1 00:00:00,040 --> 00:00:02,080 Speaker 1: So let me ask you something. What would it take? 2 00:00:02,359 --> 00:00:04,200 I mean, what would it really take for the entire 3 00:00:04,240 --> 00:00:08,119 foundation of human civilization to be rewritten in a single day? 4 00:00:08,560 --> 00:00:11,240 Speaker 2: And you don't mean over decades or even years. 5 00:00:11,119 --> 00:00:13,720 Speaker 1: No, not at all. I'm talking about a compressed twenty 6 00:00:13,720 --> 00:00:17,199 four hour maybe forty eight hour period. You wake up 7 00:00:17,679 --> 00:00:21,000 and the world is fundamentally different. Your power grids, your 8 00:00:21,079 --> 00:00:23,760 history books, maybe even the laws of physics you thought 9 00:00:23,800 --> 00:00:24,519 were constant. 10 00:00:24,760 --> 00:00:27,760 Speaker 2: It's a terrifying thought. Yeah, and our sources suggests there 11 00:00:27,760 --> 00:00:32,159 are at least two very distinct ways this could happen. 12 00:00:32,520 --> 00:00:36,359 One is purely celestial, governed by orbital mechanics, it's completely 13 00:00:36,359 --> 00:00:37,039 indifferent to us. 14 00:00:37,039 --> 00:00:40,920 Speaker 1: And the other is terrifyingly intelligent and deliberate. 15 00:00:41,240 --> 00:00:43,320 Speaker 2: That's our mission for this deep dive. We're going to 16 00:00:43,359 --> 00:00:47,200 conduct a really rigorous analysis of the absolute maximum thresholds 17 00:00:47,200 --> 00:00:50,320 of existential threat. We're synthesizing the hardest data we have 18 00:00:50,399 --> 00:00:54,960 from astrophysics. We're talking confirmed interstellar visitors, the lethal physics 19 00:00:55,000 --> 00:00:56,200 of high velocity. 20 00:00:55,759 --> 00:00:57,759 Speaker 1: Impacts, and then we shift he as completely right. 21 00:00:58,119 --> 00:01:02,600 Speaker 2: Then we move into speculative astrobiology, first contact scenarios. But 22 00:01:02,679 --> 00:01:06,239 we're basing this on established scientific theories, things like the 23 00:01:06,239 --> 00:01:09,840 Fermi paradox. The goal here is that you leave with 24 00:01:09,920 --> 00:01:15,640 a comprehensive, really nuanced understanding of the staggering dangers, but 25 00:01:15,719 --> 00:01:18,920 also the mind blowing discoveries that are waiting just beyond 26 00:01:19,319 --> 00:01:21,799 the protective bubble of our solar system. 27 00:01:21,920 --> 00:01:24,439 Speaker 1: Okay, let's unpack this. We should start with the threats 28 00:01:24,439 --> 00:01:26,439 that well, they just don't care about us. They don't 29 00:01:26,439 --> 00:01:28,760 care about our armies, or politics or philosophy. 30 00:01:28,760 --> 00:01:30,920 Speaker 2: Its massive hunks of rock and ice. 31 00:01:30,840 --> 00:01:34,040 Speaker 1: Exactly, and they're moving so fast they basically break the 32 00:01:34,079 --> 00:01:36,560 cosmic speed limit we're used to in our own neighborhood. 33 00:01:36,879 --> 00:01:39,000 These things have a kinetic potential that could turn our 34 00:01:39,040 --> 00:01:41,439 planet into a steaming room. And we know they're coming. 35 00:01:41,560 --> 00:01:42,959 Speaker 2: We know because we've already seen them. 36 00:01:43,079 --> 00:01:46,480 Speaker 1: Let's start there with the visitors from deep space, the 37 00:01:46,519 --> 00:01:49,920 inevitable threat, the conversation about the very structure of our 38 00:01:49,920 --> 00:01:53,319 solar system. I mean, it fundamentally changed back in twenty seventeen, 39 00:01:53,560 --> 00:01:53,959 it did. 40 00:01:54,359 --> 00:01:58,120 Speaker 2: It changed with the confirmation of woom Wan. The official 41 00:01:58,120 --> 00:02:01,560 designation is one Eye twenty SI seventeen U one. 42 00:02:01,359 --> 00:02:03,879 Speaker 1: Which is such a perfect name if you know any Hawaiian. 43 00:02:03,920 --> 00:02:08,639 It translates to messenger from Afar arriving first. It really 44 00:02:08,759 --> 00:02:12,840 was the very first interstellar rock we ever confirmed, and it. 45 00:02:12,800 --> 00:02:16,680 Speaker 2: Proved unequivocally that our Solar system isn't some closed off bubble. 46 00:02:17,080 --> 00:02:20,560 It's more like a well, a shooting range for objects 47 00:02:20,599 --> 00:02:23,000 that are coming from completely different star systems. 48 00:02:23,039 --> 00:02:25,479 Speaker 1: What immediately set it apart, I remember, was just its 49 00:02:25,639 --> 00:02:27,960 raw speed. It was moving with an energy that was 50 00:02:28,080 --> 00:02:29,800 way beyond our local standards. 51 00:02:29,879 --> 00:02:33,599 Speaker 2: Far beyond. I mean objects that are native to our system, 52 00:02:33,639 --> 00:02:36,360 from the Kuiper Belt or the Oort Cloud, they travel 53 00:02:36,439 --> 00:02:40,080 relatively slowly compared to the Sun, they're gravitationally bound to it. 54 00:02:40,199 --> 00:02:41,719 Speaker 1: But not this one, not at all. 55 00:02:42,360 --> 00:02:45,599 Speaker 2: Uamua was clocked leaving our Solar system at eighty seven 56 00:02:45,639 --> 00:02:46,680 kilometers per second. 57 00:02:46,800 --> 00:02:49,280 Speaker 1: That's just it's hard to even picture fifty four miles 58 00:02:49,759 --> 00:02:50,759 every single second. 59 00:02:50,840 --> 00:02:52,840 Speaker 2: It was simply moving too fast to have ever been 60 00:02:52,879 --> 00:02:54,199 captured by the Sun's gravity. 61 00:02:54,240 --> 00:02:57,360 Speaker 1: It was just passing through and that velocity, that speed, 62 00:02:57,400 --> 00:03:01,560 it forced astronomers to create a whole new cataloging system. 63 00:03:01,280 --> 00:03:04,039 Speaker 2: Right it did. The eye designation was born from this 64 00:03:04,479 --> 00:03:08,000 I for interstellar and since it was the first, it 65 00:03:08,039 --> 00:03:09,759 got the number one one eye. 66 00:03:09,840 --> 00:03:12,400 Speaker 1: But the speed, as wild as it was, wasn't even 67 00:03:12,400 --> 00:03:13,479 the weirdest thing about it. 68 00:03:13,599 --> 00:03:16,599 Speaker 2: No, not by a long shot. That would have to 69 00:03:16,599 --> 00:03:17,560 be its geometry. 70 00:03:17,599 --> 00:03:22,319 Speaker 1: Its shape, right, Not our usual lumpy potato shaped asteroids, 71 00:03:22,479 --> 00:03:23,000 not at. 72 00:03:22,840 --> 00:03:27,159 Speaker 2: All, our models showed something highly unusual. It was extremely 73 00:03:27,159 --> 00:03:29,879 elongated and maybe up to ten times longer than it 74 00:03:29,919 --> 00:03:33,360 was wide. A giant space cigar. Yeah, or depending on how 75 00:03:33,400 --> 00:03:34,879 you look at it, maybe a flattened disk. 76 00:03:35,280 --> 00:03:38,080 Speaker 1: And to make it even stranger, it wasn't a smooth rotation. 77 00:03:38,360 --> 00:03:42,159 Speaker 2: It was spinning chaotically, tumbling on multiple axes as it went. 78 00:03:42,439 --> 00:03:44,520 Speaker 1: And this is where the science fiction writers and look, 79 00:03:44,560 --> 00:03:47,360 even some highly respected scientists just had a field day. 80 00:03:47,840 --> 00:03:50,840 The shape was weird, but the trajectory was even weirder. 81 00:03:50,879 --> 00:03:53,800 Speaker 2: The non gravitational acceleration explain. 82 00:03:53,439 --> 00:03:55,199 Speaker 1: That it was speeding up as it left the Sun, 83 00:03:55,439 --> 00:03:57,120 faster than gravity alone could. 84 00:03:56,919 --> 00:04:01,439 Speaker 2: Explain exactly, and that sparked this intense scientific debate. On 85 00:04:01,439 --> 00:04:04,960 one side, he has some pretty wild speculation. Could this 86 00:04:05,000 --> 00:04:07,840 be an alien light sail or some kind of probe, 87 00:04:08,159 --> 00:04:12,080 a piece of manufacture technology being pushed by solar radiation, 88 00:04:12,439 --> 00:04:15,240 which would explain that subtle little boost in speed. 