1 00:00:00,000 --> 00:00:07,880 Imagine you're an astronaut, the first human to step foot on a newly discovered plant. 2 00:00:07,880 --> 00:00:12,440 You gaze up the alien sky, two moons hanging low on the horizon. 3 00:00:12,440 --> 00:00:17,000 You reach out to touch a strange bioluminescent plant and then you hear it. 4 00:00:17,000 --> 00:00:23,480 A low hum, a rhythmic pulse, a melody unlike anything you've ever heard on Earth. 5 00:00:23,480 --> 00:00:26,760 That's the kind of experience we're exploring today, the sounds of the universe. 6 00:00:26,760 --> 00:00:30,240 It's a captivating thought, isn't it, that even in the vast emptiness of space there's 7 00:00:30,240 --> 00:00:32,420 a symphony of sound waiting to be heard. 8 00:00:32,420 --> 00:00:36,000 And what's fascinating is that we don't need to travel to distant planets to experience 9 00:00:36,000 --> 00:00:37,000 this. 10 00:00:37,000 --> 00:00:39,360 Even our own planet has a unique sonic signature. 11 00:00:39,360 --> 00:00:42,480 Welcome to Cosmos in a Pond, the Space and Astronomy series. 12 00:00:42,480 --> 00:00:44,960 Please like, comment, share, and subscribe. 13 00:00:44,960 --> 00:00:48,240 That's right, we often think of space as silent, but it's anything but. 14 00:00:48,240 --> 00:00:49,440 So let's start with Earth. 15 00:00:49,440 --> 00:00:52,360 If we could listen to our planets from space, what would we hear? 16 00:00:52,360 --> 00:00:58,160 Well, one of the most prominent sounds would be the eerie chorus of what are known as Whistler 17 00:00:58,160 --> 00:00:59,600 Mode waves. 18 00:00:59,600 --> 00:01:02,200 These are electromagnetic waves generated by lightning strikes. 19 00:01:02,200 --> 00:01:05,100 Wait, so lightning on Earth creates sound in space. 20 00:01:05,100 --> 00:01:06,100 How does that work? 21 00:01:06,100 --> 00:01:08,320 It's a bit like dropping a pebble in a pond. 22 00:01:08,320 --> 00:01:13,440 The lightning strike creates a disturbance, a ripple of energy that travels outwards. 23 00:01:13,440 --> 00:01:17,840 But instead of water, these ripples travel through the plasma surrounding our planet. 24 00:01:17,840 --> 00:01:18,840 Plasma. 25 00:01:18,840 --> 00:01:20,360 I remember learning about that in science class. 26 00:01:20,360 --> 00:01:22,040 I need a refresher. 27 00:01:22,040 --> 00:01:25,780 What exactly is plasma, and how does it carry sound? 28 00:01:25,780 --> 00:01:26,880 Think of it this way. 29 00:01:26,880 --> 00:01:31,780 You have solid ice, then liquid water, then gaseous steam. 30 00:01:31,780 --> 00:01:36,900 Plasma is like the next level of matter where atoms are stripped of some of their electrons. 31 00:01:36,900 --> 00:01:41,880 This creates a sea of charged particles that can be influenced by electric and magnetic 32 00:01:41,880 --> 00:01:45,040 fields generating waves that we can translate into sound. 33 00:01:45,040 --> 00:01:46,480 Okay, that makes sense. 34 00:01:46,480 --> 00:01:50,200 So the lightning strikes create these waves in the plasma surrounding Earth, and that's 35 00:01:50,200 --> 00:01:52,160 what creates the whistler sound. 36 00:01:52,160 --> 00:01:53,160 Precisely. 37 00:01:53,160 --> 00:01:56,680 And these whistlers aren't just random noise, they actually reveal a lot about the structure 38 00:01:56,680 --> 00:02:01,640 and dynamics of Earth's magnetic field, which acts as a shield protecting us from harmful 39 00:02:01,640 --> 00:02:02,720 solar radiation. 