Listen: Galaxy, Isaac Arthur, Rome discussed on Coast to Coast AM with George Noory
"And one thousand Katie, okay? Welcome back to coast to coast AM, our guest tonight Isaac Arthur, and we are discussing Arthur's research that he has got in his video series over at science and future ISM, and the links for everything Isaac Arthur are over at coast to coast AM, and you need to go and check it out. It's nothing like taking notes and getting your learn on Isaac. We were discussing right before the break, the need to leave the planet mega structures and Dyson spheres all kind of interconnected, certainly in your world to and if we decided not to leave the planet for whatever reason population decrease our resources were brought under control, and and we just decided not to do that is T also in that same position in that. That's where maybe the Fermi paradox could come into play where they just don't wanna be Bob. Oh, sure, we say that. We don't know what the answer the paradoxes, of course, yet. And we have to have these filters that might be what causes them less common. And one of the ones that get suggested is that we have many years behind us. But we still have some and fund and one was might be that just turns out that interstellar space travel is just not something that is possible a practical in so we actually have fatal some walking colonies out. They all alone among the stalls. We really can't save Shaw. It might turn out that it's quite possible. But we just don't really want to do it too. Just because you can call an is Hoda doesn't mean do. Although I think that we probably will at some point. So lots of exploration we've done and we've never backed away from challenges. So I think that we would and I would tend to think any species that had developed while technology would too and then the breaking news last year, which I covered sort of you know, it's still in the news is tabby star. K I see a four six twenty eight fifty two I've got it. It memorized. Right. That got to be pretty exciting. And I don't think the story has quite died yet. We haven't really solved it. But it certainly strongly suggested a mega structure, and that's what the news was reporting it as the possibility of an alien mega structure. What did you think? When the news first broke. Well, no, but I suppose toward it. And and I always to look these things and say, especially from our standpoint discussing mega structuralist, if this wasn't make a structural what sort of make a structural could it be and not the ones we normally what discuss really fit the Markle to well, which doesn't really mean. Too much you go back and ask NGOs in Rome. What a skyscraper is with distance. They they probably all gonna guess. So we don't know what format they might be building towards the ones we would normally say, and there's been quite a few suggestions for what it might be from a national standpoint. But it's just one examples of things that you know, we really need to get about look at and the next show telescopes. Well, hopefully, oh, tell us a lot more about objects that we find these anomalies, but we all constantly finding us kind of nominees. And we learn something new and different about each one. But tabby stall is is, you know, whether it's a natural source or something more official and a high tend to tilt toward the formal. It's gonna tell us a lot. More about the universe around us. Years ago, not not well, not terribly long ago. But fifteen years ago, we had an excellent planet count of one above one one. Yeah. Right. Six thousand. Yeah. Right. Yeah. Today, it's it's over four thousand officially logged in another nine thousand that are that are way that that are discovered but having been given catalogs yet. But that's the that's where we're at today. And now in the last few years, certainly since you've started your presentations now, the general understanding of our Milky Way is that we don't have ten planets out there. We don't have twenty. But that we have one hundred billion a hundred billion planets in our Milky Way. Now, it's an exciting. It's an exciting time to be an astrophysicist. Absolutely. Well, it's been exciting time since we invented the telescope. But these all great times, we could see so much more. We get to pick really big telescopes. A hundred billion plants is probably an underestimate that might be how many around stall. Was that all reasonably enough like vote and close enough? This Bill and sign that they'd be warm enough to have live, but this know probably going to be plants around almost every stall. And I would not be spies. We've Kellogg trillions of of plants just off and Lotos zones. And then of course, you have all those dwarf plans to we'll probably find another one hundred. So that wasn't alone solar system of the small though, Neptune. Lloyd's input noise. Sure. And the interview that I saw was a couple of weeks ago with an astronomer. He literally said if you want to go in find your own Exo planet, all you have to do is go to work for one night and you'll find one that's that's pretty nutty. Was this wasn't even a concept twenty years ago now? No, I, and it's it is just amazing how much easier what's gonna do though. Of course, they say that you do some decent Holloway to do that. But you can you know, we'll finding high stopped a lot fifteen thousand you include the candidates then. PBS finding went almost every day. So that's right. Yeah. It's it's it's extrordinary now to populate. Now. Let's let's go back to where we set this up with to populate the the Milky Way to go out and discover and to expand to grow you have to you have to increase your population. You have to find those resources, but eventually it's going to happen. Whether it's by us or by different civilizations. That are out. There could be millions of civilizations. We don't know or there could be one or two. But if it started how rapidly would our Milky Way get overtaken probably about a million years tops. I if you're limited to light speed and probably only factionalized point say ten percent of light speed. You can still colonize tile. Galaxy in a million years sounds like a lot of time to us. And it certainly isn't a short time. But. Compared to the age the galaxy. It's it's about a second in the course of a day. So it takes a little time to colonize a galaxy assuming you have the technology and expansion for it. And we would also have to be to see something like this is it would have to be at the right place at the right time in that. We have only been observing our Milky Way as it is right now. I guess a sense Edwin hobble, I guess if we go back, you know, nineteen Twenty-three nineteen twenty five so in a very very short window. We would have to be at the right place at the right time to see this occupation happen. Well, you'd have to be there. What was going on? But always taking place. It's sort of like, you know, seventy eighty thousand years ago. I can't remember that asteroid that was they hypothesized, but they said it will only