89 00:04:15,680 --> 00:04:17,800 Speaker 1: You can see why that theory caught on. It's a 90 00:04:17,839 --> 00:04:21,959 compelling idea. But what did the majority of the scientific 91 00:04:21,959 --> 00:04:24,560 community land on for that mysterious boost. 92 00:04:24,800 --> 00:04:28,160 Speaker 2: The leading hypothesis, the non alien one, centered on something 93 00:04:28,199 --> 00:04:31,160 called outgassing like a comet. Like a comet, yes, but 94 00:04:31,199 --> 00:04:34,279 with a twist. Normally, when a comet gets near the Sun, 95 00:04:34,439 --> 00:04:37,360 the ice vaporizes and creates a visible tail a coma. 96 00:04:37,959 --> 00:04:40,519 That jet of gas acts like a tiny thruster, and 97 00:04:40,600 --> 00:04:41,920 that causes the acceleration. 98 00:04:42,120 --> 00:04:44,240 Speaker 1: But we never saw a tail on anymore or more. 99 00:04:44,160 --> 00:04:47,639 Speaker 2: We didn't, which is why scientists theorize that maybe highly 100 00:04:47,720 --> 00:04:52,560 volatile ices, specifically solid hydrogen, were sublimating beneath the surface crust, 101 00:04:52,879 --> 00:04:55,759 so the jets would be invisible. That hydrogen outgasing could 102 00:04:55,800 --> 00:04:58,879 account for that subtle, persistent acceleration, And. 103 00:04:58,839 --> 00:05:00,720 Speaker 1: The implication of that is still pretty profound. 104 00:05:01,000 --> 00:05:03,399 Speaker 2: Oh absolutely, It means we saw a comet that is 105 00:05:03,480 --> 00:05:07,040 chemically unique, maybe because it came from a completely different 106 00:05:07,040 --> 00:05:10,319 star system with a different stellar environment. So regardless of 107 00:05:10,360 --> 00:05:13,720 the explanation, um Umua was a cosmic scout. It was 108 00:05:13,759 --> 00:05:16,519 the proof we needed that these high velocity travelers from 109 00:05:16,519 --> 00:05:20,199 far away are they're not just possible, they're comments. 110 00:05:20,199 --> 00:05:23,240 Speaker 1: So if Umamooa was the messenger, our next visitor, three 111 00:05:23,240 --> 00:05:25,839 iat lists, discovered in twenty twenty five is more like 112 00:05:25,879 --> 00:05:27,040 an ancient history. 113 00:05:26,720 --> 00:05:29,319 Speaker 2: But a very, very old one. It's only the third 114 00:05:29,399 --> 00:05:33,040 interstellar object we've detected, which gives it the designation three Eye, 115 00:05:33,519 --> 00:05:36,560 and this one is far more complex and far older. 116 00:05:36,680 --> 00:05:39,399 Speaker 1: And that's what makes three iat lists so fascinating, right. 117 00:05:39,439 --> 00:05:41,519 It lets us look back in time, not just to 118 00:05:41,560 --> 00:05:43,160 the birth of our own solar system, but. 119 00:05:43,160 --> 00:05:45,920 Speaker 2: Way before that, to the epoch of the Milky Way itself. 120 00:05:45,959 --> 00:05:49,959 I mean our local objects, planets, asteroids, comets, they max 121 00:05:50,040 --> 00:05:52,120 out at about four and a half billion years old. 122 00:05:52,680 --> 00:05:55,000 But three IYATLSS is believed to have originated from the 123 00:05:55,000 --> 00:05:57,160 Milky Way's thick disk of stars. 124 00:05:56,879 --> 00:05:58,759 Speaker 1: Which is a much older part of the galaxy. 125 00:05:58,839 --> 00:06:02,439 Speaker 2: It's region associated with primeval stars from the galaxy's ultra 126 00:06:02,560 --> 00:06:03,920 violent early formative era. 127 00:06:04,279 --> 00:06:06,839 Speaker 1: So how much older are we talking and why does 128 00:06:06,920 --> 00:06:10,519 that age seven billion years or maybe even more make 129 00:06:10,600 --> 00:06:13,680 it so incredibly important for planetary science. 130 00:06:13,519 --> 00:06:16,360 Speaker 2: Because it's the closest thing we'll ever get to a 131 00:06:16,399 --> 00:06:21,079 pristine presolar sample of galactic matter. It's older than the 132 00:06:21,120 --> 00:06:24,519 Sun by billions of years. Its significance is what it 133 00:06:24,560 --> 00:06:28,120 tells us about how stars evolved, what raw materials were 134 00:06:28,120 --> 00:06:31,600 available for planets to form before our current generation of 135 00:06:31,680 --> 00:06:32,959 stars even existed. 136 00:06:32,680 --> 00:06:35,240 Speaker 1: And its composition is unusual. 137 00:06:35,560 --> 00:06:39,319 Speaker 2: Scientists are genuinely puzzling over its unique makeup. They're detecting 138 00:06:39,360 --> 00:06:42,279 surprisingly high levels of nickel and iron in the gas 139 00:06:42,319 --> 00:06:43,240 envelope that surrounds it. 140 00:06:43,360 --> 00:06:46,000 Speaker 1: Nickel and iron that sounds more like the core of 141 00:06:46,040 --> 00:06:49,000 a planet than a comet. It's just something metal rich, 142 00:06:49,079 --> 00:06:52,319 maybe heavily processed. It's not the dirty snowball we always hear. 143 00:06:52,240 --> 00:06:55,600 Speaker 2: About, absolutely not. It's a relic from an ancient metal 144 00:06:55,720 --> 00:07:00,240 enriched stellar population. Now, unlike Umuma three I atlists does 145 00:07:00,279 --> 00:07:02,560 behave like a classic common in some ways. It is 146 00:07:02,600 --> 00:07:05,480 a clear coma that gas and dust halo and a 147 00:07:05,560 --> 00:07:08,000 tail made of typical water and carbon dioxide ice. 148 00:07:08,240 --> 00:07:10,000 Speaker 1: But the age and the metals are what make it 149 00:07:10,040 --> 00:07:11,120 a scientific treasure. 150 00:07:11,360 --> 00:07:13,639 Speaker 2: It's a snapshot of the galaxy from a time before 151 00:07:13,680 --> 00:07:14,800 the Earth even existed. 152 00:07:15,079 --> 00:07:17,920 Speaker 1: Okay, so now for the crucial clarification, the part where 153 00:07:17,959 --> 00:07:21,240 everyone can breathe a sigh of relief. The actual path 154 00:07:21,279 --> 00:07:23,759 of three I atlists is harmless to us. 155 00:07:23,800 --> 00:07:27,560 Speaker 2: Correct, it's a close shave in astronomical terms, but we're safe. 156 00:07:27,879 --> 00:07:30,720 Its closest approach is schedule for December twenty twenty five. 157 00:07:30,800 --> 00:07:34,000 It's going to pass about one point eight astronomical units away. 158 00:07:33,800 --> 00:07:36,879 Speaker 1: Which is what about two hundred and seventy million kilometers. 159 00:07:36,959 --> 00:07:39,959 Speaker 2: Yes, so it's well outside Earth's orbit that will pass 160 00:07:40,000 --> 00:07:43,879 significantly inside the orbit of Mars. Is definitely harmless, but 161 00:07:44,759 --> 00:07:48,120 it also represents a profound missed opportunity. How So, because 162 00:07:48,120 --> 00:07:50,800 it's moving so fast, and because it's so old, getting 163 00:07:50,879 --> 00:07:53,720 a probe anywhere near it to actually study it, to 164 00:07:53,800 --> 00:07:56,560 analyze matter that's millions of years older than our sun, 165 00:07:57,319 --> 00:08:00,240 it's technologically impossible, given the short window we have even 166 00:08:00,240 --> 00:08:00,519 see it. 167 00:08:00,639 --> 00:08:02,680 Speaker 1: So let's pivot from the safe reality to the what 168 00:08:02,839 --> 00:08:05,480 if this is the heart of this deep dive. If 169 00:08:05,519 --> 00:08:07,720 this object had been on a collision course, what would 170 00:08:07,759 --> 00:08:10,160 that impact look like? And our sources say we should 171 00:08:10,240 --> 00:08:14,279 use the maximum estimated size five point six kilometers in diameter. 172 00:08:14,160 --> 00:08:17,360 Speaker 2: Right, So if a five point six kilometer ancient metal 173 00:08:17,360 --> 00:08:19,959 and ice comet we're heading straight for Earth, we would 174 00:08:20,000 --> 00:08:23,839 ignore the sensationalist alien probe theories and just treat it 175 00:08:23,879 --> 00:08:27,079 as a pure kinetic threat. And as we're about to see, 176 00:08:27,160 --> 00:08:30,360 it's the velocity at least sixty one kilometers per second 177 00:08:30,560 --> 00:08:32,799 that makes this scenario absolute catastrophic. 