40 00:02:02,720 --> 00:02:06,520 So by listening to these sounds, we can learn more about how our planet interacts with the 41 00:02:06,520 --> 00:02:07,520 space environment. 42 00:02:07,520 --> 00:02:08,520 That's pretty cool. 43 00:02:08,520 --> 00:02:11,480 Are there any other Earth sounds we can pick up from space? 44 00:02:11,480 --> 00:02:12,480 Oh, definitely. 45 00:02:12,480 --> 00:02:17,800 There are also chorus waves, which sound like a chorus of birds chirping, and hiss waves, 46 00:02:17,800 --> 00:02:20,000 which resemble radio static. 47 00:02:20,000 --> 00:02:24,680 These are caused by interactions between charged particles from the Sun and Earth's magnetosphere. 48 00:02:24,680 --> 00:02:27,560 So our planet is quite the noisy neighbor in space. 49 00:02:27,560 --> 00:02:32,560 It is, and it's a reminder that even seemingly empty space is teeming with activity, with 50 00:02:32,560 --> 00:02:35,320 energy constantly flowing and transforming. 51 00:02:35,320 --> 00:02:39,360 Now I'm curious about the big guy in our solar system. 52 00:02:39,360 --> 00:02:40,360 The Sun. 53 00:02:40,360 --> 00:02:45,620 I know it's a giant ball of burning gas, but can it make sounds too? 54 00:02:45,620 --> 00:02:46,920 It certainly can. 55 00:02:46,920 --> 00:02:51,400 Imagine the roar of a nuclear furnace amplified to an unimaginable scale. 56 00:02:51,400 --> 00:02:53,160 That's the kind of sound the Sun produces. 57 00:02:53,160 --> 00:02:57,440 Well, but if it's gas, how does it vibrate to create sound? 58 00:02:57,440 --> 00:03:00,960 Remember, sound is just vibration traveling through a medium. 59 00:03:00,960 --> 00:03:05,240 And the Sun's outer atmosphere, the corona, is actually made of superheated plasma, just 60 00:03:05,240 --> 00:03:06,840 like the plasma surrounding Earth. 61 00:03:06,840 --> 00:03:11,560 This plasma is constantly churning and swirling, creating waves that we can detect and translate 62 00:03:11,560 --> 00:03:12,560 into sound. 63 00:03:12,560 --> 00:03:14,760 So we can actually listen to the Sun's plasma waves. 64 00:03:14,760 --> 00:03:16,240 What do they sound like? 65 00:03:16,240 --> 00:03:18,560 It's a truly awe-inspiring sound. 66 00:03:18,560 --> 00:03:24,040 A symphony of crackling energy, deep rumbles, and even explosive bursts caused by solar 67 00:03:24,040 --> 00:03:25,040 flares. 68 00:03:25,040 --> 00:03:29,280 It's a reminder of the immense power of our star and the constant dance of energy happening 69 00:03:29,280 --> 00:03:30,280 at its core. 70 00:03:30,280 --> 00:03:31,480 This is blowing my mind. 71 00:03:31,480 --> 00:03:33,760 It really changes the way I picture the Sun. 72 00:03:33,760 --> 00:03:35,920 It's not just a silent ball of light. 73 00:03:35,920 --> 00:03:40,520 It's this dynamic and powerful being with its own unique voice. 74 00:03:40,520 --> 00:03:41,660 Exactly. 75 00:03:41,660 --> 00:03:45,960 And what's even more remarkable is that we can use these sounds to study the Sun's activity, 76 00:03:45,960 --> 00:03:50,320 to understand how solar flares erupt, and even to predict space weather that could affect 77 00:03:50,320 --> 00:03:51,320 Earth. 78 00:03:51,320 --> 00:03:55,240 So, by listening to the Sun, we can learn more about how it impacts our own planet. 79 00:03:55,240 --> 00:03:56,240 Absolutely. 80 00:03:56,240 --> 00:03:59,920 And we can also gain insights into the fundamental processes happening within stars. 81 00:03:59,920 --> 00:04:02,720 Not just our own Sun, but stars throughout the universe. 