1 00:00:00,000 --> 00:00:05,140 Picture this, you're gazing up at the night sky and suddenly, bam, a star explodes. 2 00:00:05,140 --> 00:00:09,600 A star explodes with a brilliance that could rival an entire galaxy. 3 00:00:09,600 --> 00:00:10,600 It's incredible. 4 00:00:10,600 --> 00:00:15,700 Yeah, and this actually happened back in 1885 when astronomers witnessed such an event in 5 00:00:15,700 --> 00:00:18,100 what they thought was just a fuzzy patch of light. 6 00:00:18,100 --> 00:00:23,140 Turns out they were looking at something much grander, the Andromeda Galaxy, our closest 7 00:00:23,140 --> 00:00:24,940 galactic neighbor. 8 00:00:24,940 --> 00:00:29,980 It's amazing to think that something so seemingly small could actually be an entire galaxy. 9 00:00:29,980 --> 00:00:31,140 It really is. 10 00:00:31,140 --> 00:00:35,180 Welcome to Cosmos and Applaud's Space and Astronomy series, where we dive deep into 11 00:00:35,180 --> 00:00:39,100 these mind-boggling moments in space and explore the wonders they reveal. 12 00:00:39,100 --> 00:00:43,220 Today, we're taking a deep dive into the Andromeda Galaxy itself. 13 00:00:43,220 --> 00:00:47,380 A swirling mass of a trillion stars, dust, and mysteries. 14 00:00:47,380 --> 00:00:50,300 And it lies just 2.5 million light-years away. 15 00:00:50,300 --> 00:00:52,820 That's mind-bogglingly close in the grand scheme of the universe. 16 00:00:52,820 --> 00:00:53,820 It really is. 17 00:00:53,820 --> 00:00:55,880 It's a galaxy that's teeming with activity. 18 00:00:55,880 --> 00:00:56,880 What kind of activity? 19 00:00:56,880 --> 00:01:01,340 You've got stellar nurseries where new stars are constantly being born. 20 00:01:01,340 --> 00:01:03,700 So the galaxy is alive with creation. 21 00:01:03,700 --> 00:01:04,700 Exactly. 22 00:01:04,700 --> 00:01:07,460 And then you have black holes lurking in the shadows. 23 00:01:07,460 --> 00:01:12,460 It's amazing how these incredible forces of creation and destruction exist side by 24 00:01:12,460 --> 00:01:13,460 side in the universe. 25 00:01:13,460 --> 00:01:14,460 It is. 26 00:01:14,460 --> 00:01:19,060 And we even see hints of past galactic collisions that have shaped Andromeda's evolution. 27 00:01:19,060 --> 00:01:21,460 So it's got a bit of a history of this Andromeda Galaxy. 28 00:01:21,460 --> 00:01:22,620 It's been through some stuff. 29 00:01:22,620 --> 00:01:24,060 It definitely has. 30 00:01:24,060 --> 00:01:25,060 Let's unpack this. 31 00:01:25,060 --> 00:01:30,460 So starting with that 1885 supernova sighting that we talked about at the top of the show, 32 00:01:30,460 --> 00:01:34,060 that must have caused quite a stir in the astronomy world. 33 00:01:34,060 --> 00:01:35,060 Oh, absolutely. 34 00:01:35,060 --> 00:01:40,260 Back then, astronomers were still debating whether those fuzzy patches of light in the 35 00:01:40,260 --> 00:01:45,420 sky, those nebulae, were just within our own galaxy or if they were something else entirely. 36 00:01:45,420 --> 00:01:49,100 And the technology at the time, was that even good enough to tell the difference? 37 00:01:49,100 --> 00:01:50,100 It wasn't. 38 00:01:50,100 --> 00:01:52,400 They just didn't have the tools to give them a definitive answer. 39 00:01:52,400 --> 00:01:54,380 So then this supernova happens. 40 00:01:54,380 --> 00:01:56,100 How did that change things? 41 00:01:56,100 --> 00:01:57,420 Well, imagine this. 42 00:01:57,420 --> 00:02:02,740 They observed this unbelievably bright explosion in what they thought was just a nebula. 43 00:02:02,740 --> 00:02:04,940 Yeah, that would raise some questions for sure. 44 00:02:04,940 --> 00:02:05,940 Right. 