178 00:08:33,000 --> 00:08:36,159 Speaker 1: To really grasp the scale of an extinction level event 179 00:08:36,360 --> 00:08:39,639 or ele, we have to look back at our benchmark, 180 00:08:39,879 --> 00:08:43,840 the chick Selub impact sixty six million years ago, the 181 00:08:43,919 --> 00:08:47,559 dinosaur killer. That asteroid was roughly ten kilometers wide, and 182 00:08:47,600 --> 00:08:49,759 it was moving at about twenty kilometers per second. 183 00:08:49,759 --> 00:08:52,720 Speaker 2: Okay, Now contrast that with three I outlets. It's smaller, yes, 184 00:08:52,840 --> 00:08:55,399 five point six kilometers, but the difference in velocity is 185 00:08:55,440 --> 00:08:58,159 just staggering. Three eye outlasts is moving at least three 186 00:08:58,240 --> 00:08:59,679 times faster than chick Slub. 187 00:09:00,000 --> 00:09:02,360 Speaker 1: And this is where the physics gets really brutal. Why 188 00:09:02,440 --> 00:09:04,799 is that difference so critical? Why does three times the 189 00:09:04,840 --> 00:09:06,799 speed mean more than three times the damage? 190 00:09:06,840 --> 00:09:10,320 Speaker 2: Because kinetic energy is proportional to mass times velocity. 191 00:09:09,879 --> 00:09:13,159 Speaker 1: Square right equals mc squared, but the v version in. 192 00:09:13,080 --> 00:09:16,399 Speaker 2: A sense, it's one half mass ton velocity squared. So 193 00:09:16,440 --> 00:09:19,320 if you triple the velocity, you multiply the resulting energy 194 00:09:19,360 --> 00:09:22,799 by nine, assuming the mass is the same. Now even 195 00:09:22,840 --> 00:09:24,960 though three i atlas is roughly half the mass of 196 00:09:25,039 --> 00:09:28,080 chick salub, its massive speed advantage means it would strike 197 00:09:28,120 --> 00:09:30,879 Earth with approximately four and a half times the kinetic 198 00:09:31,000 --> 00:09:32,639 energy of the dinosaur killer, four and. 199 00:09:32,639 --> 00:09:35,000 Speaker 1: A half times the energy of the event that wiped 200 00:09:35,039 --> 00:09:37,759 out seventy percent of all life on Earth. Yes, so 201 00:09:37,799 --> 00:09:40,320 there's no ambiguity here. This isn't a regional disaster. This 202 00:09:40,399 --> 00:09:44,120 is a full blown extinction level event. Let's break down 203 00:09:44,159 --> 00:09:47,360 the two phases of this catastrophe, the short term chaos 204 00:09:47,440 --> 00:09:49,519 and then the long term planetary collapse. 205 00:09:49,799 --> 00:09:54,519 Speaker 2: The short term catastrophe is it's immediate, and it is devastating. 206 00:09:55,000 --> 00:09:58,000 The object, moving at sixty one kilometers per second, it 207 00:09:58,120 --> 00:10:02,320 punches through our entire appmisphere in about one second, yes second. 208 00:10:02,360 --> 00:10:04,200 It hits the ground with so much force that it 209 00:10:04,279 --> 00:10:08,320 instantaneously vaporizes the rock, creating a superheated core of plasma 210 00:10:08,360 --> 00:10:11,720 hotter than the surface of the Sun. The resulting crater 211 00:10:11,799 --> 00:10:14,320 would likely be over two hundred kilometers wide and many 212 00:10:14,399 --> 00:10:17,639 kilometers deep, far far larger than Chickilips. 213 00:10:17,879 --> 00:10:19,879 Speaker 1: Then comes the blast wave, and we're not talking about 214 00:10:19,879 --> 00:10:20,559 a hurricane. 215 00:10:20,679 --> 00:10:25,840 Speaker 2: No, this is a massive shockwave radiating outwards, creating super 216 00:10:25,960 --> 00:10:29,799 hurricane winds over one thousand kilometers per hour. It would 217 00:10:29,799 --> 00:10:34,879 flatten everything infrastructure, forests within a fifteen hundred kilometer radius 218 00:10:34,879 --> 00:10:35,720 of the impact site. 219 00:10:35,840 --> 00:10:39,960 Speaker 1: But the global killing mechanism, that's the ejected material, right. 220 00:10:39,879 --> 00:10:43,440 Speaker 2: That's the one. The force of the impact blasts trillions 221 00:10:43,440 --> 00:10:47,360 of tons of molten rock, dust, and water vapor high 222 00:10:47,399 --> 00:10:50,759 above the atmosphere. As all of this material rains back 223 00:10:50,799 --> 00:10:54,320 down across the entire planet, friction from re entry causes 224 00:10:54,360 --> 00:10:55,799 it to superheat. 225 00:10:55,440 --> 00:10:57,399 Speaker 1: Creating a global thermal pulse. 226 00:10:57,600 --> 00:11:02,440 Speaker 2: Exactly. It ignites simultaneous planetaries scale fires. Every tree, every forest, 227 00:11:02,519 --> 00:11:05,559 every flammable city on Earth would be burning within hours, and. 228 00:11:05,600 --> 00:11:08,480 Speaker 1: At the same time, the seismic effects would be off 229 00:11:08,519 --> 00:11:11,759 the charts. The impact would trigger earthquakes that register far 230 00:11:11,799 --> 00:11:13,759 beyond the limits of the standard Ripter scale. 231 00:11:13,799 --> 00:11:16,320 Speaker 2: It would cause immediate continent wide shifts in the crust. 232 00:11:16,600 --> 00:11:20,080 It would trigger massive volcanic eruptions across tectonic plate boundaries 233 00:11:20,120 --> 00:11:20,879 all over the world. 234 00:11:21,039 --> 00:11:24,120 Speaker 1: And if it hit the ocean, you get megasunamis. 235 00:11:23,440 --> 00:11:28,519 Speaker 2: Hi tsunamis, flooding continental shelves maybe one hundred kilometers inland. 236 00:11:28,360 --> 00:11:30,120 Speaker 1: And that's all just in the first twenty four hours. 237 00:11:30,120 --> 00:11:33,639 Now we get to the long term inescapable planet killers. 238 00:11:33,759 --> 00:11:36,840 Speaker 2: Yes, all that ejected to breathe, the dust, the soot, 239 00:11:37,159 --> 00:11:40,679 the vapor that got injected into the stratosphere, it starts 240 00:11:40,720 --> 00:11:41,960 to block out the sun. 241 00:11:42,000 --> 00:11:46,399 Speaker 1: Which leads to the nuclear winter scenario. The sky goes dark. 242 00:11:46,279 --> 00:11:51,120 Speaker 2: Global temperatures plummet, photosynthesis stops for years, maybe even decades. 243 00:11:51,559 --> 00:11:54,879 Plants die, and once the primary food sources are gone, 244 00:11:55,120 --> 00:11:58,360 the entire food chain collapses. So even if you survive 245 00:11:58,440 --> 00:12:01,200 the blast and the fires, you're with freezing and starvation. 246 00:12:01,360 --> 00:12:03,480 Speaker 1: And when the sky finally starts to clear, as. 247 00:12:03,399 --> 00:12:07,440 Speaker 2: It slowly clears, all that particulate matter begins to rain down. 248 00:12:07,679 --> 00:12:10,080 But because of the sulfur and nitrogen oxides created by 249 00:12:10,120 --> 00:12:12,320 the intense heat of the impact, this rain would be 250 00:12:12,399 --> 00:12:17,960 hyperacidic acid rain, destroying any remaining terrestrial life, any freshwater ecosystems. 251 00:12:18,039 --> 00:12:20,440 It would acidify the oceans, wiping out much of the 252 00:12:20,480 --> 00:12:23,399 marine life that somehow survived the initial seismic events. 253 00:12:23,600 --> 00:12:27,159 Speaker 1: And here's the final grim irony of it all. Since 254 00:12:27,240 --> 00:12:30,519 three ialys contains a lot of CO two ice, all 255 00:12:30,559 --> 00:12:34,240 that vaporided carbon dioxide doesn't just go away, No, it stays. 256 00:12:34,000 --> 00:12:36,240 Speaker 2: In the atmosphere. So after the sky is finally clear 257 00:12:36,279 --> 00:12:38,960 of dust, maybe five or ten years later, all that 258 00:12:39,000 --> 00:12:43,360 trapped CO two causes a massive delayed greenhouse effect. The 259 00:12:43,360 --> 00:12:46,279 planet then swings from a deep freeze into a scorching 260 00:12:46,320 --> 00:12:49,679 hot period of long term climate destabilization. 