82 00:04:02,720 --> 00:04:03,720 Wow. 83 00:04:03,720 --> 00:04:04,720 This is incredible. 84 00:04:04,720 --> 00:04:09,240 We've gone from eerie whispers around Earth to the thunderous roar of the Sun. 85 00:04:09,240 --> 00:04:13,200 And I bet there are even more amazing sounds waiting for us as we venture further out into 86 00:04:13,200 --> 00:04:14,200 the cosmos. 87 00:04:14,200 --> 00:04:15,200 You're absolutely right. 88 00:04:15,200 --> 00:04:20,280 Next, we'll journey beyond our solar system to the strange sounds of distant planets and 89 00:04:20,280 --> 00:04:22,160 the rhythmic beats of pulsars. 90 00:04:22,160 --> 00:04:23,160 I can't wait. 91 00:04:23,160 --> 00:04:24,160 This is getting really exciting. 92 00:04:24,160 --> 00:04:28,080 Each planet in our solar system, you know, with its unique composition and atmosphere, 93 00:04:28,080 --> 00:04:30,240 creates a distinct soundscape. 94 00:04:30,240 --> 00:04:33,000 Let's start with a place that's always intrigued me, Venus. 95 00:04:33,000 --> 00:04:34,520 Ah, Venus. 96 00:04:34,520 --> 00:04:37,760 Our sister planet, shrouded in thick clouds. 97 00:04:37,760 --> 00:04:41,280 I've always pictured it as a scorching hot volcanic world. 98 00:04:41,280 --> 00:04:43,880 But what would it sound like to stand on its surface? 99 00:04:43,880 --> 00:04:47,880 Well, the first thing you'd notice is how loud everything would be. 100 00:04:47,880 --> 00:04:53,040 Venus's atmosphere is incredibly dense, about 90 times denser than Earth's. 101 00:04:53,040 --> 00:04:57,560 This means that sound waves travel much faster and lose less energy as they propagate. 102 00:04:57,560 --> 00:05:01,440 So every sound would be amplified, like turning up the volume on a speaker. 103 00:05:01,440 --> 00:05:02,440 Precisely. 104 00:05:02,440 --> 00:05:03,440 But it wouldn't just be louder. 105 00:05:03,440 --> 00:05:05,320 The pitch would also be affected. 106 00:05:05,320 --> 00:05:10,400 The higher density of Venus's atmosphere would cause sounds to have a lower pitch, 107 00:05:10,400 --> 00:05:12,040 making them deeper and more resonant. 108 00:05:12,040 --> 00:05:13,040 Interesting. 109 00:05:13,040 --> 00:05:17,680 I can imagine a deep, booming voice echoing across the Venusian landscape. 110 00:05:17,680 --> 00:05:21,920 But I also remember reading that Venus's atmosphere is mostly carbon dioxide. 111 00:05:21,920 --> 00:05:23,640 Wouldn't that affect the sound as well? 112 00:05:23,640 --> 00:05:24,640 You're right. 113 00:05:24,640 --> 00:05:29,320 Carbon dioxide is a heavier molecule than the nitrogen and oxygen that dominate Earth's 114 00:05:29,320 --> 00:05:30,320 atmosphere. 115 00:05:30,320 --> 00:05:35,160 This means that higher-pitched sounds would be absorbed more readily, further contributing 116 00:05:35,160 --> 00:05:38,880 to the deep, base-heavy soundscape. 117 00:05:38,880 --> 00:05:43,160 So listening to Venus would be like experiencing the world through a subwoofer. 118 00:05:43,160 --> 00:05:46,500 It's almost like each planet has its own musical genre. 119 00:05:46,500 --> 00:05:47,600 What about Mars? 120 00:05:47,600 --> 00:05:49,840 What would it sound like to stand on the red planet? 121 00:05:49,840 --> 00:05:52,920 Mars on the other hand is almost the opposite of Venus. 122 00:05:52,920 --> 00:05:56,600 Its atmosphere is incredibly thin, about 100 times thinner than Earth's. 123 00:05:56,600 --> 00:06:00,720 This means sounds would be significantly fainter and travel much slower. 