking about what is it, Where did it come from, Where where is it going? Why did it stop by our solar system? Isn't it Hawaiian? Maybe just like Hawaiian pizza? I don't know. You know, the name comes from a word in the Hawaiian language, right, Mua means scout or like distant messenger or something. It's sort of a funny name. But be careful how you pronounce it because it's it's starts out with a letter that's not really a letter. It's like this, um, you write it as an apostrophe. It's a glottal stop. So I'm not even sure how officially to pronounce this thing. So not only is the rock weird, but the word for the rock is like difficult to understand. We should do a whole podcast on glottal stops on who names these things? Anyway, it's sort of a noble name. It's supposed to be a noble name. Like it's sort of like a like an explorer of the stars, right, yeah, exactly, So it's got that positive light on. It's not like invade or and destroyer of worlds or anything. Yeah, although scout that that makes me think of like an advanced count, you know, like a reconnaissance. Are you worried that aliens are gonna invade and eat you? Um? Yes? Um so yes. So this weird rock Omumu appeared in seventeen and we are still struggling to understand it, where it came from, what it was wise visited us, what it means, you know, was it artificial, was it natural? We still don't really know. Um And so we thought let's dig into it on this podcast and tell you all about how it's strange and how it's interesting and all the mysteries that still remain about this weird rock. Yeah, it was in the news a lot last year, right, yeah, because it it passed through and really made waves in the astronomical community. People were like amazed to see this kind of thing. We were wondering how far these waves in the astronomical community made their way into the general public. How many people out there have heard of or knew what is momma? Yeah? Was it only astronomers, was it astronomers plus everybody interested in alien visitation? Or was it everybody on earth that was captivated by the passage of this strange rock. We were curious. I just want to know how many people can pronounce it or spell it? That's zero. I already know the answer to that. So as usual, Daniel went out there and asked people in the street what was MoMA? Yeah? I asked them have you heard of omamua? And if they answered yes, I also asked them what they thought it was. Well, here's what people had to say. No, okay, no, I'm not I'm sorry, I'm not her. Yeah I did not okay, no I never heard of it? No all right, no, no, no, okay, yes, what do you think? It is? Probably just some kind of space debris. I did not hear about that, Okay, I just what do you think it was probably some kind of meteor. I just think it was like a like a meteor off. Okay, No, I did not know. Okay, alright, So about like fifty fifty half of the people seem to know or have heard about it, and have the people had no idea? I never heard of it. Yes, what do you think of the Astronomy Communities pr PR machine? Apparently it must be better than the aliens PR machinery, But don't don't you think they could have done mua mua with it? I think we should stop with the all right, that officially ends them puns. Yeah, most people had never even heard of this thing, which to me boggles the mind, Like what an incredible event to happen, and just for people to be unaware of it, you know it all the newspapers and people were talking about it. How could you just go through your normal life and not know that there's a potential alien ship flying through the Solar System? Right? I feel like maybe people are jaded, you know, when they see an headline it goes put possible alien visiting the Solar System. People just I don't know these days, it's all it's just kind of all part of the noise it goes through people's feeds. You mean, because the world is so crazy that doesn't seem so crazy anymore, or because you see that kind of headline pretty often. Well, I think it's because, um, like the headline itself sounds huge, but it's not like on the front page of newspapers or website, do you know what I mean? Like it it sounds like it should be a huge deal, but you know, obviously people are not freaking out about it. So you know, I think as as news consumers, you just assume that it's hyperbole or clickbait or something. Oh, I see everybody's lying, so everything must be a lie. Right, Yeah, that's a bummer. So when aliens, when aliens actually land, you're gonna be like whatever, you're just clickbait, go away. Well, I mean, it's not on the front page, right, Like, it's not you know, it's not dominating the conversation. It's hard for me to remember because I obviously pay attention to the scientific news, maybe more than the average person. To me, it was in the front of my brain for for a long time. Um, but yeah, maybe for the averag person it was just you know, a minor interesting thing that astronomers saw. Well, let's break it down for people. Um, so what was this thing called. So