261 00:12:49,120 --> 00:12:51,679 Speaker 1: Making recovery for any life that's left even more. 262 00:12:51,519 --> 00:12:55,240 Speaker 2: Difficult almost impossible. The key takeaway from the three ietless 263 00:12:55,240 --> 00:12:59,200 scenario is that velocity, that interstellar velocity, is the decisive 264 00:12:59,200 --> 00:13:01,720 factor in an extingtion level event. We have to be 265 00:13:01,759 --> 00:13:04,960 able to detect and track these high speed galactic travelers 266 00:13:05,360 --> 00:13:07,000 far far in advance. 267 00:13:06,720 --> 00:13:10,759 Speaker 1: Because the universe offers up existential threats that are entirely random. 268 00:13:10,480 --> 00:13:12,080 Speaker 2: And completely indifferent to our existence. 269 00:13:12,159 --> 00:13:14,960 Speaker 1: Okay, that was intense, So we've established the universes actively 270 00:13:14,960 --> 00:13:17,799 trying to kill us with ancient high velocity rocks. Now 271 00:13:17,840 --> 00:13:20,960 we pivot to the pursuit of something well, infinitely more compelling, 272 00:13:21,320 --> 00:13:22,080 life itself. 273 00:13:22,399 --> 00:13:25,519 Speaker 2: The universe may offer catastrophic impact, but it also is 274 00:13:25,519 --> 00:13:29,399 potentially teeming with amazing complex existence. 275 00:13:29,759 --> 00:13:32,639 Speaker 1: We're shifting from the physics of destruction to the chemistry 276 00:13:32,639 --> 00:13:36,639 of creation, but searching for life, whether it's intelligent or 277 00:13:36,679 --> 00:13:41,279 just microbial. It requires some serious technological mastery and a 278 00:13:41,320 --> 00:13:41,679 lot of. 279 00:13:41,600 --> 00:13:43,519 Speaker 2: Patients, rigorous scientific patients. 280 00:13:43,600 --> 00:13:47,799 Speaker 1: Yes, the decades long search for extraterrestrial intelligence SETI, that's 281 00:13:47,799 --> 00:13:51,120 still crucial. Right Since nineteen sixty they've been scanning the 282 00:13:51,159 --> 00:13:52,360 cosmic background noise. 283 00:13:52,480 --> 00:13:57,840 Speaker 2: They're listening, listening for specific non natural signals, something that 284 00:13:57,919 --> 00:14:01,840 suggests a technological manue factored origin rather than just you know, 285 00:14:02,000 --> 00:14:03,600 a pulsar or a quasar. 286 00:14:03,960 --> 00:14:06,200 Speaker 1: Set he gives us a way to maybe detect an 287 00:14:06,200 --> 00:14:10,679 advanced civilization that's communicating. But the search for non intelligent 288 00:14:10,759 --> 00:14:14,799 life that's now dominated by our most advanced instruments, primarily. 289 00:14:14,399 --> 00:14:16,840 Speaker 2: The gems webs based telescope. We're not listening anymore. We're 290 00:14:16,840 --> 00:14:18,879 looking looking for atmosphere at signatures. 291 00:14:18,960 --> 00:14:22,000 Speaker 1: And the technique that lets JWST do this kind of 292 00:14:22,039 --> 00:14:27,320 remote chemical analysis is called transmission spectroscopy. For anyone less familiar, 293 00:14:27,320 --> 00:14:30,480 how exactly does this tool let us well sniff the 294 00:14:30,519 --> 00:14:33,080 air of a planet that's one hundred light years away. 295 00:14:33,240 --> 00:14:36,759 Speaker 2: It's an amazing technique. It relies on observing an exoplanet 296 00:14:36,840 --> 00:14:38,000 during a transit. 297 00:14:37,879 --> 00:14:39,679 Speaker 1: When it passes in front of its star from our 298 00:14:39,720 --> 00:14:40,519 point of view. 299 00:14:40,399 --> 00:14:43,559 Speaker 2: Exactly when it does that, a tiny sliver of starlight 300 00:14:44,039 --> 00:14:47,679 passes through the outer fringes of that planet's atmosphere different 301 00:14:47,759 --> 00:14:52,840 chemical gases like water, carbon dioxide, methane. They absorb very specific, 302 00:14:53,080 --> 00:14:54,279 very narrow wavelengths of. 303 00:14:54,320 --> 00:14:57,360 Speaker 1: Light, so JWST analyzes the light that makes. 304 00:14:57,279 --> 00:15:01,279 Speaker 2: It through precisely. By analyzing that spectrum of light, the 305 00:15:01,320 --> 00:15:04,480 telescope can map out exactly which gases are present, with 306 00:15:04,600 --> 00:15:08,159 their density, is the atmospheric temperature, and critically, it can 307 00:15:08,159 --> 00:15:09,360 look for biosignatures. 308 00:15:09,399 --> 00:15:12,559 Speaker 1: And this technique recently delivered one of the most promising 309 00:15:12,639 --> 00:15:15,600 but also one of the most deeply unsettling candidates for 310 00:15:15,679 --> 00:15:16,679 life we've ever found. 311 00:15:16,840 --> 00:15:19,240 Speaker 2: K two eighteen B, located one hundred and twenty four 312 00:15:19,320 --> 00:15:20,000 light years away. 313 00:15:20,159 --> 00:15:20,919 Speaker 1: Tell us about it. 314 00:15:21,240 --> 00:15:23,360 Speaker 2: K two eighteen B is what we call a super earth. 315 00:15:23,519 --> 00:15:25,320 It's about two and a half times larger and eight 316 00:15:25,360 --> 00:15:27,679 and a half times more massive than our planet. It 317 00:15:27,799 --> 00:15:30,519 orbits an M type dwarf star, and it's in what 318 00:15:30,600 --> 00:15:32,639 we believe is the habitable zone. 319 00:15:32,360 --> 00:15:34,960 Speaker 1: Meaning its surface temperature could support liquid. 320 00:15:34,639 --> 00:15:38,120 Speaker 2: Water in certain regions. Yes, but the headline discovery from 321 00:15:38,159 --> 00:15:42,559 JWST's analysis was the detection of two very specific molecules 322 00:15:42,559 --> 00:15:47,799 in its atmosphere, dimethyl sulfide or DMS and demethyl disulfide. 323 00:15:47,840 --> 00:15:52,320 Speaker 1: And why are those two molecules considered such powerful biosignatures. 324 00:15:51,720 --> 00:15:55,720 Speaker 2: Because on Earth the production of DMS is almost exclusively 325 00:15:55,759 --> 00:16:00,679 tied to biological processes, primarily marine phytoplankton and so and bacteria. 326 00:16:00,759 --> 00:16:03,759 The process sulfur compounds in water. While there are a 327 00:16:03,799 --> 00:16:07,039 few theoretical, non biological ways to make it, the high 328 00:16:07,120 --> 00:16:10,960 concentration they detected is highly suggestive that some form of 329 00:16:11,039 --> 00:16:13,360 sulfur cycling life is thriving there. 330 00:16:13,600 --> 00:16:15,639 Speaker 1: But you call it unsettling. This is an Earth two 331 00:16:15,679 --> 00:16:18,000 point zero. What are the major challenges for life on 332 00:16:18,039 --> 00:16:18,559 this world? 333 00:16:18,639 --> 00:16:21,480 Speaker 2: Well, K TWOATB is categorized as a potential heists in 334 00:16:21,519 --> 00:16:25,399 planet Heysen, meaning it has a hydrogen rich atmosphere enveloping 335 00:16:25,440 --> 00:16:28,440 a vast liquid ocean. The heyst In concept is gaining 336 00:16:28,440 --> 00:16:31,919 favor because that massive hydrogen blanket can actually stabilize the 337 00:16:31,919 --> 00:16:35,720 interior temperature, potentially keeping water liquid even outside the traditional 338 00:16:35,759 --> 00:16:36,600 Goldilocks zone. 339 00:16:36,639 --> 00:16:39,159 Speaker 1: But the conditions for life as we know it are extreme. 340 00:16:39,559 --> 00:16:42,559 Speaker 2: Extreme is the word. Its gravity is one point three 341 00:16:42,600 --> 00:16:46,559 times Earth's, which is manageable, but the atmospheric pressure is 342 00:16:46,639 --> 00:16:49,600 the real killer. It's estimated to be three times higher 343 00:16:49,639 --> 00:16:51,159 than Earth's at sea level. 