1 00:00:00,120 --> 00:00:04,280 Speaker 1: Imagine you found an ancient recipe book, not just you know, 2 00:00:04,400 --> 00:00:07,000 a few centuries old, but a book written in a 3 00:00:07,080 --> 00:00:11,400 language older than time itself, and it details the literal 4 00:00:11,599 --> 00:00:17,039 ingredients that went into creating well everything, including us. 5 00:00:17,239 --> 00:00:19,079 Speaker 2: That's a powerful thought because. 6 00:00:18,760 --> 00:00:22,120 Speaker 1: That is fundamentally what scientists are doing right now. They're 7 00:00:22,160 --> 00:00:28,359 reading these profound secrets trapped inside space rocks, asteroids. 8 00:00:27,879 --> 00:00:31,079 Speaker 2: And the things they're finding are just their game change. 9 00:00:31,120 --> 00:00:34,119 Speaker 1: Absolutely, we're talking about discoveries that suggest life might be 10 00:00:34,200 --> 00:00:36,079 incredibly common throughout the universe. 11 00:00:36,359 --> 00:00:38,399 Speaker 2: And this is the other side of the coin. They're 12 00:00:38,439 --> 00:00:43,000 also this stark, perpetual reminder that our entire existence is, 13 00:00:43,320 --> 00:00:47,000 you know, always one tiny cosmic nudge away from catastrophe. 14 00:00:47,119 --> 00:00:49,560 Speaker 1: That's the ultimate cosmic pimodox it is. 15 00:00:49,640 --> 00:00:51,920 Speaker 2: And our mission today is to really unpack that. We've 16 00:00:51,960 --> 00:00:55,679 got a massive stack of sources detailing these recent stunning findings. 17 00:00:55,759 --> 00:00:58,280 Speaker 1: Right we're doing a deep dive into the actual physical 18 00:00:58,320 --> 00:00:59,280 samples returned to. 19 00:00:59,240 --> 00:01:03,399 Speaker 2: Earth, like Japan's Hyabusa two, which went to asteroid for Yugu, 20 00:01:03,679 --> 00:01:06,680 and of course NASA's Osiris rex, which brought back that 21 00:01:06,840 --> 00:01:09,000 pristine material from asteroid Binu. 22 00:01:09,480 --> 00:01:12,319 Speaker 1: And we're pairing those miraculous findings with the latest and 23 00:01:12,359 --> 00:01:15,680 I have to say often terrifying tracking data on near 24 00:01:15,760 --> 00:01:17,319 Earth objects. 25 00:01:17,040 --> 00:01:21,359 Speaker 2: The NEOs, and specifically the ones they classify as potentially 26 00:01:21,439 --> 00:01:24,079 hazardous asteroids or PHAs. 27 00:01:24,400 --> 00:01:26,439 Speaker 1: So we're going to try and understand the two faces 28 00:01:26,480 --> 00:01:30,439 of asteroids, first as the potential source of the very foundation. 29 00:01:30,079 --> 00:01:32,480 Speaker 2: Of life on Earth, the cosmic factory that made. 30 00:01:32,359 --> 00:01:35,959 Speaker 1: Us, and second as the civilization level hazards that threatened 31 00:01:36,040 --> 00:01:38,040 to well undo all of it in a flash. 32 00:01:38,159 --> 00:01:41,239 Speaker 2: We're really going from the microscopic ingredients of life to 33 00:01:41,319 --> 00:01:43,439 the astronomical scale of destruction. 34 00:01:43,599 --> 00:01:46,719 Speaker 1: Prepare for some genuine aha moments, the kind where you 35 00:01:46,760 --> 00:01:48,920 realize just how complex your own history. 36 00:01:48,640 --> 00:01:51,319 Speaker 2: Is, followed immediately by moments that make you look up 37 00:01:51,319 --> 00:01:56,079 at the night sky and genuinely wonder what gigantic, invisible 38 00:01:56,159 --> 00:01:58,760 rock is flying past us right now, and just how 39 00:01:58,799 --> 00:01:59,359 close is it. 40 00:02:00,200 --> 00:02:03,079 Speaker 1: Let's unpack this incredible story of cosmic creation. I want 41 00:02:03,079 --> 00:02:05,079 to start with the samples from Reugu. 42 00:02:04,719 --> 00:02:07,959 Speaker 2: The Hyabusatwu mission returned in twenty twenty two. 43 00:02:08,240 --> 00:02:11,000 Speaker 1: When scientists opened those canisters, I mean they were expecting 44 00:02:11,039 --> 00:02:14,319 inert dust, right, but what they got was evidence of 45 00:02:14,360 --> 00:02:19,639 this this chemical revolution happening constantly in deep space. 46 00:02:19,479 --> 00:02:22,479 Speaker 2: And the most compelling find the one that really changes 47 00:02:22,479 --> 00:02:24,280 the whole conversation about the origin of. 48 00:02:24,240 --> 00:02:26,759 Speaker 1: Life, the foundation of all life exactly. 49 00:02:27,039 --> 00:02:30,280 Speaker 2: And what's fascinating here is the sheer ease with which 50 00:02:30,400 --> 00:02:33,680 these components seem to form. Sentences that were just stunned 51 00:02:33,759 --> 00:02:36,199 to find multiple types of amino. 52 00:02:35,879 --> 00:02:38,199 Speaker 1: Acids, the building blocks of proteins. 53 00:02:37,719 --> 00:02:40,280 Speaker 2: Which are the bedrock of all known life. They found 54 00:02:40,319 --> 00:02:43,919 them right there inside the Reugu dust. This basically confirms 55 00:02:43,919 --> 00:02:45,639 a hypothesis biologists have held. 56 00:02:45,560 --> 00:02:48,520 Speaker 1: For decades that life's ingredients were seeded. 57 00:02:48,159 --> 00:02:49,800 Speaker 2: From space precisely. 58 00:02:49,840 --> 00:02:51,800 Speaker 1: But the shock factor wasn't just that they found them, 59 00:02:51,800 --> 00:02:54,680 because we have seen amino acids and meteorites before. 60 00:02:54,479 --> 00:02:57,639 Speaker 2: Haven't we We have, Yes, The shock was the sheer 61 00:02:57,759 --> 00:03:00,360 variety of them and the realization of how they. 62 00:03:00,159 --> 00:03:03,879 Speaker 1: Were formed naturally in space, with no biology involved, no 63 00:03:04,000 --> 00:03:05,080 planet required, just. 64 00:03:05,120 --> 00:03:08,680 Speaker 2: Raw ingredients of vacuum and cosmic radiation, sturing the pod 65 00:03:08,719 --> 00:03:09,800 for billions of years. 66 00:03:10,080 --> 00:03:14,159 Speaker 1: It fundamentally changes the implications for a biogenesis, the origin 67 00:03:14,199 --> 00:03:14,759 of life. 68 00:03:14,840 --> 00:03:18,759 Speaker 2: It does the source material really emphasizes this point. If 69 00:03:18,800 --> 00:03:22,240 amino acids are so easily made in these harsh conditions. 70 00:03:22,479 --> 00:03:23,280 They're not rare. 71 00:03:23,639 --> 00:03:25,360 Speaker 1: They could be scattered all over the universe. 72 00:03:25,560 --> 00:03:28,319 Speaker 2: But wait, if the recipe is so common, if the 73 00:03:28,319 --> 00:03:32,360 building blocks are literally everywhere, then why is life on 74 00:03:32,400 --> 00:03:35,280 Earth so unique or at least as far as we know. 75 00:03:35,719 --> 00:03:39,400 Doesn't that sort of go against the whole cosmic inevitability idea. 76 00:03:39,479 --> 00:03:44,080 Speaker 1: That's the critical difference. Asteroids provide the first step, the ingredients, So. 77 00:03:44,039 --> 00:03:48,759 Speaker 2: They're suggesting the recipe for life isn't some complex planet specific. 78 00:03:48,360 --> 00:03:51,439 Speaker 1: Miracle, right, It's more like a common chemical inevitability. But 79 00:03:51,599 --> 00:03:55,080 the step from chemistry to biology, from a. 80 00:03:55,000 --> 00:03:58,000 Speaker 2: Proto cell to a functioning, replicating. 