this is a thing that was seen by a telescope in Hawaii. It's called the Pan Stars telescope, and it basically just turned on. Is this gorgeous new telescope and they're supposed to be looking deep into outer space and understanding how the how the cosmos that are evolving, and how supernova are exploding and all that's kind of fascinating astronomical and cosmological questions. What makes that telescope gorgeous? It can see really far into the past, and so to me, that's just gorgeous. Like every time we open our eyes in a new way or open a new set of eyes, we see more of the universe, and the universe is beautiful. I mean that's purely subjective, but to me, when I look at in space, I see beauty, and so I love when we turn on new eyes and we can see new areas of the universe we've never seen before. And that's where the Pan Stars Telescope allowed us to do. Beautiful way to say it, And so they turned this thing on and pretty quickly they saw something weird. They saw this rock moving really really fast tom into our solar system, and you might think, well, there's a lot of rocks in the solar system, right, how can you tell that this one is weird? Or what's weird about this one? And the weird thing about this one where its direction and its speed? Wait, so why didn't other telescope see it? Why did it require this brand new, gorgeous telescope. Well, this is one of the more powerful telescopes we have. I think other telescopes could have seen it. There's also just a little bit of luck and who spotted it first. You happen to be looking in the right place, and also you happen to notice it. You know, a lot of times you turn on your telescope and you're looking for thing A and you accidentally discover thing B. But only if you're curious enough. Right, if you see something weird in your data and you're like, huh, I don't understand that, what could that be? You could just shrug and say I don't know whatever and move on with your life. Or you could follow it up and try to figure it out. And sometimes that's where the greatest discoveries are made. You know. That's how like Pluto was discovered it or that's how pulsars were discovered. All these things were accidents, is things. People saw something weird in their data. It didn't just blow off their curiosity. They followed it up, right. Yeah, that worked out really well for Pluto. I think Pluto's legal team is still fighting that battle. It's posthumous legal team. It's not dead. We didn't kill Pluto's still there, That's what the book says. So they turned on this telescope and they basically saw stars and things out there, and they saw one of them moving in a weird direction at weird speed. Yeah, and there's a lot of weird things out there. Right. We have planets in our Solar system. We have asteroids, we have we have a lot of asteroids. We even have comets, right, And commets move differently, but everything in the Solar System shares one feature, which is they're moving around the Sun. Right. They're gravitationally bound by the Sun. They're in a stable orbit. So even comets that come in every hundred years and then zoom out really far, they're still moving around the Sun right there there, and the focus of their orbit is the Sun. And this object was moving in a way that's totally inconsistent with being in an orbit around the Sun any orbit. Right, It was going way too fast in the wrong direction. You mean, we've never seen an asteroid or anything else. It wasn't revolving around our Sun. Is that what you're saying. That's exactly what I'm saying. We've never seen anything never. It wasn't gravitationally bound to the Sun. This is the first time we've seen something that looks like it came from another Sun. And we could tell just by the motion. Right, that's there's none from We'll talk later about what it looks like and how weird it is in the shape of it, but just from its motion, we could tell that it didn't come from our solar system because it was moving too fast or in a weird trajectory, or what do you mean both. It was moving in a trajectory that made it clear it was not going to stick around. Right. They saw it moving, and they could plot its speed and its direction, so they could tell where it was going to go, and they could tell it was just going to go right through our solar system. It wasn't moving around the Sun. So we could get lots of looks at it. It It was just going to pass through once, and how do we figure out how far it was? How do we figure out how far away it is? Um, that's a good question. You know. We did a whole episode about measuring distances to things, and so I think you can tell how far away things are using parallax seeing, you know, multiple measurements that that are spaced far apart, sort of the way your eyes work, and so within the solar system, I think that works pretty well because things aren't that far away. So you can tell how far away things are by saying how differently they look or how much they move from different viewpoints, So you multiple telescopes, or you