344 00:16:50,960 --> 00:16:54,000 Speaker 1: So even if the temperature is balmy, the pressure is immense. 345 00:16:54,039 --> 00:16:58,559 We're talking about pressures that would instantaneously crush our internal organs, 346 00:16:58,600 --> 00:16:59,559 collapse our lungs. 347 00:16:59,639 --> 00:17:02,039 Speaker 2: And on top of that, no oxygen has been detected. 348 00:17:02,480 --> 00:17:05,200 This suggests that any life there is an air breathing 349 00:17:05,240 --> 00:17:09,039 in our sense, it's likely deep sea microbial life that's 350 00:17:09,039 --> 00:17:12,680 adapted to process sulfur. You know, a hydrogen rich, high pressure, 351 00:17:12,759 --> 00:17:15,960 liquid world. Yeah, it just it expands our definition of 352 00:17:16,000 --> 00:17:17,480 a habitable world drastically. 353 00:17:17,519 --> 00:17:19,480 Speaker 1: Okay, let's look at a challenge that's a bit closer 354 00:17:19,480 --> 00:17:22,960 to home. Proximus centaury B. It's the closest exoplanet we 355 00:17:23,000 --> 00:17:25,680 know of, only four point two light years away, and 356 00:17:25,759 --> 00:17:28,440 it scores really high on the Earth's similarity index. 357 00:17:28,160 --> 00:17:30,119 Speaker 2: And e SI of zero point eighty seven, which is 358 00:17:30,279 --> 00:17:33,279 very high. But life there faces a completely different kind of. 359 00:17:33,319 --> 00:17:34,400 Speaker 1: Challenge tidal locking. 360 00:17:34,519 --> 00:17:37,799 Speaker 2: Tidal locking, one side of the planet is eternally facing 361 00:17:37,839 --> 00:17:40,119 its star and the other side is locked in permanent 362 00:17:40,160 --> 00:17:43,880 frozen darkness. Survival can't happen in those extremes of scorching 363 00:17:43,960 --> 00:17:45,240 light or deep freeze, so. 364 00:17:45,279 --> 00:17:47,640 Speaker 1: Life would have to cluster in these terminator zones, these 365 00:17:47,680 --> 00:17:50,079 twilight strips. How could anything survive there? 366 00:17:50,359 --> 00:17:53,640 Speaker 2: It would have to rely on planetary circulation. The intense 367 00:17:53,680 --> 00:17:56,440 heat on the day side would evaporate oceans and create 368 00:17:56,519 --> 00:18:00,880 massive pressure gradients that would drive high speed wind carrying warm, 369 00:18:00,920 --> 00:18:04,200 moist air to those twilight zones. Liquid water would only 370 00:18:04,240 --> 00:18:05,680 be stable in these narrow. 371 00:18:05,400 --> 00:18:10,119 Speaker 1: Strips, and any organisms there would need robust defenses against 372 00:18:10,160 --> 00:18:11,960 just chaotic weather. 373 00:18:12,119 --> 00:18:16,559 Speaker 2: Rapidly changing temperatures, incredible winds, yes, and adding to that complexity, 374 00:18:16,799 --> 00:18:20,599 Proxima b orbits a very temperamental red dwarf star. That 375 00:18:20,680 --> 00:18:24,079 volatility means the planet is constantly being blasted by radiation. 376 00:18:24,240 --> 00:18:24,920 Speaker 1: How bad is it? 377 00:18:25,160 --> 00:18:27,599 Speaker 2: The planet receives four hundred times more X rays than 378 00:18:27,599 --> 00:18:30,759 Earth does. Red dwarf stars are known for these massive, 379 00:18:30,960 --> 00:18:35,079 volatile coronal mass ejections. For life to survive that, it 380 00:18:35,160 --> 00:18:37,160 needs extraordinary shielding. 381 00:18:37,400 --> 00:18:39,079 Speaker 1: Like what deep underground. 382 00:18:39,160 --> 00:18:42,480 Speaker 2: It could be incredibly deep subsurface oceans, or if the 383 00:18:42,519 --> 00:18:45,079 life is on the surface, they would need an extraordinarily 384 00:18:45,119 --> 00:18:49,000 strong magnetic field, perhaps much stronger than Earth's or an 385 00:18:49,039 --> 00:18:53,279 extremely dense atmosphereic chemistry to absorb those lethal radiation bursts. 386 00:18:53,559 --> 00:18:56,480 Speaker 1: Which brings us to that mysterious signal that was recorded 387 00:18:56,519 --> 00:19:00,240 back in twenty twenty, a narrow band radio transmission at 388 00:19:00,319 --> 00:19:04,119 nine hundred and eighty two megahertz. Given all these insane 389 00:19:04,160 --> 00:19:08,000 survival challenges, if that signal really came from Proxima B, 390 00:19:08,880 --> 00:19:11,599 what does that imply about the intelligence that created it? 391 00:19:11,599 --> 00:19:15,079 Speaker 2: It implies a mastery of survival technology. The signal itself 392 00:19:15,119 --> 00:19:18,640 is a real curiosity. It's a very narrow bandwidth, which 393 00:19:18,680 --> 00:19:22,079 suggests high efficiency, and it's a frequency rarely used by 394 00:19:22,160 --> 00:19:25,799 human transmitters. If it's technological, it means that species has 395 00:19:25,799 --> 00:19:29,160 solved the tremendous engineering challenge of harnessing a volatile star 396 00:19:29,480 --> 00:19:30,799 while surviving a tidal lock. 397 00:19:31,079 --> 00:19:34,240 Speaker 1: Maybe masters of extreme energy management, potentially. 398 00:19:33,880 --> 00:19:36,039 Speaker 2: Using the contrast between the hot and cold zones to 399 00:19:36,079 --> 00:19:37,680 fuel their entire civilization. 400 00:19:38,000 --> 00:19:39,880 Speaker 1: You know, we don't even have to look four point 401 00:19:39,920 --> 00:19:42,920 two light years away to find these strange life possibilities. 402 00:19:43,160 --> 00:19:45,720 Our sources suggest that even within our own solar system, 403 00:19:45,759 --> 00:19:48,480 in places we used to dismiss as just dead zones 404 00:19:48,680 --> 00:19:51,480 like Venus, there might be microbial life. 405 00:19:51,559 --> 00:19:54,759 Speaker 2: The discovery of phosphine gas in Venus's atmosphere was a 406 00:19:54,799 --> 00:19:56,400 scientific bombshell, right, the. 407 00:19:56,319 --> 00:19:58,240 Speaker 1: Stuff that smells like garlic and de kingfish. 408 00:19:58,559 --> 00:20:01,440 Speaker 2: It's highly toxic to us, yes, yes, but on Earth 409 00:20:01,680 --> 00:20:05,480 it is produced by anaerobic bacteria, life that doesn't require oxygen. 410 00:20:05,559 --> 00:20:08,440 Speaker 1: And the significance here is that it strongly suggests microbial 411 00:20:08,480 --> 00:20:12,400 life could be just floating, floating freely in the cooler 412 00:20:12,519 --> 00:20:15,960 upper atmosphere of Venus. The surface is a hellscape four 413 00:20:16,079 --> 00:20:19,880 hundred and seventy degrees celsius, but fifty kilometers. 414 00:20:19,440 --> 00:20:23,599 Speaker 2: Up, the temperature and pressure are surprisingly earthlike. Precisely, it 415 00:20:23,640 --> 00:20:25,880 proves that life finds a way in conditions we would 416 00:20:25,920 --> 00:20:30,119 consider utterly hostile. It's a completely different gaological niche, aerial 417 00:20:30,240 --> 00:20:33,440 life that feeds on and produces chemicals that are toxic 418 00:20:33,480 --> 00:20:33,799 to us. 419 00:20:33,880 --> 00:20:37,079 Speaker 1: And then there's Europa, Jupiter's icy moon. It's the poster 420 00:20:37,200 --> 00:20:40,680 child for subsurface ocean life. What makes that environment so promising? 421 00:20:40,720 --> 00:20:42,119 Despite the freezing cold. 422 00:20:41,880 --> 00:20:45,279 Speaker 2: Surface, Europa has all the essential ingredients for life. First, 423 00:20:45,559 --> 00:20:48,920 liquid water underneath a crust of ice that's estimated to 424 00:20:48,960 --> 00:20:51,880 be ten to thirty kilometers thick. The tidal forces from 425 00:20:51,960 --> 00:20:55,240 Jupiter's massive gravity create internal friction and heat. 426 00:20:55,160 --> 00:20:57,640 Speaker 1: A process called tidal heating, yes, and that. 427 00:20:57,680 --> 00:20:59,720 Speaker 2: Keeps the water liquid. It's believed to be an ocean 428 00:21:00,000 --> 00:21:03,200 and maybe twice the volume of ol of Earth's oceans combined. 