All right, so Paul, I mean, it seems cool, but you're talking about we have a couple of hundred comments. So now you're saying, not only do we have a couple hundred, we have multiple times more than the Asheri Bell, which is already a lot. And we also now don't have one or cloud, but two that sometimes migrate in and out, or the periods of millions of years, it seems tedious, let's say. It's a lot of extrapolation. So we see, probably was good day to have a few hundred long period comments that have been all but spot-as-well enough. And again, this is not including the Jupiter Hayley start. Yeah, and from the energies of these, we extrapolate outwards from a few hundred comments to about a trillion in this giant cloud. We can't see, took it in the whole cloud. It's a bit light-year-in-size. In fact, two giant clouds, not just one, two for the price of one. We have the outer octane and the inner octane. And one's a light-year-away and one's much smaller, and they sometimes have gratt waves through the Milky Way that change them and move them in mygradem. Yeah, so I think a little bit of skepticism is probably an order here. I mean, hopefully I've explained the argument. Yeah, I mean, that energy curve is pretty strange. It's pretty convincing and it's pretty strange. Yeah, but it is a lot of extrapolation. So I wouldn't be entirely surprised if there's actually no such thing as an cloud in this, or something else possibly even weird going on out there. But heaven knows we can't see anything out there. Is there any solutions to this? Not really. I mean, people thought, I mean, we talked about how things get to take when they get away from the start. And that means even something the size of an Earth-like planet you can't see is out of the thousand-estronome of units. And these comets are much smaller than that. They're also almost black. And you're putting them out hundreds and thousands of times further. People thought maybe you could watch them go in front of another star. You can see that blocking out the light. And there have been attempts to do this. The trouble is one of these things goes in front of the disk of a star. It's going to be only block a very, very small fraction of a ladder. But maybe that's possible. I mean, we've gotten better techniques of doing this with exoplanets and even now exo-moons. So it seems plausible for a few. But again, it doesn't seem like we're ever going to be finding millions of these things. No, that's true. Another issue is whether these things could be responsible for mass extinctions on Earth. Yeah, I mean, that's kind of a, we looked at this a bit in the asteroid section in a part of the course. And it seems that if they come into the solar system, and you see, say we've seen hit Jupiter, do they hit Earth? Yep. I mean, long-period comets are our hearting. We've said that most of the asteroids are a big of now being mapped. There might still be a few out there. So there is still some risk. And there's still a risk of being hit by the small one that haven't been mapped. But of course, these long-period comets you can't predict them. Yeah, I mean, we do see them into, they're kind of, do-do-do-do-do-do, and all of a sudden, hey, they're there. Yeah, so in that sense, that are worst thing. We might pick them up between your bit of Saturn and Jupiter, which would give us maybe a year or two this morning before they hit us if we're lucky. But it's nothing like the hundreds of years of warning they're likely to get for most asteroids. Yeah. Luckily, the statistics seem to suggest it's a much smaller risk than that of meteorites. OK. On average, but there's long been a speculation that maybe the average hides variations. OK. So here's the basic idea. Now, this is probably not true. I'll tell you the basic idea first. If you look at, this is the extinction rate of microscopic underwater life forms. OK. And so these are different different gelontical periods. Yeah, exactly. I see. Triassic. Yeah, I figured that. Yep. And what you're basically doing is you take a bit of rock from the silica under a microscope and you see these microscopic sea fossils. OK. And every now and then you'll find that you're seeing different sea fossils. OK. And that probably indicates the previous bunch of wiped out and some new bunch came along. Yep. And so what you can basically say is how rapidly did they get wiped out? OK. And so what you're looking at here is how rapid the turnover of these sea fossils is. And you can see a number of extinction events. Yeah, I mean, because there's these huge spikes and then they fall off and then they go up again and fall off. Yeah. So most of the time, there's a steady turn of these species, but there are certainly particular times when you look at a rock just below and just above that layer. And there's a huge difference. Yep. OK. This is the one that killed the dinosaurs. Yep. So there's definitely ones that are even bigger than the dinosaurs. Yes. And the perma-traassic one here is the biggest extinction one on record. It's much worse than one that killed the dinosaurs. And this one gets all the immediate attention. Yeah. This is dinosaurs. But the claim, I mean, this one we think is the meter right, is talked about. But there are many other things that could wipe us out. But one possibility is maybe there's a periodicity to this. Oh, OK. If you look at the stage, people are thinking, maybe they happen every, because it kind of looks like