45 00:02:05,940 --> 00:02:10,220 And the sheer power of this event suggested that it had to be much farther away than any 46 00:02:10,220 --> 00:02:12,060 known nebula in the Milky Way. 47 00:02:12,060 --> 00:02:13,100 So it's like, hold on a second. 48 00:02:13,100 --> 00:02:15,580 This thing's way too bright to be just down the street. 49 00:02:15,580 --> 00:02:16,580 Exactly. 50 00:02:16,580 --> 00:02:17,580 It sparked a ton of curiosity. 51 00:02:17,580 --> 00:02:21,420 It really did and led to, well, decades of research, to be honest. 52 00:02:21,420 --> 00:02:22,580 And then what happened? 53 00:02:22,580 --> 00:02:27,740 It wasn't until the 1920s that astronomer Edwin Hubble used these more powerful telescopes 54 00:02:27,740 --> 00:02:33,180 and he was able to confirm that Andromeda was indeed a separate galaxy, vastly larger 55 00:02:33,180 --> 00:02:35,620 and more distant than anyone had ever imagined. 56 00:02:35,620 --> 00:02:36,820 Hubble, what a legend. 57 00:02:36,820 --> 00:02:39,300 So that's when the universe suddenly got a whole lot bigger. 58 00:02:39,300 --> 00:02:40,300 It did. 59 00:02:40,300 --> 00:02:41,300 It really did. 60 00:02:41,300 --> 00:02:44,020 So now we know that Andromeda is its own galaxy. 61 00:02:44,020 --> 00:02:45,020 What's it like? 62 00:02:45,020 --> 00:02:47,220 Well, imagine a majestic spiral. 63 00:02:47,220 --> 00:02:48,220 Okay. 64 00:02:48,220 --> 00:02:54,620 It's a swirling disk of stars, gas and dust stretching over 150,000 light years across. 65 00:02:54,620 --> 00:02:55,900 Wow, that's huge. 66 00:02:55,900 --> 00:02:56,900 It really is. 67 00:02:56,900 --> 00:02:58,860 And it's similar in structure to our own Milky Way. 68 00:02:58,860 --> 00:03:00,920 Oh, so it's like a sibling galaxy. 69 00:03:00,920 --> 00:03:04,060 You could say that, but with some key differences. 70 00:03:04,060 --> 00:03:05,060 Like what? 71 00:03:05,060 --> 00:03:08,700 For example, the gaps between its spiral arms are much wider. 72 00:03:08,700 --> 00:03:09,700 Wider gaps. 73 00:03:09,700 --> 00:03:10,700 Why is that? 74 00:03:10,700 --> 00:03:14,460 It's still a bit of a mystery, to be honest, but it could be due to past interactions with 75 00:03:14,460 --> 00:03:15,800 other galaxies. 76 00:03:15,800 --> 00:03:17,500 So Andromeda has a history, eh? 77 00:03:17,500 --> 00:03:20,660 It's been getting up to some mischief out there in the universe. 78 00:03:20,660 --> 00:03:21,660 Definitely. 79 00:03:21,660 --> 00:03:22,660 And you know what's really interesting? 80 00:03:22,660 --> 00:03:26,220 One of the pieces of evidence that pints to this, it's double nucleus. 81 00:03:26,220 --> 00:03:27,220 Double nucleus. 82 00:03:27,220 --> 00:03:28,220 What's that? 83 00:03:28,220 --> 00:03:33,860 At the heart of Andromeda, we see not one, but two bright regions, each just teeming 84 00:03:33,860 --> 00:03:35,500 with stars and activity. 85 00:03:35,500 --> 00:03:36,580 Two nuclei. 86 00:03:36,580 --> 00:03:37,580 That's unusual, isn't it? 87 00:03:37,580 --> 00:03:38,580 What's going on there? 88 00:03:38,580 --> 00:03:40,120 Well, that's the question, isn't it? 89 00:03:40,120 --> 00:03:44,780 One theory is that Andromeda actually merged with another galaxy in the very distant past. 90 00:03:44,780 --> 00:03:45,780 Okay. 91 00:03:45,780 --> 00:03:46,780 And so what happened? 92 00:03:46,780 --> 00:03:52,060 The core of that swallowed up galaxy is now nestled right alongside Andromeda's own core. 93 00:03:52,060 --> 00:03:55,380 So it's like a galactic souvenir of its turbulent past. 94 00:03:55,380 --> 00:03:56,380 Exactly. 95 00:03:56,380 --> 00:03:57,380 That's so cool. 96 00:03:57,380 --> 00:03:58,620 But there's another theory as well. 97 00:03:58,620 --> 00:03:59,620 What's that? 98 00:03:59,620 --> 00:04:03,060 That proposes that it's not actually two separate nuclei. 