124 00:06:00,720 --> 00:06:03,040 So it would be a world of whispers and echoes. 125 00:06:03,040 --> 00:06:04,040 Exactly. 126 00:06:04,040 --> 00:06:07,880 And because Mars's atmosphere is also mostly carbon dioxide, those faint sounds would be 127 00:06:07,880 --> 00:06:11,680 dominated by low-frequency rumbles, almost like a distant heartbeat. 128 00:06:11,680 --> 00:06:16,880 It's fascinating how these seemingly simple facts about atmospheric composition can create 129 00:06:16,880 --> 00:06:19,660 such vastly different sound experiences. 130 00:06:19,660 --> 00:06:23,320 It really highlights the interplay between physics and perception. 131 00:06:23,320 --> 00:06:27,760 Imagine the challenges faced by future explorers trying to communicate in such alien environments. 132 00:06:27,760 --> 00:06:29,560 I hadn't even thought of that. 133 00:06:29,560 --> 00:06:31,880 It would definitely make things more complicated. 134 00:06:31,880 --> 00:06:34,880 Now I'm curious about the gas giants. 135 00:06:34,880 --> 00:06:37,760 Jupiter and Saturn. 136 00:06:37,760 --> 00:06:39,960 Those planets are enormous. 137 00:06:39,960 --> 00:06:42,600 What kind of sonic mayhem do you think they create? 138 00:06:42,600 --> 00:06:46,600 Ah, the gas giants are a whole other category of soundscape. 139 00:06:46,600 --> 00:06:51,160 Jupiter for instance is known for its colossal storms, like the Great Red Spot, which has 140 00:06:51,160 --> 00:06:52,560 been raging for centuries. 141 00:06:52,560 --> 00:06:54,640 I've seen pictures of the Great Red Spot. 142 00:06:54,640 --> 00:06:58,520 It's this giant swirling vortex bigger than Earth. 143 00:06:58,520 --> 00:07:01,360 What kind of sound do you think a storm like that would produce? 144 00:07:01,360 --> 00:07:05,820 Imagine the most powerful hurricane you can think of, then multiply it by a thousand. 145 00:07:05,820 --> 00:07:10,480 The winds on Jupiter can reach speeds of over 400 miles per hour, generating intense pressure 146 00:07:10,480 --> 00:07:15,880 waves and shock waves that would create a cacophony of deep roars, hisses and whistles. 147 00:07:15,880 --> 00:07:17,040 That sounds absolutely terrifying. 148 00:07:17,040 --> 00:07:19,880 It's like standing inside a giant cosmic jet engine. 149 00:07:19,880 --> 00:07:20,880 And what about Saturn? 150 00:07:20,880 --> 00:07:22,640 Does it have similar soundscapes? 151 00:07:22,640 --> 00:07:25,440 Saturn sounds are equally impressive, but with a unique twist. 152 00:07:25,440 --> 00:07:26,680 Remember Saturn's rings? 153 00:07:26,680 --> 00:07:31,920 They're not just a beautiful visual spectacle, they also create a fascinating acoustic environment. 154 00:07:31,920 --> 00:07:33,840 Wait, the wings make noise. 155 00:07:33,840 --> 00:07:34,840 How is that possible? 156 00:07:34,840 --> 00:07:38,000 It's all about resonance and vibration. 157 00:07:38,000 --> 00:07:43,640 The particles in Saturn's rings, mostly ice and rock, constantly collide with each other. 158 00:07:43,640 --> 00:07:47,640 This creates a subtle but persistent hum that can be detected by spacecraft passing through 159 00:07:47,640 --> 00:07:49,120 the ring plane. 160 00:07:49,120 --> 00:07:51,960 So the rings are like a giant cosmic wind chime. 161 00:07:51,960 --> 00:07:54,240 That's an image I won't soon forget. 162 00:07:54,240 --> 00:08:00,080 It's incredible how each planet has its own unique acoustic signature shaped by its atmosphere, 163 00:08:00,080 --> 00:08:02,440 its weather patterns, and even its rings. 