here and then here and then here and here. Yeah. Now, trouble is humans are very good at spotting patterns whether on ten or even eight. I mean, I look at this and I say, it's got random spikes. It's not at all obvious to me there's any periodicity here. But people have tried all these fancy sort of cystical analyses. And of course, if you look at any sort of data long and hard, and if you're probably fine, something, that's right. It's just totally spurious. The urban brain is weird to find patterns whether on ten, because that's much safer than not firing and finding alignments about you. Exactly. That's right. It's a good thing. Yep. But one claim is there might be a 20-year, a million-year or 60-million-year periodicity. OK. And you can try and fit the few big extinctions up and maybe try and force them to fit this. And so the idea is that every 20 or 60 million years, there's a comment that comes in. Well, so the other question is, if there is a periodicity here, and I'm not talking about what there is, then what could cause these sort of things to happen? On a regular frequency, OK. So one possibility, which I was expecting for a while, is that maybe our son is actually a binary star. Oh, OK. Because he's not finding the stars. Of course, most stars are a binary, so it's a two-puls. Yeah, like alpha centaurion nearby, so. Yes. So our son being all by itself is actually quite unusual. But maybe we have a binary companion, which is a very small one, like a brown dwarf or a red dwarf star. Which we know there's a lot of. Yes. And maybe the spider cadence is a very long way out, like Proximate around alpha and beta centaurion. Yep. And in a very elliptical orbit, and right now, it's maybe a light year away. Even so, you'd think a star, a light year away, I mean, star shine. They're not affected by the same inverse fourth power of distance that planets are. That's right. There was some thought that maybe you could hide in the Milky Way, because there's a lot of other stars in the Milky Way. If it's right in front of the densest pots, the Milky Way might be hard to see. Because there's so many other further away brighter stars out there. And maybe it has a 20 or a 60-million-year period. And what it could do is when it comes closer, it could stir up the comet belt, maybe in an in-art cloud, or maybe in the clopper belt. And it's essentially then bummed barred the inner solar system with star. So it will go past stir up the comet. It's still would never come close enough to affect the orbits of the planets, but it could cause huge numbers of comets to come in. And so instead of being one big impact, it might be comet after comet. Yeah, yeah, yeah. Here comes another comet. It's Thursday bang. And so that's one possible theory. OK. When the first infrared satellite were launched, they discovered lots of these strange infrared source that couldn't be seen at visible wavelengths. That people, a whole conspiracy theory, started that this was nemesis and NASA was keeping it secret, don't scare us. There are infrared satellites and much better ones now. And they do spotless infrared sources, but these turn out to be distant galaxies, even things like quasars. Very distant, yes. Yeah, so we know what they are. It's nothing like this. And I think this has now ruled out the hypothesis that there is the spine restart. It's called nemesis, we do horrible things. And that's, it still has a life as an internet meme, but I think it's the infrared satellites have now pretty comprehensively ruled out. Because in fact, yeah, a lot of these actually have, like, neo-wise have been mapping the comets, in fact, to discover them. And the asteroid is in, if you can discover something four kilometers wide at that distance, you could probably discover something much, much bigger. So that theory is dead as a dawn, up in terms of the data. That was of course like many of these conspiracy theories. They never go away. They never go away. But people are still holding this as possible at mass extinction. And maybe they're thinking about some, maybe, it's above and below the plane of the galaxy. And maybe wherever it goes through the plane of the galaxy, the tides cause more to come in. And again, it doesn't really seem to work mathematically because the tides are actually pretty much the same no matter where we are and moving up and down. So I don't think that really works, but some people are claiming that. And I think it could be the case, is it just a star wanders past, and then a few million years later, a whole bunch of comets that were stirred up by that star come down. Come down, yep. And we don't really know which stars were near us, 60 or 240 million years. That's right. We can't predict the orbits that far ahead. So I guess it's possible. But it probably wouldn't be a quick extinction, because if something came past, it's going to stir up the comets, but these comets are all but sort of millions of years. Yeah, it's going to take a lot of time. So it'll be a steady bombardment over a few million years of comets. So I don't think it's taken very seriously. There are plenty of other things that can cause extinction, so it could well be the massive volcanic eruptions or response for some of these things. That's right. But it's an interesting idea. I don't know if the material is very much in it, but why could be proven wrong? OK. So potentially something to think about, but not something to lose sleep over. No.