81 00:03:57,520 --> 00:04:01,000 Speaker 1: Organism, that must still be the difficult. Evolutionary asteroids are 82 00:04:01,000 --> 00:04:03,520 just delivering the raw materials, lowering the barrier to entry 83 00:04:03,520 --> 00:04:05,400 for life wherever the right conditions pop up. 84 00:04:05,520 --> 00:04:08,199 Speaker 2: That makes perfect sense. It's like finding out that flour 85 00:04:08,280 --> 00:04:10,879 and sugar are everywhere, but you still need the right 86 00:04:10,919 --> 00:04:13,159 oven and the right instructions to bake the cake. 87 00:04:13,759 --> 00:04:17,000 Speaker 1: So what does this raw chemistry in space actually look like. 88 00:04:17,079 --> 00:04:19,879 We're not talking about a warm primordial soup. 89 00:04:19,839 --> 00:04:22,480 Speaker 2: No, not at all. We're talking about conditions that seem 90 00:04:22,560 --> 00:04:27,040 totally hostile to complex chemistry. Ultra cold vacuum. 91 00:04:27,079 --> 00:04:28,360 Speaker 1: But radiation is the key. 92 00:04:28,639 --> 00:04:31,879 Speaker 2: That's it. In the deep cold of space, simple carbon 93 00:04:31,920 --> 00:04:34,439 and nitrogen compounds, they just freeze onto. 94 00:04:34,279 --> 00:04:39,560 Speaker 1: Dust grains and then high energy radiation cosmic rays, solar radiation. 95 00:04:39,839 --> 00:04:43,639 It just bombards these frozen grains and that energy. 96 00:04:43,399 --> 00:04:47,160 Speaker 2: Acts as a catalyst. It drives these complex chemical reactions 97 00:04:47,160 --> 00:04:51,399 that wouldn't happen otherwise. It's essentially forcing simple molecules to 98 00:04:51,480 --> 00:04:53,759 link up into complicated structures. 99 00:04:53,319 --> 00:04:56,040 Speaker 1: Like hydrocarbons and critically, amino acids. 100 00:04:56,279 --> 00:04:59,439 Speaker 2: The sources suggest this mechanism is incredibly efficient. It turns 101 00:04:59,439 --> 00:05:02,680 intercellar clouds into amino acid factories, which then get baked 102 00:05:02,680 --> 00:05:04,160 into forming asteroids. 103 00:05:04,199 --> 00:05:07,240 Speaker 1: So humbling. You look at Erth, this vibrant oasis and 104 00:05:07,279 --> 00:05:09,279 you think life is this unique special event. 105 00:05:09,519 --> 00:05:13,120 Speaker 2: But the evidence from Yugo suggests the ingredients were just waiting, 106 00:05:13,959 --> 00:05:15,879 waiting for a suitable vessel to land on. 107 00:05:16,120 --> 00:05:19,600 Speaker 1: It really raises the stakes for exoplanet research, doesn't it. 108 00:05:19,600 --> 00:05:22,920 Speaker 2: It has to. If we find a planet with liquid water, 109 00:05:23,480 --> 00:05:26,360 we now have much stronger evidence that the ingredients for 110 00:05:26,480 --> 00:05:28,639 life probably got there long long ago. 111 00:05:29,000 --> 00:05:33,360 Speaker 1: Okay, speaking of liquid water, the Reugo samples brought us 112 00:05:33,360 --> 00:05:36,240 something even more vital than amino acids, and. 113 00:05:36,160 --> 00:05:39,160 Speaker 2: Not just frozen water. This tells a much more dramatic 114 00:05:39,199 --> 00:05:40,879 story about Earth's own history. 115 00:05:41,120 --> 00:05:43,600 Speaker 1: This is where it gets really interesting and really relevant 116 00:05:43,600 --> 00:05:44,040 to us. 117 00:05:44,279 --> 00:05:49,519 Speaker 2: While they were examining these particles under incredibly advanced microscopes, 118 00:05:50,079 --> 00:05:55,680 researchers saw something amazing. Droplets droplets of liquid water trapped 119 00:05:55,720 --> 00:06:00,600 inside mineral grains, not ice, which is common. Will fluid 120 00:06:00,600 --> 00:06:03,639 water preserve for billions of years inside these rocks? 121 00:06:03,839 --> 00:06:06,240 Speaker 1: So if this water is trapped inside the mineral grains, 122 00:06:06,600 --> 00:06:09,399 does that change the timeline of when Earth got its water? 123 00:06:09,839 --> 00:06:13,160 Could it have survived the early hot period better than ice? 124 00:06:13,279 --> 00:06:17,160 Speaker 2: It absolutely changes the timeline and the survivability model. Ice 125 00:06:17,240 --> 00:06:19,480 is volatile, it would have been vaporized instantly in the 126 00:06:19,480 --> 00:06:20,720 early Earth's atmosphere. 127 00:06:20,759 --> 00:06:23,639 Speaker 1: But water truck deep inside the mineral structure. 128 00:06:23,360 --> 00:06:27,639 Speaker 2: What the sources call hydrous silicates that could survive an impact. 129 00:06:28,199 --> 00:06:31,720 It would release the water slowly, either within the Earth's 130 00:06:31,759 --> 00:06:33,879 crust or as the rock broke up. 131 00:06:34,000 --> 00:06:37,720 Speaker 1: So this is direct, undeniable proof that asteroids may have 132 00:06:37,759 --> 00:06:40,519 been the primary delivery system for Earth's oceans. 133 00:06:40,839 --> 00:06:44,079 Speaker 2: It's a profound thought. The idea that our oceans owe 134 00:06:44,160 --> 00:06:49,519 their existence to this massive, prolonged bombardment of rocks like 135 00:06:49,600 --> 00:06:52,439 Rugu slamming into a dry early Earth. 136 00:06:52,759 --> 00:06:55,560 Speaker 1: It's incredible. But the twist, as you mentioned, is that 137 00:06:55,600 --> 00:06:59,399 this water wasn't just regular water. It had this alien 138 00:06:59,439 --> 00:07:00,480 cocktail quality. 139 00:07:00,600 --> 00:07:03,959 Speaker 2: Right. The source material says its isotopic signature was slightly off. 140 00:07:04,160 --> 00:07:07,519 Speaker 1: What does that isotopic signature actually tell us? Is it 141 00:07:07,600 --> 00:07:09,040 like a chemical fingerprint. 142 00:07:09,240 --> 00:07:11,160 Speaker 2: That's a perfect way to put it. It's a figerprint 143 00:07:11,240 --> 00:07:14,199 determined by the ratio of deuterium. It's heavy hydrogen to 144 00:07:14,279 --> 00:07:17,079 standard hydrogen DH ratio, and that ratio is like a 145 00:07:17,079 --> 00:07:19,199 cosmic marker. It tells you where and when in the 146 00:07:19,199 --> 00:07:22,480 Solar system. The water formed Earth's ocean water has a 147 00:07:22,560 --> 00:07:23,639 very specific. 148 00:07:23,240 --> 00:07:25,759 Speaker 1: DA ratio, and the water in Reyugu. 149 00:07:25,399 --> 00:07:28,480 Speaker 2: It had a slightly different signature, a bit lighter than Earth's. 150 00:07:28,680 --> 00:07:31,199 Speaker 1: So it's like an ocean where every wave is made 151 00:07:31,240 --> 00:07:34,439 of a slightly different kind of salt from a different sea. 152 00:07:34,560 --> 00:07:35,560 Our oceans are like that. 153 00:07:35,639 --> 00:07:39,319 Speaker 2: Precisely, it suggests that early Earth didn't get one single 154 00:07:39,560 --> 00:07:41,120 homogeneous delivery of water. 155 00:07:41,560 --> 00:07:44,839 Speaker 1: Our oceans are a strange cocktail, a mix of multiple 156 00:07:44,879 --> 00:07:47,959 flavors of water from different asteroids comments. 157 00:07:47,639 --> 00:07:51,680 Speaker 2: Dust, each one contributing water with a slightly different chemical makeup, 158 00:07:51,839 --> 00:07:53,759 reflecting their own unique origins. 159 00:07:53,879 --> 00:07:57,879 Speaker 1: And that raises this really eerie question, if life began 160 00:07:58,120 --> 00:08:01,519 in this mixed cosmic ocean, are we the product of 161 00:08:01,560 --> 00:08:03,959 a delicate random recipe. 