164 00:08:02,440 --> 00:08:05,740 It really shows how diverse and complex our solar system is. 165 00:08:05,740 --> 00:08:07,080 And we've only scratched the surface. 166 00:08:07,080 --> 00:08:11,560 There's a whole universe of sound waiting to be discovered beyond our planetary neighborhood. 167 00:08:11,560 --> 00:08:16,680 And speaking of cosmic dances, I'm curious about objects beyond our solar system. 168 00:08:16,680 --> 00:08:18,980 What about the sounds of distant stars and galaxies? 169 00:08:18,980 --> 00:08:20,160 Can we even hear those? 170 00:08:20,160 --> 00:08:24,880 We can, and some of the most fascinating sounds come from a type of star called a pulsar. 171 00:08:24,880 --> 00:08:29,200 These are incredibly dense, rapidly spinning remnants of collapsed stars. 172 00:08:29,200 --> 00:08:30,500 I've heard of pulsars. 173 00:08:30,500 --> 00:08:32,360 They're like cosmic lighthouses, right? 174 00:08:32,360 --> 00:08:35,320 Emitting beams of radiation that sweep across space. 175 00:08:35,320 --> 00:08:36,320 Exactly. 176 00:08:36,320 --> 00:08:41,560 And when those beams sweep past Earth, we detect them as pulses of radio waves. 177 00:08:41,560 --> 00:08:44,120 Now here's where it gets really interesting. 178 00:08:44,120 --> 00:08:47,880 Scientists can take those radio pulses and convert them into sound. 179 00:08:47,880 --> 00:08:51,520 Wait, so we can listen to the rhythm of a spinning dead star? 180 00:08:51,520 --> 00:08:52,520 That's incredible. 181 00:08:52,520 --> 00:08:53,520 What does it sound like? 182 00:08:53,520 --> 00:08:54,740 It depends on the pulsar. 183 00:08:54,740 --> 00:08:59,720 Some pulsars spin incredibly fast, hundreds of times per second, creating a high-pitched, 184 00:08:59,720 --> 00:09:02,080 whirring sound almost like a cosmic drill. 185 00:09:02,080 --> 00:09:05,000 Wow, I can't even imagine a star spinning that fast. 186 00:09:05,000 --> 00:09:06,640 Are there slower pulsars too? 187 00:09:06,640 --> 00:09:07,800 Oh yes. 188 00:09:07,800 --> 00:09:11,480 Some pulsars rotate more slowly, maybe once every few seconds. 189 00:09:11,480 --> 00:09:15,400 These create a deep, rhythmic pulse, like a cosmic heartbeat. 190 00:09:15,400 --> 00:09:19,280 It's amazing to think that these seemingly silent objects are actually producing such 191 00:09:19,280 --> 00:09:21,200 a wide range of sounds. 192 00:09:21,200 --> 00:09:24,320 It's like they're broadcasting their own unique code across the universe. 193 00:09:24,320 --> 00:09:28,540 And by studying these sounds, these pulsar songs, we can learn about the physics of these 194 00:09:28,540 --> 00:09:32,520 extreme objects, how they formed, and how they evolve over time. 195 00:09:32,520 --> 00:09:34,320 So it's not just about the sound itself. 196 00:09:34,320 --> 00:09:37,600 It's about the information it carries, the secrets it reveals. 197 00:09:37,600 --> 00:09:42,520 Now I have to ask about the ultimate cosmic mystery. 198 00:09:42,520 --> 00:09:43,560 Black holes. 199 00:09:43,560 --> 00:09:45,420 Can we hear the sounds of black holes? 200 00:09:45,420 --> 00:09:49,080 That's a great question, and it leads us to one of the most groundbreaking discoveries 201 00:09:49,080 --> 00:09:52,060 in modern astronomy, gravitational waves. 