maybe a few hundred humans left, don't quote me on that novel. And yet now the whole plan is for if you look around now for people with very fine them. But in those early days will be hard to find. So if somebody got gotten a headstone on us, you know, we would have any problems finding them that kind of context. So it does depend on you know, who showed up forced how fast the expanding and how many such civilizations exist. Is it just a few is, you know, mini poll. Galaxy is it only one post super quaestor? You know, we just don't know yet in terms of the distribution with a SETI because we have to know what to look for is is said he doing the right thing. I mean, what what do we need to see what is it that we need to look for when we're looking for this expansion of the universe into the Milky Way. I wouldn't say it's really getting along. The what city aims do is what it can. And either you look for the lowest hanging food force, which is the look for those radio signals. But you know, the realist about this. We don't know that anybody would necessarily be using radio signals or Omni directional signals like on right now, they might be using something that was a point to point like a laser. But you're they're looking for what the candidates the second half of that kind of research, which is just looking for, you know, things like Dyson spheres all very lowest make structural or k three civilizations, which is a galaxy spanning one. And it's not that we're necessarily are going to be able to find though that we have a method to look for them that way. And that's of course. So you look for what you can have a decent chance of finding. It may not be the best way to look, but it's the wants to fail. And if we are out looking at, you know with hobble and we're starting to see galaxies disappear. Because that's one of the things that we would see if if Dyson spheres are being built around stars and blocking out the stars, and they take over a galaxy. Then that means the light from the galaxy would not be reaching us and technically the galaxy would start to disappear because it's being overtaken. Yes. And no I for a classic Dyson Swamy or just transfer the visible light in into infrared waste heat. So you would be able to see that. We'd be scanning for that. Of course, assumes they they're using the same Atlantic's, we all which I think are pretty solid a lot Atlantic. We have only had two centuries. So it'll be might find a walk around one day. In that kind of case you see the galaxy cash slowly disappear. And if those the kind of civilizations that come into existence wasn't just swim out around the stalls and build massive collectors and habitats out each one. Then you'd actually be able to see these things disappear. And if they when you own galaxy you'd be wondering not who's living around those stalls, but what a stall was because you'd never see one day or two you had radio telescopes telescopes because nice guy would be black, right? Right. And the the other part of this is our son is extremely stable. Okay. We we've had a pretty good run a pretty good run with our son. And it's not the case. Even in our own Milky Way, where you've got a son that hasn't radically changed in four or five ten billion years because that's what it takes to to develop to develop life. I now every stall changed with time. And every one of them starts to warm up over time. We always talk about how son will one day expanded to being a vagina, but actually gets a little bit warmer. Each year goes up inviting us by about one percent for one hundred million years. I don't I have to check that. It just gets a little bit warmer with time and actually has been a ask for us as we are wondering why would be habitable for billion years ago because my battle, but you cold based on sunlight, but we look out of us dollars. And it'll be see how old they all. And how much to give an off based on their mass. And we say, well, these ones are younger, these ones auto get more live all son is remarkably stable, no freakishly south, but really quite stable, and we have no way of knowing how common habitable zone plants like. Go all at this time. We don't know how often you're gonna get off like planet in one of those Jones. We don't know how many those stall is all stable enough, and what whatever stability we need. And we actually don't know that that you really need a EBay off Leipheimer out of areas sunlight son to host life. It might be a much easier than we think it is what my turn out that. We all right. If the underestimating how how easy it is for life to evolve to why is it that our universe? And when I say our universe. I firmly believe there are infinite universe's out there. We are just this is ours, but our universe with the big bang the way that it happened here. We have life. Things are created here. Right stars planets things elements gases photons electrons, everything it's it's just her fict- gravity was at the right spot at the right time the right numbers where we have life in this universe. But if it was just a fraction off if one of those numbers were off we could be a universe full of just lifeless dust, right? Oh, definitely. Oh, this is what we called off the fine tuning concept in general. And and to be fair. We don't really know exactly how that ranges or that. They might not be other other islands of stability where you might get something akin to chemistry going on for different laws. Change us to divide a little bit change the strength of gravity little bit. And and things would not walk as the all right now, and especially can tell in most cases, they went walk it all get chemistry. But that's how to say by now. And of course, the look at that. Odd. It's staggering based on on what numbers people produce baffled basic models. The odds are so huge that you have to look at and say, well, we could just be the example. Well, we won the lottery because there was a vast number so number of universes and this just happened to life at all. Maybe this is the only universe, and we just really lucked out possibly to cyclic type of thing where was just keeps happy up expanding contracting or dying in place until eventually you get one that walks with live, or of course, the other options Allio potentially that would interest me which has many variations like well stimulation, hypothesis all vase geological options. And we don't obviously have any way of no yet. We don't even have basic test hypothesis. Well, how we'd find out what one we run the numbers like the numbers of us having to take a break here in sixty seconds. When a when we run the numbers Isaac numbers are numbers. That's it. And the odds are the number. Say possibilities are endless anything is possible. And right now, there is another planet out. They're identical to this one where there's a graduate in physics host talking to a radio host without that never left elementary school talking about the universe and the possibility of life out there and their names are Isaac and Jimmy.."