99 00:04:03,060 --> 00:04:04,540 Okay, but what is it then? 100 00:04:04,540 --> 00:04:07,140 But instead, a really dense band of dust. 101 00:04:07,140 --> 00:04:08,140 Okay. 102 00:04:08,140 --> 00:04:12,540 That's actually obscuring part of the central region and creating this illusion of two distinct 103 00:04:12,540 --> 00:04:13,540 cores. 104 00:04:13,540 --> 00:04:16,140 So it's a cosmic game of hide and seek. 105 00:04:16,140 --> 00:04:17,500 You could say that, yes. 106 00:04:17,500 --> 00:04:20,460 How do scientists hope to figure out which theory is correct? 107 00:04:20,460 --> 00:04:25,020 Well, they're using some pretty advanced telescopes, let me tell you, to study the 108 00:04:25,020 --> 00:04:28,620 motions of the stars and gas in that central region. 109 00:04:28,620 --> 00:04:30,420 And what are they hoping to find? 110 00:04:30,420 --> 00:04:35,500 By mapping those movements, they hope to get a clearer picture of what's really going on 111 00:04:35,500 --> 00:04:37,420 at Andromeda's core. 112 00:04:37,420 --> 00:04:41,020 So it's like they're trying to see through the cosmic dust and get to the bottom of this 113 00:04:41,020 --> 00:04:42,020 mystery. 114 00:04:42,020 --> 00:04:43,020 Exactly. 115 00:04:43,020 --> 00:04:44,020 That's what they're trying to do. 116 00:04:44,020 --> 00:04:47,980 And then Andromeda has some pretty incredible stars within it, stars living out their lives 117 00:04:47,980 --> 00:04:50,180 in some pretty spectacular ways. 118 00:04:50,180 --> 00:04:51,180 Absolutely. 119 00:04:51,180 --> 00:04:57,020 There are stellar nurseries, these vast clouds of gas and dust where new stars are constantly 120 00:04:57,020 --> 00:04:58,020 being born. 121 00:04:58,020 --> 00:05:02,820 It's amazing how these cosmic nurseries are constantly churning out new stars, new possibilities. 122 00:05:02,820 --> 00:05:03,900 It really is. 123 00:05:03,900 --> 00:05:05,780 And then you've got stars like A.E. Andromeda. 124 00:05:05,780 --> 00:05:07,340 Okay, A.E. Andromeda. 125 00:05:07,340 --> 00:05:08,340 Tell me about it. 126 00:05:08,340 --> 00:05:11,340 It's a massive blue giant star. 127 00:05:11,340 --> 00:05:12,340 A giant star. 128 00:05:12,340 --> 00:05:13,460 How giant are we talking? 129 00:05:13,460 --> 00:05:16,860 It's about 700,000 times brighter than our sun. 130 00:05:16,860 --> 00:05:18,660 Whoa, that's huge. 131 00:05:18,660 --> 00:05:22,300 And astronomers think it's on the verge of exploding as a supernova. 132 00:05:22,300 --> 00:05:25,860 Wait, so we might actually get to see a supernova in our lifetime. 133 00:05:25,860 --> 00:05:29,700 Well, they estimate it'll happen within the next million years. 134 00:05:29,700 --> 00:05:30,700 Oh, okay. 135 00:05:30,700 --> 00:05:35,060 So maybe not our lifetime, but still that's relatively soon in the grand scheme of things. 136 00:05:35,060 --> 00:05:36,060 It really is. 137 00:05:36,060 --> 00:05:40,820 And it's a reminder that galaxies are dynamic, ever-changing places. 138 00:05:40,820 --> 00:05:43,700 They're not just these static, beautiful pictures in the sky. 139 00:05:43,700 --> 00:05:45,580 It's like they have a life cycle. 140 00:05:45,580 --> 00:05:50,220 They're born, they evolve, and sometimes they even die. 141 00:05:50,220 --> 00:05:51,220 Exactly. 142 00:05:51,220 --> 00:05:54,100 And their death can be just as spectacular as their birth. 143 00:05:54,100 --> 00:05:55,100 Absolutely. 144 00:05:55,100 --> 00:05:59,580 Stars are born, they live out their lives, and they die in these spectacular explosions, 145 00:05:59,580 --> 00:06:06,220 scattering elements across space that eventually become part of new stars and planets. 146 00:06:06,220 --> 00:06:10,080 This cycle has been playing out for billions of years. 