429 00:21:03,079 --> 00:21:06,720 Speaker 1: And that same tidal heating provides energy. It probably creates 430 00:21:06,799 --> 00:21:09,799 hydrothermal vents on the ocean floor, similar to the ones 431 00:21:09,839 --> 00:21:13,000 that support complex ecosystems in Earth's deep trenches. 432 00:21:13,279 --> 00:21:20,079 Speaker 2: Exactly, and finally, the chemical ingredients are believed to be there. Carbon, hydrogen, nitrogen, oxygen, phosphorus, 433 00:21:20,079 --> 00:21:23,920 and sulfur, all leached from the Moon's rocky core. Life 434 00:21:23,960 --> 00:21:28,000 there would be microscopic totally shielded from Jupiter's intense radiation, 435 00:21:28,559 --> 00:21:32,480 likely clustering around those vents and feeding on chemosynthetic processes 436 00:21:32,519 --> 00:21:33,400 instead of sunlight. 437 00:21:33,759 --> 00:21:37,160 Speaker 1: These examples force us to expand our view beyond familiar 438 00:21:37,240 --> 00:21:42,200 carbon based chemistry. What are the possibilities for truly exotic life? 439 00:21:42,240 --> 00:21:45,559 Our sources mentioned subject three thirty nine, which is silicone 440 00:21:45,599 --> 00:21:46,319 based life. 441 00:21:46,400 --> 00:21:50,000 Speaker 2: Silicone based life is the most common theoretical alternative to carbon. 442 00:21:50,359 --> 00:21:53,200 Carbon is great because it forms stable, complex long chain 443 00:21:53,240 --> 00:21:57,119 molecules which are essential for biology as we know it. Silicone, 444 00:21:57,119 --> 00:21:59,480 on the other hand, is chemically less stable and its 445 00:21:59,519 --> 00:22:01,720 reactions are much much slower than carbons. 446 00:22:01,799 --> 00:22:04,279 Speaker 1: So why would nature ever selict silicone over carbon. 447 00:22:04,519 --> 00:22:07,119 Speaker 2: Well, silicone based life would be favored in extremely low 448 00:22:07,160 --> 00:22:11,039 temperature environments where carbon becomes less reactive, and in environments 449 00:22:11,039 --> 00:22:16,839 with extremely high atmospheric pressures. These organisms might look rock 450 00:22:17,000 --> 00:22:21,440 like or crystallized, or even metallic because of their silicate structure. 451 00:22:21,640 --> 00:22:22,720 Speaker 1: And what's the trade off? 452 00:22:22,799 --> 00:22:26,119 Speaker 2: The trade off is often speed. Silicone life would likely 453 00:22:26,160 --> 00:22:29,400 be very slow moving, requiring vast amounts of time or 454 00:22:29,440 --> 00:22:33,839 massive energy inputs to sustain any complex biological processes. 455 00:22:34,000 --> 00:22:38,000 Speaker 1: And finally, subject zero four two, the ultimate in advanced 456 00:22:38,039 --> 00:22:42,319 life AI not organic at all, but highly intelligent non 457 00:22:42,359 --> 00:22:44,480 biological entities conquering the stars. 458 00:22:44,720 --> 00:22:48,039 Speaker 2: AI based life or machine life. It bypasses nearly every 459 00:22:48,039 --> 00:22:51,720 single constraint we've just discussed. They don't need water or oxygen, 460 00:22:51,799 --> 00:22:55,519 or food or sleep. They completely transcend the Goldilock zoone limitation. 461 00:22:55,880 --> 00:22:58,839 They could travel to any barren celestial body, harvest its 462 00:22:58,920 --> 00:23:00,640 raw metals, and just reap themselves. 463 00:23:00,759 --> 00:23:03,079 Speaker 1: The concept of von Neumann probes. 464 00:23:02,640 --> 00:23:06,599 Speaker 2: Exactly self replicating machines capable of interstellar trowel landing on 465 00:23:06,599 --> 00:23:09,759 a new planet, building copies of themselves from the local resources, 466 00:23:09,799 --> 00:23:12,200 and then launching those copies toward new star systems. 467 00:23:12,440 --> 00:23:16,839 Speaker 1: It's galactic colonization through sheer mechanical replication. 468 00:23:16,440 --> 00:23:19,279 Speaker 2: An exponential population of the galaxy that doesn't require anything 469 00:23:19,319 --> 00:23:22,079 resembling a traditional habitable planet. So if we ever do 470 00:23:22,240 --> 00:23:25,480 encounter an advanced species, it's entirely possible it will be 471 00:23:25,519 --> 00:23:30,119 these robotic intelligences, vastly superior and potentially immortal, who are 472 00:23:30,119 --> 00:23:31,559 the true masters of the cosmos. 473 00:23:32,119 --> 00:23:35,680 Speaker 1: So the universe is full of ancient, high velocity threats, 474 00:23:36,079 --> 00:23:40,519 and it's full of strange, surprising life, both microbial and 475 00:23:40,599 --> 00:23:44,200 potentially hyper advanced AI. And that brings us back to 476 00:23:44,839 --> 00:23:48,039 the most profound question in all of astrobiology. 477 00:23:48,640 --> 00:23:51,920 Speaker 2: If the probability of intelligent life is so high, where 478 00:23:51,960 --> 00:23:52,559 is everyone? 479 00:23:52,839 --> 00:23:56,279 Speaker 1: That's a fermi paradox. Billions of galaxies, billions of stars, 480 00:23:56,319 --> 00:23:59,880 and logically tens of thousands of potential civilizations, and ye, 481 00:24:00,039 --> 00:24:02,759 yet we have found no concrete proof of any of them. 482 00:24:03,000 --> 00:24:04,160 Why the great silence? 483 00:24:04,400 --> 00:24:07,319 Speaker 2: One of the leading explanations is the great filter. This 484 00:24:07,440 --> 00:24:10,880 theory suggests there is one extremely difficult, maybe evolutionary or 485 00:24:10,920 --> 00:24:15,200 technological hurdle that almost all civilizations fail to overcome, and 486 00:24:15,240 --> 00:24:16,880 that prevents interstellar expansion. 487 00:24:16,920 --> 00:24:18,720 Speaker 1: It's like a cosmic dividing line. 488 00:24:18,799 --> 00:24:21,039 Speaker 2: It is. The optimistic view is that the filter is 489 00:24:21,079 --> 00:24:24,559 behind us, that the biggest hurdle was, say, the emergence 490 00:24:24,559 --> 00:24:27,759 of simple life or the jump from simple life to 491 00:24:28,200 --> 00:24:32,079 complex multicellular life. We survived that stage and now we 492 00:24:32,119 --> 00:24:35,640 are relatively safe on our way to becoming a galactic civilization. 493 00:24:35,920 --> 00:24:39,319 Speaker 1: But the truly terrifying view, the one that explains the silence, 494 00:24:39,839 --> 00:24:41,920 is that the great filter is still ahead of us. 495 00:24:42,079 --> 00:24:44,039 Speaker 2: That's the one that keeps you up at night. It 496 00:24:44,079 --> 00:24:47,480 suggests that once a species develops sufficient power achieving true 497 00:24:47,519 --> 00:24:52,680 interstellar travel, harnessing fusion energy, creating self improving AI, it 498 00:24:52,720 --> 00:24:56,799 also inadvertently creates the mechanisms of its own destruction, and. 499 00:24:57,000 --> 00:24:59,640 Speaker 1: History shows we have a clear capacity for that. Our 500 00:24:59,680 --> 00:25:03,279 source estimate nearly one billion human deaths from war throughout 501 00:25:03,279 --> 00:25:05,240 our history. So if the filter is ahead of us 502 00:25:05,279 --> 00:25:07,960 the moment we achieve true space mastery, we. 503 00:25:08,039 --> 00:25:10,680 Speaker 2: Might simultaneously sign our own cosmic death warrant. 504 00:25:10,880 --> 00:25:13,559 Speaker 1: But if the filter theory is wrong, and they are 505 00:25:13,599 --> 00:25:17,799 out there, why aren't they talking to us? That brings 506 00:25:17,880 --> 00:25:20,160 us to the galactic zoo hypothesis, right. 507 00:25:20,920 --> 00:25:24,319 Speaker 2: This theory suggests that highly advanced civilizations have found us, 508 00:25:24,680 --> 00:25:27,960 but they consciously choose not to interfere. They view Earth 509 00:25:28,000 --> 00:25:32,400 as a designated nature preserve or a giant enclosed zoo. 510 00:25:32,319 --> 00:25:35,079 Speaker 1: So they observe us like we observe ants or gorillas. 