162 00:08:03,639 --> 00:08:06,279 Speaker 2: Or recipe that could have turned out fundamentally differently if 163 00:08:06,319 --> 00:08:09,560 other slightly varied asteroids had hit us instead. 164 00:08:09,720 --> 00:08:13,879 Speaker 1: It's a cosmic butterfly effect based entirely on random bombardment. 165 00:08:13,959 --> 00:08:16,680 Speaker 2: It's a sobering thought. Every atom in your body, every 166 00:08:16,759 --> 00:08:19,240 drop in our ocean, is the result of a specific, 167 00:08:19,319 --> 00:08:21,399 randomized event four billion years ago. 168 00:08:21,560 --> 00:08:23,879 Speaker 1: So we've got the water, we've got the basic amino acids. 169 00:08:23,959 --> 00:08:26,560 But what happens when that chemistry gets really complicated? 170 00:08:26,800 --> 00:08:29,360 Speaker 2: This is where we move beyond the basics. The complex 171 00:08:29,480 --> 00:08:32,120 organic molecules they found on both Ryugu and Venu. 172 00:08:32,360 --> 00:08:37,759 Speaker 1: We're talking hydrocarbons and structures that resemble nucleobases. 173 00:08:36,879 --> 00:08:40,120 Speaker 2: The chemical cousins of DNA's building blocks. 174 00:08:39,799 --> 00:08:43,320 Speaker 1: And the complexity is just astonishing, especially considering the environment. 175 00:08:43,759 --> 00:08:47,200 Speaker 2: And again, the key is how they formed raw chemistry 176 00:08:47,759 --> 00:08:52,320 freezing cold vacuum radiation, just like the amino acids. 177 00:08:52,440 --> 00:08:55,120 Speaker 1: It just proves that the step just shy of life. 178 00:08:55,200 --> 00:08:59,679 The creation of this highly complex organic chemistry is happening 179 00:08:59,759 --> 00:09:02,320 all over space quietly constantly. 180 00:09:02,399 --> 00:09:04,000 Speaker 2: It's universal chemistry at work. 181 00:09:04,080 --> 00:09:06,720 Speaker 1: And the Japanese researchers in twenty twenty two took this 182 00:09:06,799 --> 00:09:10,879 even further. They reported an observation that almost borders on biology. 183 00:09:11,000 --> 00:09:13,080 Speaker 2: I know what you're talking about. They noted that some 184 00:09:13,120 --> 00:09:16,200 of these carbon rich molecules in the Ryugu samples had 185 00:09:16,279 --> 00:09:19,080 organized themselves into spherical, bubble like shapes. 186 00:09:19,200 --> 00:09:21,720 Speaker 1: They literally resembled primitive cell membranes. 187 00:09:21,799 --> 00:09:24,799 Speaker 2: They called them proto cells, and this is maybe the 188 00:09:24,799 --> 00:09:27,639 most compelling piece of evidence we have for the ubiquity 189 00:09:27,679 --> 00:09:28,559 of life's potential. 190 00:09:28,639 --> 00:09:31,159 Speaker 1: They weren't alive, they weren't replicating, no, but. 191 00:09:31,200 --> 00:09:34,240 Speaker 2: They were the self assembled structures that scientists believe were 192 00:09:34,279 --> 00:09:38,519 the crucial stepping stone towards forming actual biological cell walls. 193 00:09:38,720 --> 00:09:42,200 Speaker 1: They looked disturbingly close to what the very first living 194 00:09:42,279 --> 00:09:44,039 things on Earth must have looked like. 195 00:09:44,320 --> 00:09:48,919 Speaker 2: So the significance is just enormous. If these structures, the 196 00:09:49,039 --> 00:09:53,120 very architecture of life, can spontaneously self assemble in the 197 00:09:53,120 --> 00:09:54,360 cold vacuum. 198 00:09:53,960 --> 00:09:57,440 Speaker 1: Of space, then the very first tentative stages of life 199 00:09:57,559 --> 00:09:59,080 might not be rare at all. 200 00:09:59,120 --> 00:10:01,840 Speaker 2: They might just be way for the right environment, but 201 00:10:01,960 --> 00:10:05,480 the heavy lifting of chemical organization is already done. 202 00:10:05,559 --> 00:10:08,879 Speaker 1: The sources suggest that this is a chemical inevitability driven 203 00:10:08,960 --> 00:10:13,240 by physics. The surfaces of these asteroids act like a scaffold. 204 00:10:12,840 --> 00:10:16,279 Speaker 2: So the leads from chemistry to biology might be happening 205 00:10:16,360 --> 00:10:18,679 quietly inside asteroids all over. 206 00:10:18,559 --> 00:10:22,159 Speaker 1: The universe, millions of false starts where conditions weren't quite 207 00:10:22,240 --> 00:10:25,480 right for the next step, but the initial organization still happened. 208 00:10:25,559 --> 00:10:28,559 Speaker 2: That initial organization is the difference between having all the 209 00:10:28,639 --> 00:10:32,320 raw materials for a house and having the blueprint automatically 210 00:10:32,360 --> 00:10:35,679 assemble the walls. That is a massive headstart for life. 211 00:10:35,720 --> 00:10:39,240 Speaker 1: Okay, we've established that asteroids are cosmic chemistry sets, but 212 00:10:39,279 --> 00:10:41,519 they are also these ultimate time capsules, right. 213 00:10:41,559 --> 00:10:45,879 Speaker 2: They contain records of events far far older than Earth itself. 214 00:10:45,720 --> 00:10:48,840 Speaker 1: Which brings us to section two. We're getting into the 215 00:10:48,879 --> 00:10:52,360 geological and physical anomalies found in these samples that are 216 00:10:52,440 --> 00:10:57,000 genuinely challenging our entire understanding of the Solar System's formation. 217 00:10:56,879 --> 00:10:59,320 Speaker 2: And we have to start with something truly mind bending. 218 00:11:00,120 --> 00:11:03,879 The discovery of dust grains that are literally older than 219 00:11:03,960 --> 00:11:04,320 the Sun. 220 00:11:04,600 --> 00:11:08,320 Speaker 1: The sources called them presolar grains found in meteorites and 221 00:11:08,360 --> 00:11:12,080 these new asteroid samples. I read one scientist describe holding 222 00:11:12,120 --> 00:11:15,960 that dust as like touching the ghost of an ancient galaxy. 223 00:11:16,159 --> 00:11:17,120 Speaker 2: It's a perfect description. 224 00:11:17,320 --> 00:11:20,320 Speaker 1: Conceptually, how is that even possible? Shouldn't everything in our 225 00:11:20,320 --> 00:11:22,080 Solar system have formed at the same time. 226 00:11:22,480 --> 00:11:25,759 Speaker 2: This is where we have to confront deep time, the 227 00:11:25,799 --> 00:11:29,480 cycle of stellar death and rebirth. Okay, our Solar system 228 00:11:29,600 --> 00:11:32,960 formed from a huge nebula, a cloud of gas and dust. 229 00:11:33,519 --> 00:11:36,600 But that cloud wasn't created fresh, It was polluted by 230 00:11:36,600 --> 00:11:38,759 the debris of previous stellar generations. 231 00:11:38,840 --> 00:11:41,159 Speaker 1: Yes, so these presolar grains. 232 00:11:40,799 --> 00:11:44,159 Speaker 2: Be formed in the violent outflows of ancient dying stars 233 00:11:44,200 --> 00:11:48,159 supernova's giant stars, billions of years before the specific event 234 00:11:48,240 --> 00:11:49,919 that created our sun in our planets. 235 00:11:50,200 --> 00:11:53,399 Speaker 1: So holding these grains means you're holding time itself, a 236 00:11:53,440 --> 00:11:56,159 piece of something literally older than the star that lights 237 00:11:56,159 --> 00:11:58,279 our sky, a relic of alien stars. 