look at the same thing over several days as the Earth is moving. That's a great question. I'm not sure, but that's how I would do it. And it wasn't just moving a little bit fast relative to our solar system. It was a moving something like twenty six kilometers per second faster than we were per second. Yeah, exactly, That's that's pretty fast. It's like, in a second, wish you just went twenty six kilometers. I wish I could go ko per second. You know, maybe Tesla's can do that. I don't know the too. What is it called the hyper exactly? It was basically hyperlooping through our solar system. Yeah yeah, it's fast, right, like it's um, nothing really moved that fast in our solar system. Um. Yeah, And even comets that approached the Sun they speed up really fast and then you'll go this fast right Yeah, so it was moving pretty quick. It's like seeing a freight freight train coming at in your direction really really fast, and you're like, Okay, that thing is not going to stop where I am. It's going so fast. Yeah, exactly, And fortunately it didn't pass too close to the Earth or unfortunately if you wanted us to get a better look. It passed within like fifteen million miles of the Earth. Wow, that sounds like a lot. Is that a lot? You know? It's um, it's a significant It's like, um, fifteen percent of the distance between the Earth and the Sun, so asteroids passed much closer all the time. Fifteen percent. So from here the Sun, it's a hundred million miles, million miles, million miles from here to the side. So it's it's pretty close. I mean, it's not like it went over our heads, like it came sort of into this solar system. Oh, it definitely went right through the solar system. Yeah. I think your freight train analogy is a perfect one. You know, you're in a house and you're here, this freight train rumbled by, and you're like, yesh, that was kind of loud and close and weird, and it definitely didn't stop in your town, right, just like blew right through like you weren't even there. That's frightening. Yeah, And and it's not even that big, you know, the thing is like it's we were not sure exactly because we don't have great pictures of it. It was moving so fast and it was so far away that we didn't that all of our telescopes just see it basically as a point of light. So we have some estimates for its size and its shape um based on you know, how we think it's rotating, etcetera. But the thing was not that big. Like the dimensions are like, you know, a few hundred meters in the longest dimension and like tens of meters or maybe a hundreds in the other. So we are lucky to even e this rock. You know, rocks can fly through our solar system without us noticing them if they don't like reflect light just the right moments so that we can see them from the sun, because these things don't glow right there dark unless they're reflecting light from the sun. I see. Wow. Okay, so let's talk about where it came from potentially or which from which direction it came, But first let's take a break. Okay, So I read that this object apparently came from Las Vegas. Is that that's right? It had a crazy night in Vegas. It has no explanation for why it's so weird, the home of rock and roll, right, so rocks that would make sense, and it just rolled on though our solar system. Yeah, um no, but you're close. It came from the direction of Vega, right. We can tell it's trajectory, and we um extrapolate back. We're like, oh, what's in that direction in the sky, and that the answer is Vega. Vega is kind of interesting because it's it's kind of a nearby star, right, think it's one among the sort of closer stars. Right. Yeah, but this thing, even traveling at its high speed, would take hundreds of thousands of years to get here from Vega. So it's close, you know, sort of on a galactic scale, but it's not really close on a you know, um, let's go out for dinner kind of scale. So it just sort of came from Vegas, from Vega, right, And again we don't know that it came from that system. It's just sort of answering the question what's in the sky in that direction? We can extrapolate back and say, oh, came that way, what else is there? But you know, Vega is in a different place a long time ago. Everything is rotating and moving and could have gone through that system also from another one. Right, we have no idea how long it's been bouncing around the galaxy. Right, and let's talk about kind of how big it was, because it's not like the size of Manhattan, right, Like it's it's more like the size of it's like the sky size of one skyscraper in Manhattan. It's like maybe up to a kilometer long and like, you know, fifty to a hundreds on each side, So it's it's about the size of a skyscraper. It's like the Empire State Building to zoom by exactly, or maybe it's the Las Vegas version. Isn't there one of those in Las Vegas. So somewhere between the Vegas empar Site building and the real Emparsity building was the size of this strange, mysterious object. Wouldn't that be amazing if we visited it and found that it