202 00:09:52,060 --> 00:09:56,480 I've heard of gravitational waves, but I'll admit I don't fully understand them. 203 00:09:56,480 --> 00:10:00,920 How can we hear something that's essentially a ripple in space-time? 204 00:10:00,920 --> 00:10:05,920 It's a bit mind-bending, but essentially when massive objects like black holes collide, 205 00:10:05,920 --> 00:10:09,040 they create these ripples in the fabric of space-time. 206 00:10:09,040 --> 00:10:13,240 These ripples travel outward at the speed of light, carrying energy and information 207 00:10:13,240 --> 00:10:14,800 about the event that created them. 208 00:10:14,800 --> 00:10:16,160 Yeah, I'm starting to fall. 209 00:10:16,160 --> 00:10:18,780 But how do we detect these ripples? 210 00:10:18,780 --> 00:10:20,400 And how do they translate into sound? 211 00:10:20,400 --> 00:10:25,320 We have incredible instruments like LEGO, the laser interferometer, gravitational wave 212 00:10:25,320 --> 00:10:31,040 observatory, which can detect these incredibly subtle distortions in space-time. 213 00:10:31,040 --> 00:10:35,600 And when those signals are processed and converted into sound, they create a distinctive chirp 214 00:10:35,600 --> 00:10:36,600 sound. 215 00:10:36,600 --> 00:10:37,880 A chirp. 216 00:10:37,880 --> 00:10:42,680 So the collision of two black holes, these incredibly massive and powerful objects, sounds 217 00:10:42,680 --> 00:10:44,680 like a bird. 218 00:10:44,680 --> 00:10:49,440 It's not exactly a bird song, but it does have a rising pitch that resembles a chirp. 219 00:10:49,440 --> 00:10:54,880 It's a haunting and awe-inspiring sound, a testament to the immense power of these cosmic 220 00:10:54,880 --> 00:10:55,880 events. 221 00:10:55,880 --> 00:10:56,880 That's just incredible. 222 00:10:56,880 --> 00:11:00,440 It's like listening to the universe itself, to the echoes of these cataclysmic events 223 00:11:00,440 --> 00:11:02,100 that shape the cosmos. 224 00:11:02,100 --> 00:11:04,160 And it makes me wonder, what else is out there? 225 00:11:04,160 --> 00:11:06,280 What other sounds are waiting to be discovered? 226 00:11:06,280 --> 00:11:08,080 That's the beauty of science and exploration. 227 00:11:08,080 --> 00:11:11,240 There's always more to learn, more to hear, more to discover. 228 00:11:11,240 --> 00:11:16,240 And with every new instrument, every new technique, we're opening our ears to a universe that's 229 00:11:16,240 --> 00:11:19,600 far richer and more complex than we ever imagined. 230 00:11:19,600 --> 00:11:20,680 Well said. 231 00:11:20,680 --> 00:11:22,440 This whole deep dive has been a revelation. 232 00:11:22,440 --> 00:11:24,920 It's changed the way I think about space forever. 233 00:11:24,920 --> 00:11:26,680 It's not just a silent void. 234 00:11:26,680 --> 00:11:29,280 It's a vibrant and dynamic symphony of sound. 235 00:11:29,280 --> 00:11:30,600 I'm glad to hear that. 236 00:11:30,600 --> 00:11:33,000 That's the power of curiosity and imagination. 237 00:11:33,000 --> 00:11:36,560 Keep looking up, keep listening, and you'll never cease to be amazed by the wonders of 238 00:11:36,560 --> 00:11:37,640 the universe. 239 00:11:37,640 --> 00:11:41,640 On that note, I want to thank you, our listeners, for joining us on this sonic adventure through 240 00:11:41,640 --> 00:11:42,720 the cosmos. 241 00:11:42,720 --> 00:11:47,100 And don't forget to follow and subscribe to Cosmos in a Pod and our YouTube channel for 242 00:11:47,100 --> 00:11:49,240 more explorations of the universe. 243 00:11:49,240 --> 00:11:52,920 Until next time, keep exploring and keep listening. 244 00:11:52,920 --> 00:12:19,560 The universe is full of wonders waiting to be heard.