238 00:11:58,600 --> 00:12:02,159 Speaker 2: Absolutely, and miss Tree isn't just their origin, it's their survival. 239 00:12:02,200 --> 00:12:04,960 Speaker 1: We're talking about tiny particles right fractions. 240 00:12:04,519 --> 00:12:08,720 Speaker 2: Of a millimeter, and these tiny specs endured immense cosmic radiation, 241 00:12:09,399 --> 00:12:13,279 violent collisions, the chaotic, high energy birth of our Solar system, 242 00:12:13,720 --> 00:12:16,639 and somehow made it intact into the asteroid material that 243 00:12:16,679 --> 00:12:17,720 eventually reached us. 244 00:12:18,080 --> 00:12:20,799 Speaker 1: That survival story is just extraordinary. It tells us that 245 00:12:20,840 --> 00:12:23,799 the processes that build planetary systems aren't as efficient at 246 00:12:23,840 --> 00:12:25,080 mixing everything up as we thought. 247 00:12:25,159 --> 00:12:29,279 Speaker 2: It leads these pockets of primordial ancient material untouched. It 248 00:12:29,399 --> 00:12:33,879 challenges our fundamental models, suggesting the early solar nebula was patchy, 249 00:12:34,240 --> 00:12:37,080 allowing these ancient remnants to be incorporated into the parent 250 00:12:37,120 --> 00:12:38,559 bodies of Benu and Rugu. 251 00:12:38,919 --> 00:12:42,080 Speaker 1: Okay, from the very oldest things to the very strangest. 252 00:12:42,480 --> 00:12:45,320 Let's talk about the magnetic signatures and the osiris REX 253 00:12:45,360 --> 00:12:46,279 samples from Benu. 254 00:12:46,480 --> 00:12:49,120 Speaker 2: The was it returned in twenty twenty three. This is 255 00:12:49,120 --> 00:12:52,559 an anomaly that genuinely shocked researchers because it seems to 256 00:12:52,639 --> 00:12:55,279 defy the known physics of small bodies. 257 00:12:55,600 --> 00:12:58,720 Speaker 1: The shock was profound. Some of the minerals they looked 258 00:12:58,720 --> 00:13:01,559 at contained magnetic scins signatures that were frozen in place 259 00:13:01,639 --> 00:13:03,039 billions of years ago. 260 00:13:02,919 --> 00:13:06,120 Speaker 2: And they just didn't match Earth, the Moon, or the 261 00:13:06,639 --> 00:13:09,759 expected weak magnetic fields of the early Solar System. 262 00:13:09,799 --> 00:13:12,879 Speaker 1: Why is that so shocking. Benu is a small asteroid, 263 00:13:12,919 --> 00:13:15,720 a rubble pile. It shouldn't have a magnetic field strong 264 00:13:15,799 --> 00:13:16,399 enough to do that. 265 00:13:16,440 --> 00:13:19,519 Speaker 2: Right Exactly, For a body to generate a strong, lasting 266 00:13:19,559 --> 00:13:24,279 magnetic field, it needs an internal dynamo, a molten convecting 267 00:13:24,399 --> 00:13:28,039 core like Earth has. Benu is way too small and 268 00:13:28,080 --> 00:13:29,320 his long since cooled. 269 00:13:29,080 --> 00:13:32,000 Speaker 1: Down, so its own magnetic field should be negligible. The 270 00:13:32,039 --> 00:13:36,200 presence of these strong, frozen signatures is a complete puzzle. 271 00:13:36,320 --> 00:13:38,960 It is, so what's the consensus? What are the potential 272 00:13:39,039 --> 00:13:41,200 origins of that ancient field. 273 00:13:41,639 --> 00:13:44,519 Speaker 2: The scientific community has a couple of primary options. Option 274 00:13:44,600 --> 00:13:47,039 one is that Benu was once part of a much 275 00:13:47,159 --> 00:13:48,519 larger parent body. 276 00:13:48,240 --> 00:13:50,799 Speaker 1: A proto planet, maybe hundreds of miles wide. 277 00:13:50,639 --> 00:13:53,840 Speaker 2: One that did have an active, churning magnetic core. Benu 278 00:13:53,919 --> 00:13:57,200 is just a fragment that retains that ancient signature. 279 00:13:56,879 --> 00:14:00,440 Speaker 1: Which reinforces that idea of violent destruction and reassembling. An 280 00:14:00,440 --> 00:14:04,639 option too, that Benu traveled through regions of space where powerful, 281 00:14:04,759 --> 00:14:09,279 strange magnetic fields existed that we just don't understand. 282 00:14:08,840 --> 00:14:13,679 Speaker 2: Yet, or fields generated by some specific astronomical event near 283 00:14:13,720 --> 00:14:15,440 the asteroid build. 284 00:14:15,120 --> 00:14:18,679 Speaker 1: So external forces affecting the rocks, not internal ones. 285 00:14:18,440 --> 00:14:21,720 Speaker 2: Right, But the parent body hypothesis is the most popular one. 286 00:14:21,840 --> 00:14:24,559 It connects directly to that robo pile structure we keep 287 00:14:24,600 --> 00:14:25,200 talking about. 288 00:14:25,399 --> 00:14:28,159 Speaker 1: It paints a picture of a Solar System history that's 289 00:14:28,320 --> 00:14:30,600 far more violent in structure than we had imagined. 290 00:14:30,720 --> 00:14:33,639 Speaker 2: It does. It suggests that when we study Beenu and Riugu, 291 00:14:34,000 --> 00:14:37,879 we're actually studying the broken pieces of a failed planetary core. 292 00:14:38,200 --> 00:14:41,120 Speaker 1: Okay, now, let's get into the preserved atmospheres and miniature 293 00:14:41,120 --> 00:14:43,120 oceans locked inside these samples. 294 00:14:43,279 --> 00:14:46,759 Speaker 2: When they opened the sealed Benu canister, it revealed these 295 00:14:46,840 --> 00:14:48,759 tiny pockets of trapped. 296 00:14:48,559 --> 00:14:51,799 Speaker 1: Gases carbon dioxide and nitrogen that pre date Earth. 297 00:14:51,879 --> 00:14:54,279 Speaker 2: These are gases that have been locked away inside mineral 298 00:14:54,279 --> 00:14:59,639 pores for over four billion years, untouched, pristine ancient atmosphere 299 00:14:59,679 --> 00:15:00,480 exam and. 300 00:15:00,440 --> 00:15:04,399 Speaker 1: Their ratios, their signatures were completely alien. They didn't match 301 00:15:04,480 --> 00:15:06,720 Earth's atmosphere, or Mars or the Sun. 302 00:15:07,200 --> 00:15:10,440 Speaker 2: It's like getting a historical sample of the cosmic environment 303 00:15:10,480 --> 00:15:14,480 that existed before the planet's truly solidified, a sniff of 304 00:15:14,519 --> 00:15:16,080 the early Solar System's. 305 00:15:15,679 --> 00:15:18,360 Speaker 1: Breath, and that ties right into the findings from Yugo 306 00:15:18,440 --> 00:15:19,879 Dust about the salty pockets. 307 00:15:20,320 --> 00:15:25,799 Speaker 2: Yes, Regu contained salt crystals, sodium and chlorine compounds that 308 00:15:25,879 --> 00:15:29,639 look suspiciously like the salts dissolved in Earth's oceans. 309 00:15:29,360 --> 00:15:33,559 Speaker 1: Which suggests liquid water once flow through Rhyugu's parent body. 310 00:15:33,679 --> 00:15:36,399 Speaker 2: Dissolving these salts and trapping them in mineral veins. 311 00:15:36,679 --> 00:15:40,039 Speaker 1: This is a major finding. It raises the haunting possibility 312 00:15:40,080 --> 00:15:44,159 that asteroid fragments may have once hosted miniature alien erceans 313 00:15:44,240 --> 00:15:45,200 deep inside. 314 00:15:44,919 --> 00:15:49,159 Speaker 2: Them, wet pockets inside dry rocks, laughing for millions of years. 