had exactly the shape of the Empire State Building, that would be pretty odd. That would be more amazing. That would be a great twist ending to the science fiction movie Somebody's going to make about this thing, which started with a guy in a control room looking at a blinking light, going, that's weird. What's the Empire State Building doing there? It's supposed to be in Vegas. I mean it's not huge, but I mean it's not it's not like the size of the moon, or it's not the size of you know, the continent. It's like it's it's sort of like, well, how big you might imagine a spaceship to be. Yeah, exactly, it's a reasonable size for a spaceship, which led to a lot of speculation. Right, you might be thinking, all right, so it's a rock from another solar system. We got rocks, They got rocks. One of their rocks ended up in our backyard. What's the big deal? Right? But it's kind of a big deal because we don't expect to see this kind of rock. What do you mean in terms of its size or its speed or what. Well, these solar systems are really far apart, right, And yeah, we got a bunch of rocks, but most of those rocks are just sort of floating around our Sun, and occasionally one of them gets kicked off and floats away. But you know, to pass right through another solar system is just really small odds. The chances of the happening are tiny. Based on our understanding of how often the Sun sort of loses rocks and let them float into interstellar space, this should almost never happen, right, So it's like like a rock in our meteor belt. These are big rocks, but they hardly ever leave the Solar system, so it's weird that there would be one floating around randomly. That's right. And there are rocks in our asteroid belt. But there's also this big cloud of icy objects that forms comments called the Oort cloud o O r T, and it's a bunch of really loosely held objects from the Sun. And that's probably better candidates for how we might lose rocks. Um. And you know, they have models for how often does the Sun lose a rock, and so they can calculate if other suns are losing rocks about the same level, how often should we see one of these things? And you know they did the calculation and they're like, you know, if you turn on the pan star's telescope, what are the chances of seeing an extrasolar rock a rock from another solar system, like within the first few months, and the odds are like up to one in a hundred millions. You know, it's just not the kind of thing that happens very often because these other solar systems are far apart. Space is pretty empty. What I mean is you hardly have to worry about running into a rock if you're going between stars, Yeah, exactly. You know, it's like you build a golf course and then like a golf ball drops out of the sky and score the hole in one, and you're like, well, that's weird. Either golf balls fall out of the sky a lot more often than I thought, which makes this not so weird, or something really weird just happened, right, And that's the situation we're in. And so right there, it's odd, right, because it can tell you either that we were wrong, that maybe there are a lot more of these rocks than we thought, which is already sort of interesting after physically right to hear that space is full of interstellar rocks banging around, or you know, it was just a really really rare event, and you know, rare things happen, right, People do get holes in one act um sometimes when they don't expect. It's so rare things do happen. Or it's not just a rock, maybe it's something else, right, And that's why people dug in to understand, like what is this thing? What is it made out of? What else can we learn about it? Not only is it rare, but it was also going at a very rare speed, or like a very strange speed. Yeah, yeah, exactly. If you take the all the stars in our neighborhood, like our star and the nearby ones and the nearest few hundreds sort of in our galactic neighborhood, and you average all their speeds together, you get like, you know, imagine all those stars are like a sloshing ocean bouncing around. You know, Um, you gets sort of the average speed of that whole blob, right, And this thing was going at almost exactly that speed relative to us, right, which means you can sort of think of it like it wasn't moving. It was just sort of floating there in the galaxy and we moved through it. What what do you mean, Well, you can think if you think of like our galactic neighborhood is like an ocean, this is like a booey sort of floating in the ocean, right. And of course our sun is moving relative to the galaxy and our I mean everything is relative. Right. It passed through our solar system or we passed our solar system over it. Are the same statements, right, It's just how you think of the frame of reference, meaning like like we are the visitors to it. That's right. It was just having a nice picnic and we just sort of stormed down the loop. Are the freight train? Not it exactly. And it's it's a really odd kind of speed because it doesn't help us