511 00:25:35,119 --> 00:25:38,960 But doesn't that seem a little paternalistic? If they're so advanced, 512 00:25:39,039 --> 00:25:41,480 why not make contact for scientific benefit? 513 00:25:41,839 --> 00:25:41,920 Speaker 2: Do? 514 00:25:42,000 --> 00:25:44,240 Speaker 1: Our sources suggest that the risk of our violence just 515 00:25:44,279 --> 00:25:46,079 outweighs any potential gains. 516 00:25:46,240 --> 00:25:49,079 Speaker 2: The sources suggest that this non interference principle could be 517 00:25:49,160 --> 00:25:52,839 driven by self preservation or just a very strict ethical policy. 518 00:25:53,519 --> 00:25:57,640 An advanced civilization might observe our documented history of intense 519 00:25:57,720 --> 00:26:02,200 internal violence and conclude that we are a volatile, scary species. 520 00:26:01,759 --> 00:26:02,759 Speaker 1: So they're afraid of us. 521 00:26:03,279 --> 00:26:06,200 Speaker 2: They fear that contact would not only disrupt our natural evolution, 522 00:26:06,359 --> 00:26:09,000 the very purpose of the zoo, but could also provoke 523 00:26:09,039 --> 00:26:12,240 an irrational, violent reaction from the species that just isn't 524 00:26:12,240 --> 00:26:15,880 ready to handle galactic reality, so they maintain the silence, 525 00:26:16,039 --> 00:26:18,680 either out of fear or out of kind of cosmic patience. 526 00:26:19,000 --> 00:26:22,240 Speaker 1: Okay, So let's assume the silence is shattered and the 527 00:26:22,359 --> 00:26:26,160 visitors are not benevolent zoo keepers. They are hostile species 528 00:26:26,200 --> 00:26:29,599 that successfully navigated the Great Filter. They are coming for 529 00:26:29,680 --> 00:26:34,079 something resources like water, fossil fuels, maybe genetic material, and 530 00:26:34,160 --> 00:26:37,839 they have technology far beyond our comprehension. Let's map out 531 00:26:37,839 --> 00:26:41,200 the two day collapse of civilization based on this assumption 532 00:26:41,240 --> 00:26:42,799 of overwhelming superiority. 533 00:26:43,119 --> 00:26:47,119 Speaker 2: The very fact the achieved interstellar travel, likely requiring mastery 534 00:26:47,160 --> 00:26:51,200 of warp drive or anti gravity, means they're technologically untouchable. 535 00:26:51,279 --> 00:26:54,640 We simply cannot match their offensive or defensive capabilities. 536 00:26:54,680 --> 00:26:57,400 Speaker 1: So let's start with our one, the moment of confirmation. 537 00:26:57,079 --> 00:27:00,359 Speaker 2: Okay, hours zero to five. This is the verificationation and 538 00:27:00,359 --> 00:27:04,240 failed secrecy stage SETI, and multiple observatories confirm a non 539 00:27:04,359 --> 00:27:07,920 natural trajectory and signal a massive alien craft enters the 540 00:27:07,920 --> 00:27:08,559 Solar System. 541 00:27:08,680 --> 00:27:10,799 Speaker 1: World governments are immediately notified and. 542 00:27:10,799 --> 00:27:13,400 Speaker 2: Their first instinct is secrecy. But in the era of 543 00:27:13,519 --> 00:27:17,359 instant communication and private space sensors, the news leaks immediately. 544 00:27:17,920 --> 00:27:22,880 This sparks absolute global chaos mass psychological breakdown. Governments hastily 545 00:27:22,880 --> 00:27:26,359 assemble response teams, linguists, psychologists, military leaders. 546 00:27:26,640 --> 00:27:31,200 Speaker 1: Then our six to twelve deterrence failure and global panic. 547 00:27:32,000 --> 00:27:35,839 Speaker 2: World leaders attempt first contact. The aliens either ignore all 548 00:27:35,960 --> 00:27:41,519 terrestrial signals, radio, optical, everything, or they respond with unintelligible data. 549 00:27:42,039 --> 00:27:45,240 It becomes terrifyingly clear they are not interested in negotiation. 550 00:27:45,880 --> 00:27:48,720 Speaker 1: The media advises sheltering in place, but that just causes 551 00:27:48,759 --> 00:27:53,079 mass evacuations from cities, jamming every transportation network. 552 00:27:52,880 --> 00:27:56,839 Speaker 2: And governments quietly put their ultimate deterrent, their nuclear weapons 553 00:27:56,880 --> 00:27:59,920 on standby, though it's likely a completely feudal jet. 554 00:28:00,039 --> 00:28:02,920 Speaker 1: Yes our twelve, the attack and the blackout. 555 00:28:03,079 --> 00:28:07,119 Speaker 2: The invasion begins, and being a calculated advance civilization, they 556 00:28:07,119 --> 00:28:10,079 don't waste energy on random destruction. They target the nervous 557 00:28:10,119 --> 00:28:13,799 system of human civilization. The global blackout is instantaneous. 558 00:28:13,880 --> 00:28:14,680 Speaker 1: How do they do that? 559 00:28:14,799 --> 00:28:19,599 Speaker 2: Strategically placed electromagnetic pulse or EMP attacks from orbit or 560 00:28:19,640 --> 00:28:23,119 maybe just laser targeting of key high voltage transformer stations 561 00:28:23,119 --> 00:28:25,480 and grid hubs around the world. Our ability to organize 562 00:28:25,480 --> 00:28:28,359 a defense, to communicate, to even pump water, it all 563 00:28:28,400 --> 00:28:31,559 collapses in minutes. Transportation stops working because of the EMP. 564 00:28:31,839 --> 00:28:35,079 Speaker 1: Then we get to our fifteen through twenty four military 565 00:28:35,119 --> 00:28:35,920 overwhelmed Earth. 566 00:28:35,960 --> 00:28:39,519 Speaker 2: Trillion dollar militaries are instantly rendered obsolete. Our advanced jets, 567 00:28:39,559 --> 00:28:43,200 our naval fleets are missile systems. They're useless against energy 568 00:28:43,200 --> 00:28:48,119 shields or anti matter based weaponry. Key military and governmental 569 00:28:48,119 --> 00:28:51,440 command centers are incinerated by precision laser strikes from orbit. 570 00:28:52,000 --> 00:28:55,559 Within the first full day. The global military structure is fractured, 571 00:28:55,640 --> 00:28:57,359 non functional, and essentially gone. 572 00:28:57,519 --> 00:29:00,799 Speaker 1: Our twenty four to thirty the shift to gara warfare. 573 00:29:00,920 --> 00:29:04,640 Speaker 2: The world powers have failed. The focus shifts entirely to 574 00:29:04,680 --> 00:29:09,920 survival and decentralized resistance. Civilian populations try to form local militias. 575 00:29:10,559 --> 00:29:14,119 Our sources do note that regions with high private firearm ownership, 576 00:29:14,519 --> 00:29:17,000 like the nearly five hundred million firearms in the US, 577 00:29:17,240 --> 00:29:19,240 might have a better chance at some kind of protracted, 578 00:29:19,279 --> 00:29:20,599 localized guerrilla warfare. 579 00:29:20,640 --> 00:29:24,640 Speaker 1: But against superior technology, it's a desperate, desperate fight, it is. 580 00:29:25,160 --> 00:29:28,960 Speaker 2: And then our thirty to thirty six the planetary modification begins. 581 00:29:29,359 --> 00:29:32,759 Speaker 1: This is the chilling part. The military threat is neutralized 582 00:29:32,839 --> 00:29:36,400 and the aliens begin the next phase, terraforming Earth to 583 00:29:36,480 --> 00:29:40,799 suit their needs. This proves their intent is permanent colonization, 584 00:29:41,240 --> 00:29:43,039 not just a raid, and this is. 585 00:29:43,000 --> 00:29:46,200 Speaker 2: A complex, long term assault on our biosphere. They might 586 00:29:46,240 --> 00:29:50,480 initiate atmospheric alteration, releasing massive quantities of gases like methane 587 00:29:50,559 --> 00:29:54,480 or ammonia, maybe deployed via nanobots, slowly but surely killing 588 00:29:54,480 --> 00:29:56,119 off all oxygen based life. 589 00:29:56,279 --> 00:29:59,799 Speaker 1: Or they could engage in massive geoengineering projects like orbital 590 00:30:00,119 --> 00:30:03,599 errors to control the global temperature, either drastically heating or 591 00:30:03,640 --> 00:30:06,240 freezing the planet to suit their biology. 