315 00:15:49,360 --> 00:15:52,440 Speaker 1: It's a powerful visualization. A rock drifting through the void 316 00:15:52,519 --> 00:15:56,519 and deep inside thermal decay provides enough heat to melt ice. 317 00:15:56,639 --> 00:15:59,399 Speaker 2: You get these salty pockets of water slashing around, maybe 318 00:15:59,440 --> 00:16:02,799 from millions of years, providing conditions ripe for complex organic 319 00:16:02,879 --> 00:16:03,919 chemistry to evolve. 320 00:16:04,080 --> 00:16:06,960 Speaker 1: The idea that these dry, dusty objects were once small, 321 00:16:07,039 --> 00:16:10,200 wet worlds, but definitely unsettled scientists. 322 00:16:10,360 --> 00:16:12,759 Speaker 2: It confirms that water is far more pervasive in the 323 00:16:12,759 --> 00:16:14,279 asteroid built than we thought. 324 00:16:14,320 --> 00:16:17,240 Speaker 1: And here is where the awe starts to transition directly 325 00:16:17,279 --> 00:16:22,480 into hazard. The discovery of radioactive isotopes in the Benu samples. 326 00:16:22,039 --> 00:16:25,120 Speaker 2: The ones that seemed far too fresh to be billions 327 00:16:25,120 --> 00:16:25,759 of years old. 328 00:16:26,159 --> 00:16:31,200 Speaker 1: Normally, these isotopes decay relatively quickly on a cosmological timescale. 329 00:16:30,559 --> 00:16:34,440 Speaker 2: So their presence suggested ongoing processes were either renewing or 330 00:16:34,480 --> 00:16:38,320 preserving them, which means the rock itself is actively generating 331 00:16:38,440 --> 00:16:40,159 or accumulating dangerous energy. 332 00:16:40,320 --> 00:16:44,159 Speaker 1: That's a genuinely disturbing find, it is, So what are 333 00:16:44,159 --> 00:16:47,840 the primary explanations for this fresh radioactivity? 334 00:16:47,960 --> 00:16:52,080 Speaker 2: The source material focuses on two possibilities. The first, and 335 00:16:52,200 --> 00:16:55,480 most likely is that Benu is constantly being bombarded by 336 00:16:55,519 --> 00:16:57,279 high energy cosmic rays. 337 00:16:57,159 --> 00:16:59,799 Speaker 1: And when those rays strike, the atoms in the rock. 338 00:17:00,000 --> 00:17:03,519 Speaker 2: Trigger a nuclear reaction that creates new, fresh, short lived 339 00:17:03,519 --> 00:17:04,920 isotopes right on the spot. 340 00:17:05,160 --> 00:17:07,519 Speaker 1: So the sheer violence of its existence in space is 341 00:17:07,519 --> 00:17:09,359 what keeps it radioactive exactly. 342 00:17:09,880 --> 00:17:13,039 Speaker 2: The second explanation is much stranger and harder to prove. 343 00:17:13,480 --> 00:17:16,880 It's that these isotopes are leftovers from violent nuclear processes 344 00:17:16,920 --> 00:17:19,880 in the earliest days of the Solar System, processes we 345 00:17:19,960 --> 00:17:21,559 don't fully understand. 346 00:17:21,240 --> 00:17:24,440 Speaker 1: But either way, it means these rocks are not inert. 347 00:17:24,519 --> 00:17:28,279 Speaker 2: And that's a clear shift from inert rocks to active 348 00:17:28,319 --> 00:17:30,440 records of violent radioactive processes. 349 00:17:30,519 --> 00:17:32,039 Speaker 1: So what's the hazard implication? 350 00:17:32,480 --> 00:17:36,000 Speaker 2: The source material connects this directly to threat assessment. If 351 00:17:36,000 --> 00:17:38,200 these asteroids are filled with unstable. 352 00:17:37,720 --> 00:17:40,759 Speaker 1: Isotopes and they're constantly producing new ones, then. 353 00:17:40,680 --> 00:17:43,759 Speaker 2: They aren't just massive inert projectiles. If they hit Earth, 354 00:17:44,279 --> 00:17:47,039 they could release bursts of radiation or heat when they 355 00:17:47,119 --> 00:17:48,400 enter the atmosphere. 356 00:17:47,960 --> 00:17:51,559 Speaker 1: Or explode, adding another unknown layer of danger to the 357 00:17:51,640 --> 00:17:52,559 kinetic impact. 358 00:17:52,799 --> 00:17:55,599 Speaker 2: They are active records of violence that shape the early universe, 359 00:17:55,640 --> 00:17:57,160 and they are still carrying that energy. 360 00:17:57,279 --> 00:17:59,880 Speaker 1: If the first half of this deep dive was about 361 00:17:59,880 --> 00:18:02,799 the genesis of life, the second half has to be 362 00:18:02,799 --> 00:18:06,640 about the perpetual threat of well, the termination of civilization. 363 00:18:06,960 --> 00:18:09,720 Speaker 2: We have to confront the reality that the objects that 364 00:18:09,759 --> 00:18:12,880 deliver the water and amino acids are also the objects 365 00:18:12,920 --> 00:18:13,880 that could wipe us out. 366 00:18:14,079 --> 00:18:16,960 Speaker 1: Let's start with how scientists even quantify this danger. 367 00:18:17,279 --> 00:18:20,240 Speaker 2: Since the early two thousands, we've had a systematic approach 368 00:18:20,519 --> 00:18:24,079 using two primary scales. It's not just about spotting them, 369 00:18:24,359 --> 00:18:27,119 it's about translating that data into actionable risk. 370 00:18:27,480 --> 00:18:29,200 Speaker 1: Give us the technical scale first. 371 00:18:29,400 --> 00:18:32,359 Speaker 2: That would be the Palermo Technical Impact Scale. It's used 372 00:18:32,359 --> 00:18:34,240 by astronomers and government agencies. 373 00:18:34,559 --> 00:18:37,640 Speaker 1: It's technical because it combines two critical pieces of data. 374 00:18:37,680 --> 00:18:41,519 Speaker 2: The precise probability of impact and the estimated kinetic yield 375 00:18:42,160 --> 00:18:44,759 basically how much energy would be released if it hit, 376 00:18:45,160 --> 00:18:46,240 measured in megatons. 377 00:18:46,519 --> 00:18:49,400 Speaker 1: So it's the how likely and how badly scale all 378 00:18:49,440 --> 00:18:51,400 in one number for the professional exactly. 379 00:18:51,599 --> 00:18:53,680 Speaker 2: And the second one is the Terno scale. 380 00:18:53,359 --> 00:18:57,279 Speaker 1: Which is simpler, color coded and intended for the public. 381 00:18:57,359 --> 00:19:02,039 It goes from zero no hazard to ten suating global catastrophe. 382 00:19:02,160 --> 00:19:04,359 Speaker 2: And it was the Terino skull that was famously used 383 00:19:04,359 --> 00:19:07,079 when the asteroid Ofpofue was first discovered. 384 00:19:06,680 --> 00:19:09,319 Speaker 1: Right Apoffus was the first asteroid ever given a level 385 00:19:09,359 --> 00:19:11,960 one rating back in two thousand and four. Even at 386 00:19:12,000 --> 00:19:14,400 the lowest risk level, that was enough to send a 387 00:19:14,440 --> 00:19:15,759 clear message pay attention. 388 00:19:16,200 --> 00:19:18,519 Speaker 2: It was a massive wake up call, forcing us to 389 00:19:18,519 --> 00:19:20,559 standardize how we talk about planetary defense. 390 00:19:20,839 --> 00:19:23,839 Speaker 1: Okay, now let's connect the life giving aspect back to 391 00:19:23,920 --> 00:19:26,000 the threat Benuz structure. 392 00:19:26,480 --> 00:19:29,480 Speaker 2: We learned that the samples from Yugu and Benu revealed 393 00:19:29,680 --> 00:19:33,279 shock veins, fractures, impact scars. 394 00:19:33,640 --> 00:19:38,559 Speaker 1: They're largely rubble piles, shattered, reassembled, and shattered again. 395 00:19:38,720 --> 00:19:43,039 Speaker 2: And this is perhaps the profound worry for deflection technology. 