understand where it came from. Like, if it came from the neighboring star, we would expect it to roughly have that star's velocity with respect to the galaxy. Right, Um, if it came from another star, we you'd expected to have that star's velocity roughly, but it but no stars have this average velocity, right, most of them are moving relative to the galaxy. They're slashing around, So it's a pretty weird speed to have. It's an anomaly kind of like it's clear it didn't come from possibly the stars around us, And so the anomalies start to add up. Right, You're like, oh, well, maybe it's just a rock from another solar system. Um, okay, Well, actually turns out those are really rare. You're like, all right, well, rare things happen, but the rare things for this rock keep adding up. It's rare and weird in so many different, totally separate ways that it really makes you start to wonder. And I think the shape has allowed to do when capturing the public's imagination. Like, um, you know, if you had been like a like a ball or like a rock, like a you know, like a randomly shaped rock, then people would just say, oh, it's an asteroid. But the shape of it was also very very weird. Yeah, it's like ten times longer than it is wide right, it looks like a skyscraper. And they had all these drawings of like cigar shaped rocks or whatever, and let me just interject a little rant here about astronomy public relations. Every time we hear a story about astronomy, they always include an artist's conception what this thing might look like? Right, and it's and sometimes it's labeled very clearly artist conception basically made up, But often it's not. You know, it's just like they have this image that leads the article and people look at it like, oh, that's what it looks like, but we don't know what this thing looks like. Some artists sat down and imagined maybe it looks like this. Another artist would have made something totally different, and so it always frustrates me. I imagine, like in particle physics, can we have an artist and pression of what my data might look like? Come? Why do you guys do that all the time too? In particle physics? Don't you like the large hatdrink Clyder, Here is some big explosion with things coming out of the artist rendition those No, No, that's actual data, that's actual data. Sometimes we take liberties and we like, you know, higher clever cartoonists to make our stuff look more interesting, But we don't make up artists impression of data like that anyway. Um, Yes, this thing is like ten times longer than it is whine. Yeah, and that's kind of how a lot of times in movies a picture space ships right from alien civilizations, like long and skinny, kind of like the star the story in Star Wars. Would you buy that kind of space ship if you went shopping for one? It makes sense, right, I mean it's sort of like, Um, it's big, but you want it to be streamlined in a way. But why does it have to be streamlined? There's no atmosphere in space, right, Um, you can have any shape you want. It doesn't have to be space so dynamic. But was it going? Well? First of all, how did they know was that shape it was? If it was so far away and so small. Yeah, the reason they could tell is that it's um. The light from it was changing in a in a periodic way, and so they could tell had this shape not only because it was weirdly shape, but because it was tumbling. Right, So this thing is not moving in a smooth way like zooming along um in the direction of its length. You imagine a spaceship is long and thin, it's zooming sort of in the direction from its back to its front. Right, This thing is not. It's tumbling, right, it's long and thin, but it's tumbling like a you know, a tennis racket head over heels, right, it's um it's it's tumbling around a short axis. So that's not the kind of spaceship you want to ride in. There's like a fun spaceship for the hidians, you know, about five seconds and until you start vomiting in space, which I don't think it's very fun. Well you don't need you never know what A and he's are into. You know. Maybe that's now you're right. I'm always saying we should broaden our minds and so what aliens might be like, and so yeah, maybe aliens enjoy vomiting. I think you might be right there. So the way you could tell a shape by the way the light, even though it looks like a pinpoint, the way that light from that pinpoint was changing sort of told you that it was there was something in it spinning and it was roughly the shape. Yeah, And if something was spherical and it was spinning, then it wouldn't be changing its apparent shape to us, right, But if it's spinning or tumbling it has a long shape, then the part that reflects light keeps changing, right, and so you see more or less and more or less. And that's how they made these estimates. A lot of really good science went into extracting all this information out of a very small amount of data. Wow, it seems almost fantastical, like an artist rendition. But you're saying, like if it was a death star or