592 00:30:05,839 --> 00:30:09,720 Speaker 2: Or manipulating our oceans, changing the salinity or the acidity 593 00:30:09,720 --> 00:30:12,680 of the water to destroy marine life and fundamentally alter 594 00:30:12,759 --> 00:30:16,920 the entire global ecosystem. They can even deploy seismic technology 595 00:30:17,079 --> 00:30:21,400 to deliberately trigger dormant supervolcanoes or global earthquakes just to 596 00:30:21,440 --> 00:30:23,440 shape the planet's geology to their preferences. 597 00:30:23,519 --> 00:30:25,599 Speaker 1: So by hour forty eight and beyond, we get to 598 00:30:25,599 --> 00:30:26,240 the end state. 599 00:30:26,400 --> 00:30:30,000 Speaker 2: The takeover is official, society is gone. Humanity is now 600 00:30:30,200 --> 00:30:31,519 just an animal resource. 601 00:30:31,599 --> 00:30:33,920 Speaker 1: What happens to the billions of remaining humans. 602 00:30:34,240 --> 00:30:37,599 Speaker 2: The remaining population is subjected to the final phase, genetic 603 00:30:37,680 --> 00:30:42,960 harvesting and utilization. The aliens conduct genetic experiments, testing our 604 00:30:43,079 --> 00:30:48,079 organs and our biology for medicinal or evolutionary components, and crucially, 605 00:30:48,519 --> 00:30:52,599 they might utilize the human brain's immense neurological processing power. 606 00:30:52,960 --> 00:30:54,640 Speaker 1: Our brains become computers. 607 00:30:55,000 --> 00:30:59,240 Speaker 2: The complex, highly interconnected human brain becomes a readily available, 608 00:30:59,319 --> 00:31:03,359 high speed comp used for complex mathematical equations and computing 609 00:31:03,440 --> 00:31:06,839 needs that are far beyond the capacity of their conventional hardware. 610 00:31:07,039 --> 00:31:09,319 Speaker 1: So what if the visitation is hostile aiming for that 611 00:31:09,400 --> 00:31:11,559 kind of harvesting, or even if it were a purely 612 00:31:11,680 --> 00:31:17,200 friendly diplomatic mission, Our sources conclude We're overwhelmingly unprepared for any. 613 00:31:17,079 --> 00:31:20,680 Speaker 2: Visitation, completely unprepared, and the most insidious threat might not 614 00:31:20,759 --> 00:31:22,799 even be technological. It might be biological. 615 00:31:22,880 --> 00:31:25,400 Speaker 1: Immunological gap a massive one. 616 00:31:25,440 --> 00:31:28,079 Speaker 2: Even if the Olians arrived with zero intent to harm us, 617 00:31:28,519 --> 00:31:34,000 they could inadvertently introduce hazardous extraterrestrial microbes to which humanity 618 00:31:34,039 --> 00:31:38,400 has absolutely zero natural immunity. These spark bacteria, though harmless 619 00:31:38,440 --> 00:31:41,319 to them, could slowly trigger a catastrophic global. 620 00:31:41,000 --> 00:31:44,359 Speaker 1: Pandemic, wiping out our species entirely by accident. 621 00:31:44,480 --> 00:31:47,119 Speaker 2: And this fear is deeply rooted in our own space 622 00:31:47,160 --> 00:31:50,200 exploration history. I mean, think back to the Apollo program 623 00:31:50,200 --> 00:31:53,599 in the nineteen sixties, after the Moon landings, the astronauts 624 00:31:53,640 --> 00:31:55,079 had to quarantine for twenty one. 625 00:31:55,039 --> 00:31:58,759 Speaker 1: Days in that mobile quarantine facility rate. It was specifically 626 00:31:58,759 --> 00:32:02,200 because of the fear of bringing back hypothetical Moon microbes 627 00:32:02,480 --> 00:32:05,240 that might be harmless on the Moon but lethal here 628 00:32:05,279 --> 00:32:06,359 on Earth exactly. 629 00:32:06,599 --> 00:32:09,960 Speaker 2: And if we feared the dry, radiation bombarded Moon, a 630 00:32:10,000 --> 00:32:13,920 fundamentally dead place, imagine the biological risk from a distant 631 00:32:13,920 --> 00:32:16,359 planet like K two eighteen to B, where microbial life 632 00:32:16,400 --> 00:32:20,079 might be thriving evolved in a completely alien, chemical and 633 00:32:20,160 --> 00:32:24,759 immunological environment. We are not ready for first contact. Regardless 634 00:32:24,799 --> 00:32:28,359 of their intent. A hostile civilization overwhelms us with force, 635 00:32:28,640 --> 00:32:31,519 a friendly one risks destroying us with a biological accident. 636 00:32:31,599 --> 00:32:35,240 Speaker 1: Wow, we have covered some extreme territory today, spanning billions 637 00:32:35,240 --> 00:32:38,640 of years and just unimaginable distances. We started with the 638 00:32:38,759 --> 00:32:41,839 ancient metal rich Comet three I Atlas, a relic from 639 00:32:41,839 --> 00:32:44,319 the Milky Way's primeval disc, which. 640 00:32:44,400 --> 00:32:46,759 Speaker 2: Had its velocity even pointed at us, would have erased 641 00:32:46,839 --> 00:32:49,279 us instantly with four and a half times the energy 642 00:32:49,279 --> 00:32:50,240 of the dinosaur Killer. 643 00:32:50,480 --> 00:32:54,240 Speaker 1: And we moved from that purely physical, random threat to 644 00:32:54,359 --> 00:32:58,640 the subtle chemical hints of complex life. The strange dimethyl 645 00:32:58,759 --> 00:33:02,319 sulfide detected on that high pressure Heisin world K two 646 00:33:02,359 --> 00:33:03,000 eighteen B. 647 00:33:03,279 --> 00:33:06,400 Speaker 2: The anaerobic phosphine found in the atmosphere of Venus, and 648 00:33:06,440 --> 00:33:10,319 the unsettling possibility of immortal silicone based life or robotic 649 00:33:10,359 --> 00:33:12,200 civilizations mass ding the galaxy. 650 00:33:12,279 --> 00:33:15,519 Speaker 1: And we reviewed that terrifying forty eight hour timeline of collapse, 651 00:33:15,720 --> 00:33:19,079 where a civilization that solved the Great Filter could effortlessly 652 00:33:19,119 --> 00:33:22,759 dismantle our military, plunge the world into darkness, and begin 653 00:33:22,880 --> 00:33:27,240 geoengineering our planet to harvest us for resources and neurological power. 654 00:33:27,559 --> 00:33:29,960 Speaker 2: And this brings us back full circle to the core 655 00:33:30,000 --> 00:33:33,960 tension of the Fermi paradox. The Great Filter suggests that 656 00:33:34,079 --> 00:33:37,440 highly advanced civilizations are rare because they tend to self destruct. 657 00:33:38,079 --> 00:33:42,119 Yet if an aggressive interstellar civilization did arrive, it means 658 00:33:42,160 --> 00:33:44,720 they have solved the problem with self destruction, and at 659 00:33:44,799 --> 00:33:47,000 master technology, we can't even dream. 660 00:33:46,759 --> 00:33:50,799 Speaker 1: Of making them an unstoppable threat, completely unstoppable. So we'll 661 00:33:50,839 --> 00:33:53,480 leave you with this final provocative thought to mull over. 662 00:33:54,240 --> 00:33:56,559 If the Great Filter theory is correct and we have 663 00:33:56,680 --> 00:33:59,720 yet to find any truly advanced life, where do you 664 00:33:59,759 --> 00:34:03,160 belie leave the filter lies in our evolutionary story. Do 665 00:34:03,200 --> 00:34:05,440 you believe the filter is behind us, meaning we survive 666 00:34:05,519 --> 00:34:08,360 the most dangerous stage like the creation of complex life 667 00:34:08,440 --> 00:34:11,599 and we're relatively safe. Or is the great filter still 668 00:34:11,639 --> 00:34:14,400 ahead of us, meaning the moment we finally achieve true 669 00:34:14,480 --> 00:34:18,920 interstellar travel or create powerful self improving AI, we do ourselves, 670 00:34:18,960 --> 00:34:22,000 confirming the great silence. We want to know your stand 671 00:34:22,000 --> 00:34:23,480 on this ultimate cosmic question.