396 00:19:42,559 --> 00:19:45,359 Speaker 1: Because missions like Dart, which showed we can hit an 397 00:19:45,400 --> 00:19:49,079 asteroid to change its trajectory. Are based on the idea 398 00:19:49,200 --> 00:19:51,039 of pushing a solid object. 399 00:19:51,200 --> 00:19:55,440 Speaker 2: But because asteroids like Benu are these fractured, loose collections 400 00:19:55,480 --> 00:19:59,680 of debris held together by weak gravity, deflecting them becomes 401 00:19:59,720 --> 00:20:01,079 ex ponentially more difficult. 402 00:20:01,160 --> 00:20:03,519 Speaker 1: So what are the implications. If you hit a solid rock, 403 00:20:03,559 --> 00:20:06,000 you change its course. If you hit a pile of rubble. 404 00:20:06,119 --> 00:20:08,000 Speaker 2: If you push a pile of rubble too hard, it 405 00:20:08,000 --> 00:20:09,440 could simply break apart. 406 00:20:09,160 --> 00:20:11,599 Speaker 1: And instead of one impactor that you nudged away, you. 407 00:20:11,559 --> 00:20:15,799 Speaker 2: Get a shotgun blast of civilization ending debris, potentially scattering 408 00:20:15,799 --> 00:20:17,759 the threat across a wider area of Earth. 409 00:20:17,839 --> 00:20:20,559 Speaker 1: So a planetary defense isn't just about finding them, it's 410 00:20:20,599 --> 00:20:22,160 about knowing what they're made of. 411 00:20:22,920 --> 00:20:27,799 Speaker 2: The composition dictates the strategy. The structural integrity is the 412 00:20:27,799 --> 00:20:28,680 real complexity. 413 00:20:28,920 --> 00:20:31,640 Speaker 1: So, speaking of Venue, even though we got the samples, 414 00:20:32,039 --> 00:20:34,119 it remains firmly on the hazardous list. 415 00:20:34,279 --> 00:20:36,759 Speaker 2: It does a s AB one nine GUY five. Venu 416 00:20:36,880 --> 00:20:39,960 remains a potentially hazardous object with a calculated one in 417 00:20:40,039 --> 00:20:43,480 twenty and seven hundred chance of impacting Earth between twenty 418 00:20:43,480 --> 00:20:44,880 one seventy eight and twenty two. 419 00:20:44,880 --> 00:20:48,559 Speaker 1: Ninety and there's a specific day that has the highest probability. 420 00:20:48,279 --> 00:20:51,640 Speaker 2: September twenty fourth, twenty one eighty two. If it did hit, 421 00:20:52,000 --> 00:20:54,400 the force would be measured in billions of tons of 422 00:20:54,440 --> 00:20:57,839 TNT equivalent, enough to wipe out a continent and cause 423 00:20:57,880 --> 00:20:59,720 catastrophic global climate effects. 424 00:21:00,000 --> 00:21:02,599 Speaker 1: And while that deed is outside our lifetime, the monitoring 425 00:21:02,680 --> 00:21:06,000 is constant because any small gravitational nudge over the next 426 00:21:06,000 --> 00:21:09,680 century could shift that likelihood dramatically. Exactly all right, Let's 427 00:21:09,680 --> 00:21:12,240 move to the most alarming data in the sources. The 428 00:21:12,279 --> 00:21:15,480 catalog of close calls the sheer number and scale of 429 00:21:15,519 --> 00:21:16,160 these objects. 430 00:21:16,200 --> 00:21:17,839 Speaker 2: We need to slow down here and let the scale 431 00:21:17,960 --> 00:21:18,720 really register. 432 00:21:18,880 --> 00:21:21,319 Speaker 1: Let's start with the giants, the extinction level. 433 00:21:21,119 --> 00:21:24,160 Speaker 2: Threats, the ones that are a kilometer or more in size. 434 00:21:24,240 --> 00:21:26,359 The statistics on these are hard to grasp, but they 435 00:21:26,359 --> 00:21:28,359 are the reason planetary defense exists. 436 00:21:28,640 --> 00:21:31,279 Speaker 1: We have to start with nineteen fifty DA. The sources 437 00:21:31,319 --> 00:21:32,160 call it the Monster. 438 00:21:32,440 --> 00:21:36,160 Speaker 2: It's about a kilometer wide. It's firmly in the category 439 00:21:36,200 --> 00:21:38,200 of objects that could cause a global. 440 00:21:37,839 --> 00:21:41,920 Speaker 1: Catastrophe, a kin to what ended the dinosaurs, maybe worse. 441 00:21:42,079 --> 00:21:44,599 Speaker 2: It has a slim but real chance about one in 442 00:21:44,680 --> 00:21:47,440 four thousand of impacting Earth in the future. 443 00:21:47,200 --> 00:21:51,359 Speaker 1: And the power calculation for that size is just staggering. 444 00:21:51,480 --> 00:21:54,559 Speaker 2: An impact from nineteen fifty DA would release the energy 445 00:21:55,000 --> 00:21:58,039 of forty four eight hundred megatons of TNT. 446 00:21:58,400 --> 00:22:01,319 Speaker 1: For a perspective, the largest nuke weapon ever tested was 447 00:22:01,319 --> 00:22:02,599 around fifty mega tons. 448 00:22:02,720 --> 00:22:05,720 Speaker 2: Is nearly a thousand times that the Source material says. 449 00:22:05,720 --> 00:22:07,680 It would make the demise of the dinosaurs seem like 450 00:22:07,720 --> 00:22:10,880 a picnic. It would plunge the Earth into a nuclear winter. 451 00:22:11,039 --> 00:22:13,839 Speaker 1: And we've been tracking this monster since nineteen fifty we have. 452 00:22:13,960 --> 00:22:16,279 Speaker 2: Then there's one that just went missing for four decades, 453 00:22:16,960 --> 00:22:18,119 nineteen seventy nine XP. 454 00:22:18,440 --> 00:22:20,799 Speaker 1: The fact that a half mile wide rock just got 455 00:22:20,839 --> 00:22:23,119 lost is profoundly unsettling to me. 456 00:22:23,240 --> 00:22:26,240 Speaker 2: It's nearly twenty three hundred feet across. If nineteen fifty 457 00:22:26,319 --> 00:22:28,880 DA is a monster, this is a true end of 458 00:22:28,880 --> 00:22:30,599 the world asteroid, capable. 459 00:22:30,240 --> 00:22:33,079 Speaker 1: Of massive climate change, continent scale destruction. 460 00:22:33,240 --> 00:22:36,599 Speaker 2: Its calculated impact energy would be thirty billion tons of TNT. 461 00:22:36,880 --> 00:22:40,119 Speaker 1: Thirty billion tons. That's an unimaginable force. Why do we 462 00:22:40,200 --> 00:22:40,559 lose it? 463 00:22:40,720 --> 00:22:43,680 Speaker 2: Well, it was lost in space for four decades because 464 00:22:43,759 --> 00:22:46,880 early telescopes couldn't maintain a solid lock on its orbit. 465 00:22:47,200 --> 00:22:51,200 Speaker 1: It's highly elliptical, but newer systems have founded Again they have. 466 00:22:51,680 --> 00:22:55,480 Speaker 2: But the lack of recent precise data makes its path 467 00:22:55,559 --> 00:22:58,720 a little murkier than for other objects we've watched consistently. 468 00:22:58,799 --> 00:23:02,519 Speaker 1: We also have nineteen ninety seven x F eleven, another 469 00:23:02,559 --> 00:23:06,359 dinosaur killer a mile wide, and it's coming extremely close 470 00:23:06,400 --> 00:23:07,319 in twenty twenty eight. 471 00:23:07,720 --> 00:23:10,880 Speaker 2: This is one of the most frightening large objects we track. 472 00:23:11,160 --> 00:23:14,319 An impact would be like a one million megaton. 473 00:23:13,880 --> 00:23:16,640 Speaker 1: Bomb, almost certainly wiping out most life on Earth. 474 00:23:16,839 --> 00:23:19,880 Speaker 2: Fortunately, calculations show will miss in twenty twenty eight, but 475 00:23:19,960 --> 00:23:23,200 its sheer size and proximity drive home the constant danger, 476 00:23:23,240 --> 00:23:23,640 and we have. 477 00:23:23,599 --> 00:23:26,000 Speaker 1: To mention forty one to eighty three Kuno. This one 478 00:23:26,079 --> 00:23:31,039 is about four kilometers in diameter, significantly larger Kuno is gargantuan. 