circular, it would not the life from it wouldn't be it wouldn't vary. Yeah, exactly, it wouldn't vary. And so it's tumbling, which is odd also, but also the fact that it's so long and thin as unusual. I mean, we look around at the population of rocks in our solar system. You don't see rocks like that, Like, you know, rocks are mostly spherical because of gravity and collisions and stuff like that. Sometimes they get longer and thinner. But like maybe three to one or five to one, ten to one for a link to with ratio is really weird, okay, And there's other weird things about it, not just the shape, not just to be, not just the direction it was going. There's like these mysteries just keep compounding, Like we haven't even talked about the craziest one. It gets crazier, all right, gets so much crazier. Yeah, let's talk about that a little bit more. But first quick break, what's the next one? It's a very shiny apparently, Yeah, it's really really shiny. We're like, what is it? You know, we don't know what this thing is made out of? Um, but based on its size and it's it's cetera, we know that it's like ten times shinier than anything in any of our asteroids, you know, like, what is this thing? It's so bright, it reflects lights so much. We don't know what it's made out of. It. That's the only clue we have is that it's super shiny. Our asteroids are sort of mostly like dark gray, right, Like, yeah, I think they're they're gray or red based on how much iron or whatever they have in them. But this was a ten times shinier. So it's like a giant, gleaming, gleaming, silver, sparkling, shiny unicorn horn flying through space. I know it makes you wonder, like it gives you the image of a sparkling spaceship, right, um, so you gotta wonder, um and the thing that makes you think, wow, maybe this thing could be a spaceship is that as it passed through our solar system. So here's the weirdest thing. As it passed through our solar system, we can track its motion and we can predict its motion based on gravity. Right, if something is just falling through gravity, we can tell how it's going to go. But it didn't follow that path. It looks like as it went through our solar system it accelerated. What Yeah, they hit the gas. It hit the gas. Yeah, it came into our solar system and on its way out it floored it. It's like the freight train was going through your town and then and then it was thinking. The conductor was thinking, oh no, I'm not gonna stop here for sure, this crap hole. I'm just just gonna I'm just gonna, you know, step on the accelerator. Yeah, it's like, let's get out of town quick. Let's not exaggerate. It's already super weird. It definitely accelerated. It didn't like double its speed. It's a small effect, but it's definitely there. Definitely happened. Like we can measure it precisely enough to say that there was some acceleration and it wasn't just due to the sun or it wasn't like the Sun was pulling on it or anything. Well, the Sun was pulling on it, right, that's the gravitational force, but it moved in a way that required something else to explain it. It It requires the Sun's gravity plus an extra push. And that's the question. Where did that push come from? What what force did it use to accelerate? Yeah, exactly. And so before you go to like, well, there must have been an engine on it and it was, you know, hitting the gas on the way out, there are some other possible explanations like maybe it has ice on it, and when it came through the Solar system, that ice was melted, and that ice like it shoots out and forms a gas and basically forms like a tail like a comet, and that can give it a push like a rocket like it was. Yeah, but a natural rocket, not like you know, an engine fabricated in another solar system. It could just be like a block of ice on one side that's got turned into gas and that's how a rocket would work out. But they didn't see this gas, right, Yeah, they looked at it really carefully, and the thing has no gas around it, there's no tail, so there's no evidence of any ice turning into gas or anything like that, so we still don't understand it. Wow. Okay, So in case people missed it, this thing flew by our into our solar system and very close to the Earth. Yeah, exactly end of this weirdly shaved you know two asked accelerating shiny, strangely shaped object that we should never have seen. That is almost impossible for it to exist. Um, just went by our planet. It came by, it checked us out, and it hit the gas on the way out. And and you know, you might wonder, like, what are the other explanations for it accelerating? Yeah, like what's what's the most likely explanation? We don't have a most likely explanation. Another plausible one is maybe it's really big and flat. Right. If it's big and flat, then it can act like a sail. It can catch sort of the Sun's radiation and act like a sail in space. It's called a solar sail. It basically catches the solar wind. So one explanation for the speed, right, but none the acceleration. It doesn't explain all