479 00:23:31,160 --> 00:23:33,839 Speaker 2: It poses no imminent threat, but it's made close approaches 480 00:23:33,880 --> 00:23:37,160 six times in this century alone. These larger objects require 481 00:23:37,160 --> 00:23:40,079 constant vigilance because they're absolute civilizational threats. 482 00:23:40,240 --> 00:23:42,960 Speaker 1: Okay, let's move to the city killers and regional hazards. 483 00:23:43,200 --> 00:23:44,880 These are the ones that remind us we don't need 484 00:23:44,880 --> 00:23:46,799 a dinosaur killer to have a catastrophe. 485 00:23:46,880 --> 00:23:49,759 Speaker 2: It's exactly take one, five, three, eight one two, two 486 00:23:49,759 --> 00:23:53,640 thousand and one WN five. It's classified as a small asteroid, 487 00:23:53,799 --> 00:23:55,519 but that term is so misleading. 488 00:23:55,680 --> 00:23:58,599 Speaker 1: At point nine kilometers in diameter, it's larger than ninety 489 00:23:58,599 --> 00:24:01,680 seven percent of other small asteroids, about the size of 490 00:24:01,720 --> 00:24:02,640 the Golden gate Bridge. 491 00:24:02,680 --> 00:24:05,799 Speaker 2: It's the regional thread parks lawns, and its close approach 492 00:24:05,880 --> 00:24:06,279 is soon. 493 00:24:06,480 --> 00:24:09,519 Speaker 1: This is a real world near term close call. 494 00:24:09,720 --> 00:24:12,039 Speaker 2: On June twenty sixth, twenty twenty eight, it will pass 495 00:24:12,079 --> 00:24:14,240 at a distance of two hundred and forty eight thousand, 496 00:24:14,400 --> 00:24:15,680 seven hundred kilometers. 497 00:24:15,720 --> 00:24:18,119 Speaker 1: That is significantly closer than the Moon, and it will 498 00:24:18,160 --> 00:24:21,160 be visible with just binoculars, highlighting just how close. 499 00:24:21,240 --> 00:24:22,400 Speaker 2: This potential disastrous. 500 00:24:22,759 --> 00:24:26,559 Speaker 1: So why are scientists watching this flyby so intently even 501 00:24:26,599 --> 00:24:28,400 if it's projected to miss, Because. 502 00:24:28,160 --> 00:24:31,400 Speaker 2: Earth's gravity could subtly change its orbit, a phenomenon called 503 00:24:31,400 --> 00:24:32,680 the Yarkowski. 504 00:24:32,119 --> 00:24:34,160 Speaker 1: Effect, and that slight nudge could line it up for 505 00:24:34,200 --> 00:24:36,599 a much worse scenario on a future pass fifty or 506 00:24:36,599 --> 00:24:37,519 sixty years from now. 507 00:24:37,640 --> 00:24:40,240 Speaker 2: Every close encounter is a moment of orbital recalculation. 508 00:24:40,440 --> 00:24:42,839 Speaker 1: Then there are the immediate threats that caused recent alarm 509 00:24:43,079 --> 00:24:47,079 twenty twenty one Q one only fifty meters, which sounds small. 510 00:24:46,960 --> 00:24:49,720 Speaker 2: Until you hear the projected impact for US. Should it hit, 511 00:24:49,839 --> 00:24:51,839 it would be about six megatons of TNT. 512 00:24:52,200 --> 00:24:54,680 Speaker 1: That's four hundred times the strength of the bomb dropped 513 00:24:54,680 --> 00:24:55,319 on Hiroshimo. 514 00:24:55,480 --> 00:24:58,480 Speaker 2: It would flatten a major city. And this asteroid actually 515 00:24:58,519 --> 00:25:02,640 disappeared behind the sun shortly after discovery, so scientists lost 516 00:25:02,640 --> 00:25:03,119 track of it. 517 00:25:03,240 --> 00:25:05,640 Speaker 1: They lost sight of a city killer. What happened. 518 00:25:05,720 --> 00:25:08,480 Speaker 2: They had to use the European Southern Observatory's very large 519 00:25:08,519 --> 00:25:11,920 telescope and managed to capture an image of the faintest 520 00:25:11,960 --> 00:25:15,319 asteroid ever observed to get its trajectory. 521 00:25:14,759 --> 00:25:17,559 Speaker 1: Back, and thankfully it's not on a collision course for. 522 00:25:17,559 --> 00:25:20,640 Speaker 2: The foreseeable future. No, but it shows how hard these 523 00:25:20,680 --> 00:25:21,440 things are to track. 524 00:25:21,559 --> 00:25:25,319 Speaker 1: And the newest scare twenty twenty three DW. 525 00:25:25,200 --> 00:25:28,640 Speaker 2: Spotted in February twenty twenty three Olympic swimming pool, sized 526 00:25:28,920 --> 00:25:32,559 about fifty meters at one point. NASA flagged March fourteenth, 527 00:25:32,680 --> 00:25:35,440 twenty forty six as a potential impact date with a 528 00:25:35,440 --> 00:25:37,079 one in five hundred and sixty chance. 529 00:25:37,200 --> 00:25:39,160 Speaker 1: The odds have dropped, but it's still classified as a 530 00:25:39,160 --> 00:25:39,960 city killer. 531 00:25:39,839 --> 00:25:42,720 Speaker 2: Absolutely not a planet killer, but enough to take out 532 00:25:42,720 --> 00:25:43,359 a city. 533 00:25:43,160 --> 00:25:46,480 Speaker 1: And Finally, the true Tunguska twin two thousand, SG three 534 00:25:46,640 --> 00:25:47,279 forty four. 535 00:25:47,119 --> 00:25:49,240 Speaker 2: School bus sized with a one in three hundred and 536 00:25:49,279 --> 00:25:51,920 sixty chance of collision in twenty seventy one, An impact 537 00:25:51,920 --> 00:25:53,400 could release one mega ton of. 538 00:25:53,359 --> 00:25:56,519 Speaker 1: TNT, similar to the nineteen oh eight Tenguska event, which 539 00:25:56,559 --> 00:25:59,960 flattened over two thousand square kilometers of forest in Siberia. 540 00:26:00,319 --> 00:26:02,559 Speaker 2: Right, And the truly odd thing about this. 541 00:26:02,480 --> 00:26:04,640 Speaker 1: One is that some scientists think it might not even 542 00:26:04,720 --> 00:26:05,440 be an asteroid. 543 00:26:05,839 --> 00:26:09,200 Speaker 2: That's the fascinating detail. Its path is so similar to 544 00:26:09,240 --> 00:26:12,599 Earth's orbit that it could actually be a leftover Apollo 545 00:26:12,720 --> 00:26:15,039 rocket booster that was discarded decades ago. 546 00:26:15,279 --> 00:26:17,640 Speaker 1: Is it a threat or just space jump coming home? 547 00:26:17,720 --> 00:26:19,599 Speaker 2: We'll get another chance to see when it passes close 548 00:26:19,599 --> 00:26:20,720 again in twenty twenty eight. 549 00:26:20,799 --> 00:26:22,839 Speaker 1: Okay, we have to dedicate a full segment to the 550 00:26:22,880 --> 00:26:26,799 asteroid that has become the definitive test run for planetary 551 00:26:26,799 --> 00:26:29,160 defense A Office. 552 00:26:29,000 --> 00:26:32,240 Speaker 2: Nine nine nine four to two a P Office. It 553 00:26:32,279 --> 00:26:34,480 frightened the world in two thousand and four, YEA with 554 00:26:34,519 --> 00:26:36,880 a one in sixty chance of hitting Earth on Friday 555 00:26:36,880 --> 00:26:38,960 the thirteenth May twenty twenty nine. 556 00:26:39,079 --> 00:26:41,680 Speaker 1: That risk has been ruled out thankfully, But the close 557 00:26:41,720 --> 00:26:44,000 pass is still happening and it's going to be monumental. 558 00:26:44,079 --> 00:26:47,119 Speaker 2: The pass is on April thirteenth, twenty twenty nine, and 559 00:26:47,200 --> 00:26:47,720 how close. 560 00:26:48,079 --> 00:26:50,279 Speaker 1: Just nineteen thousand miles from Earth. 