those other things. It doesn't explain all those other things. But it could explain the acceleration. On the other hand, if you're thinking, well, big and flat, that's pretty weird for a rock, right, Yeah, it is pretty weird for a rock. Nature doesn't make big flat sheets of material very often, right, You don't see those in our solar system. What makes that, well, civilizations, Right, So it's fantastic to think about. Maybe this is a piece of alien junk. Right, Maybe this is like space archaeology. Some ship blew up in a war somewhere a billion years ago, and this is just like a hunk of it flying through space with some sort of rocket attached to it. No, it could just be a big flat sheet of metal and it gets a little boost from the solar wind as it passes through, and that's why it's not just moving gravitationally. The acceleration could be explained it just if it had that shape. On the other hand, it could have been a purposely designed solar sale, right, that's a way to get around the galaxy. Build these sales and go from star to star and get a little push as you go by each one. Or you made me think of it was like a Shinese silver surfboard, like silver surfer Yeah, exactly, It's fascinating to think of all the ways that this thing is weird, and all the possible explanations that we we sort of hope for, right the ones we want, the stories we'd like to tell. And the thing I love about this object is that it resists conventional explanation. You try to come up with some explanation you think makes sense. No, well, how do you explain this? And how do you explain that it's got so many different ways of being weird? Which could mean either it's just kind of like a miracle, like this crazy unlikely event that happened, or maybe our view of the universe is totally wrong, and maybe maybe um, we got it all wrong and it's not that rare for this to happen exactly. So either it's a rare event and you know, we're just sort of lucky afternomically to get to see it, or as you say, it's less rare than we expect and maybe we'll see more of them, right, that would be pretty cool. Um, Or it's not a natural phenomenon, right, maybe it is aliens. Right, we can't rule that out, but in any case, it's gone right, it's it went by already it's gone if you wanted to know more about it too late, Yes, it's gone, but it's not too late to learn more about it. I mean we could potentially build like a fast rocket that takes a slingshot around Jupiter and zooms out there or something a long time to catch up. Yeah, it would take a long time to catch up to it, and by the time it did, it would be like twenty years before it got there and sent us pictures back and stuff. Who knows if we even have a society in twenty years, right, I send data back to the smoking rubble of Western civilization. That's a that's a cheery thought, right. The better opportunity is just to build a bigger telescope, oh to see it. But isn't it too late? Isn't already sort of? I mean it's leaving a twenty six kilometers per second? Yeah, But fortunately we've been building a really awesome new telescope for the last I don't know, en years, and it's going to turn on in a few years. It's called the Large Synoptics Survey Telescope, and it's going to be pretty awesome, and it's going to turn on in about three years and when it does, it's going to give us pictures like nothing's ever seen before. And um, and it might be able to give us good pictures of this crazy thing. But wouldn't it have been better to look at it when it was going through the Solar system? You know, I get a good look that. Um. Yes, it would have been um. But we didn't know it was coming, so we weren't prepared. We were lucky we even saw it. It was a short notice, yeah, exactly. Um, you know we saw it when it was already like deep into our solar system. It's not the kind of thing we were looking for, right. Nobody sets out to find these things because you expect them to never come. Well, that just kind of tells you that on a daily basis, like we are still seeing things about the universe that are completely inexplicable, exactly. And that's what I love about astronomy and space physics that almost every time we look out there in the cosmos, we see something crazy. Right, It's full of surprises. There's so many things out there which if we could see them or learn them, or if they visited us, would blow our minds with the way they change perspective about our lives and the universe and how everything works. Well, if you're an alien writing on and you're listening to this podcast, we just want to say hello, Thanks for visiting. Why didn't you stop and say hi? Was it our breath? Thanks for not sucking our brains out of our newses see you later, Thanks for listening everyone, see you next time. If you still have a question after listening to all these explanations, please drop us a line. We'd love to hear from you. You can find us on Facebook, Twitter, and Instagram at Daniel and Jorge as one Word, or email us at Feedback at Daniel and Jorge dot com.