561 00:26:50,440 --> 00:26:52,680 Speaker 2: To put that in perspective, the Moon is about two 562 00:26:52,759 --> 00:26:56,319 hundred and forty thousand miles away. Our geosynchron satellites orbit 563 00:26:56,359 --> 00:26:57,799 at greater distances. 564 00:26:57,400 --> 00:26:59,920 Speaker 1: So it will be closer than many of our own satellites. 565 00:27:00,000 --> 00:27:02,960 Speaker 2: People in parts of Europe, Africa and Asia will actually 566 00:27:03,000 --> 00:27:04,640 be able to see it with the naked eye. It's 567 00:27:04,680 --> 00:27:06,039 a literal cosmic flyby. 568 00:27:06,240 --> 00:27:09,119 Speaker 1: It's the ultimate close call for a non impact scenario, 569 00:27:09,400 --> 00:27:11,319 and scientists are using it as a test run. 570 00:27:11,480 --> 00:27:14,400 Speaker 2: They need to monitor any tiny subtle changes in its 571 00:27:14,480 --> 00:27:18,759 orbit caused by Earth's gravity that you're Kofski effect again, And. 572 00:27:18,640 --> 00:27:21,400 Speaker 1: What's the worst case future scenario that this flyby could 573 00:27:21,400 --> 00:27:21,799 set up? 574 00:27:21,960 --> 00:27:24,720 Speaker 2: A slight nudge could line apophys up precisely for what's 575 00:27:24,759 --> 00:27:28,079 called a keyhole, a tiny area of space that would 576 00:27:28,119 --> 00:27:29,799 guarantee an impact on a future. 577 00:27:29,559 --> 00:27:33,559 Speaker 1: Pass, specifically in twenty thirty six or twenty sixty nine. 578 00:27:33,920 --> 00:27:35,880 Speaker 2: So even though we're safe in twenty twenty nine, the 579 00:27:35,880 --> 00:27:38,759 future danger depends entirely on how our gravity affects it. 580 00:27:38,799 --> 00:27:41,960 Speaker 1: The cosmic neighborhood is perpetually busy. We even have objects 581 00:27:42,000 --> 00:27:44,000 that temporarily become our own mini moons. 582 00:27:44,160 --> 00:27:46,640 Speaker 2: Yes twenty twenty CD three is a perfect example, a 583 00:27:46,720 --> 00:27:49,680 tiny asteroid captured by Earth's gravity around twenty sixteen or 584 00:27:49,720 --> 00:27:50,480 twenty seventeen. 585 00:27:50,559 --> 00:27:52,839 Speaker 1: It orbited us for a while before escaping in May 586 00:27:52,880 --> 00:27:54,079 twenty twenty, and they'll. 587 00:27:53,920 --> 00:27:57,200 Speaker 2: Make another close pass in twenty forty four. These temporary 588 00:27:57,200 --> 00:28:00,000 satellites just show how easily small objects can get snare 589 00:28:00,160 --> 00:28:00,920 by our gravity. 590 00:28:01,039 --> 00:28:04,119 Speaker 1: And finally, the small frequent visitors that still pack a punch. 591 00:28:04,240 --> 00:28:07,279 Speaker 2: We have twenty ten RF twelve. It has thirteen upcoming 592 00:28:07,279 --> 00:28:10,480 close approaches until twenty ninety five. The final one will 593 00:28:10,480 --> 00:28:13,279 be at just forty seven thousand kilometers. 594 00:28:13,000 --> 00:28:14,559 Speaker 1: A fraction of the distance to the Moon. 595 00:28:14,880 --> 00:28:17,880 Speaker 2: It's small, only about seven meters, but if it hits, 596 00:28:18,400 --> 00:28:21,319 it's excected to cause an explosion, similar to the Cheliabinsk 597 00:28:21,359 --> 00:28:22,920 media event in twenty thirteen. 598 00:28:23,599 --> 00:28:27,359 Speaker 1: That blast shattered windows and injured over one thousand people 599 00:28:27,559 --> 00:28:28,519 just from the shockwave. 600 00:28:28,680 --> 00:28:31,279 Speaker 2: Small size does not equal harmlessness. 601 00:28:30,759 --> 00:28:33,799 Speaker 1: Exactly, And then you have other school bus size objects 602 00:28:33,839 --> 00:28:36,119 like two thousand and eight dB and twenty fourteen HB 603 00:28:36,200 --> 00:28:40,240 one seventy seven, both with multiple close approaches forecasted. 604 00:28:40,480 --> 00:28:43,359 Speaker 2: The sources make it clear the close calls are frequent, 605 00:28:43,680 --> 00:28:47,519 the destructive power is high, and the need for constant monitoring, 606 00:28:47,759 --> 00:28:51,440 even for the smallest objects is critical because those are 607 00:28:51,440 --> 00:28:52,839 the ones we're most likely to miss. 608 00:28:53,000 --> 00:28:55,799 Speaker 1: It is truly stunning to synthesize all this data into 609 00:28:55,839 --> 00:28:58,920 one narrative. We've explored this profound duality. 610 00:28:59,160 --> 00:29:03,599 Speaker 2: They air timecap carrying the deepest secrets of creation, amino acids, 611 00:29:03,720 --> 00:29:05,839 alien water, ancient stellar. 612 00:29:05,559 --> 00:29:08,400 Speaker 1: Dust, defining the origins of our planet, and maybe even 613 00:29:08,440 --> 00:29:11,279 life itself. Yet there are also these ticking time bombs 614 00:29:11,279 --> 00:29:14,400 carrying the scars of angel disasters that could bring catastrophe 615 00:29:14,400 --> 00:29:14,759 to us. 616 00:29:14,799 --> 00:29:17,519 Speaker 2: The very objects that may have seated life are also 617 00:29:17,559 --> 00:29:18,759 the greatest threat to it. 618 00:29:18,799 --> 00:29:23,119 Speaker 1: The data compels us to confront several difficult realities. First, 619 00:29:23,559 --> 00:29:26,720 cosmic violence isn't just a historical event, it's ongoing. 620 00:29:27,119 --> 00:29:31,200 Speaker 2: Second, life isn't necessarily a rare miracle, but maybe a 621 00:29:31,240 --> 00:29:34,519 cosmic inevitability driven by this pervasive chemistry. 622 00:29:34,680 --> 00:29:37,920 Speaker 1: And third, the close calls are frequent and the rubble 623 00:29:37,960 --> 00:29:40,640 pile nature of these threats complicates everything. 624 00:29:41,039 --> 00:29:44,240 Speaker 2: The knowledge we gain from Benu and Riugu, the knowledge 625 00:29:44,240 --> 00:29:47,480 that our oceans might be an alien cocktail, that a 626 00:29:47,519 --> 00:29:51,200 golden gate bridge sized rock will pass closer than the 627 00:29:51,240 --> 00:29:52,680 Moon in just a few years. 628 00:29:52,799 --> 00:29:57,720 Speaker 1: That knowledge demands an immediate, focused and persistent response. These 629 00:29:57,759 --> 00:30:00,880 asteroids force us to look outward and realize how fragile 630 00:30:00,880 --> 00:30:01,599 our position is. 631 00:30:01,920 --> 00:30:04,839 Speaker 2: It moves the discussion of planetary defense from science fiction 632 00:30:04,920 --> 00:30:08,680 to critical infrastructure necessary not just for our safety, but 633 00:30:08,720 --> 00:30:11,359 for understanding the fundamental processes of the universe. 634 00:30:11,759 --> 00:30:14,119 Speaker 1: So we'll leave you with this final thought. Considering these 635 00:30:14,200 --> 00:30:17,279 terrifying discoveries, the fact that life's ingredients are scattered everywhere, 636 00:30:17,359 --> 00:30:20,519 yet civilization could be undone by a shifting orbit. 637 00:30:20,799 --> 00:30:23,039 Speaker 2: What stands out to you is the single most compelling 638 00:30:23,079 --> 00:30:26,559 reason for humanity to invest heavily in planetary defense? And 639 00:30:26,599 --> 00:30:29,440 what single question about the origin of life do these 640 00:30:29,480 --> 00:30:31,720 pervasive cosmic ingredients raise for you? 641 00:30:31,920 --> 00:30:33,200 Speaker 1: We really want to know what you think.