147 00:06:10,080 --> 00:06:13,620 That's just incredible, isn't it, this constant cycle of creation and destruction? 148 00:06:13,620 --> 00:06:14,620 It is. 149 00:06:14,620 --> 00:06:15,620 It really is. 150 00:06:15,620 --> 00:06:17,620 It makes you realize we're not just talking about static points of light here. 151 00:06:17,620 --> 00:06:22,380 We're talking about this living, breathing galaxy with a whole life cycle of its own. 152 00:06:22,380 --> 00:06:23,380 Exactly. 153 00:06:23,380 --> 00:06:25,580 And Andromeda's story is far from over. 154 00:06:25,580 --> 00:06:26,580 It's still unfolding. 155 00:06:26,580 --> 00:06:30,300 It has all these fascinating features that we're just beginning to understand. 156 00:06:30,300 --> 00:06:32,540 For example, there's NGC 206. 157 00:06:32,540 --> 00:06:34,020 NGC 206. 158 00:06:34,020 --> 00:06:35,020 Tell me more about that. 159 00:06:35,020 --> 00:06:38,740 It's this giant star cluster located near the edge of Andromeda's disk. 160 00:06:38,740 --> 00:06:41,340 Okay, and what's so special about this star cluster? 161 00:06:41,340 --> 00:06:47,020 It's so massive and so bright that you can actually see it from Earth with a decent amateur 162 00:06:47,020 --> 00:06:48,020 telescope. 163 00:06:48,020 --> 00:06:49,020 Wow, really? 164 00:06:49,020 --> 00:06:52,260 So even backyard astronomers can get a glimpse of this distant galaxy? 165 00:06:52,260 --> 00:06:53,260 That's right. 166 00:06:53,260 --> 00:06:54,940 It's truly an awe-inspiring sight. 167 00:06:54,940 --> 00:07:01,620 This cluster is packed with hundreds of massive, luminous stars, all shining brilliantly together. 168 00:07:01,620 --> 00:07:06,860 It's a testament to the sheer scale and power of star formation in a galaxy like Andromeda. 169 00:07:06,860 --> 00:07:09,020 It sounds like a real treat for anyone who can spot it. 170 00:07:09,020 --> 00:07:10,020 It is. 171 00:07:10,020 --> 00:07:13,920 And it's a reminder that even though Andromeda is millions of light-years away, we can still 172 00:07:13,920 --> 00:07:18,060 connect with its wonders through the power of observation and the beauty of the night 173 00:07:18,060 --> 00:07:19,060 sky. 174 00:07:19,060 --> 00:07:22,660 It's amazing how something so distant can still feel so close and personal. 175 00:07:22,660 --> 00:07:23,660 It is. 176 00:07:23,660 --> 00:07:24,660 It really is. 177 00:07:24,660 --> 00:07:27,860 So we've learned that Andromeda is more than just a collection of stars. 178 00:07:27,860 --> 00:07:34,140 It's this complex system with this rich history and a very dynamic future. 179 00:07:34,140 --> 00:07:37,860 And speaking of its future, you mentioned earlier that it's on a collision course with 180 00:07:37,860 --> 00:07:41,140 our own Milky Way galaxy, the big galactic encounter. 181 00:07:41,140 --> 00:07:43,960 I know we've talked about this before on the show, but for our listeners who might 182 00:07:43,960 --> 00:07:47,860 be new, can you remind us about the science behind this collision? 183 00:07:47,860 --> 00:07:49,940 And how can two galaxies even collide? 184 00:07:49,940 --> 00:07:52,300 Well, it all comes down to gravity. 185 00:07:52,300 --> 00:07:57,660 Both Andromeda and the Milky Way are hurtling towards each other at a speed of about 300 186 00:07:57,660 --> 00:07:59,100 kilometers per second. 187 00:07:59,100 --> 00:08:00,100 That's incredibly fast. 188 00:08:00,100 --> 00:08:01,220 It is. 189 00:08:01,220 --> 00:08:05,700 And over billions of years, that gravitational pull will bring them closer and closer until 190 00:08:05,700 --> 00:08:07,020 they eventually merge. 191 00:08:07,020 --> 00:08:09,020 So it's not like two cars crashing head on. 192 00:08:09,020 --> 00:08:11,100 It's more like a slow cosmic dance. 193 00:08:11,100 --> 00:08:12,100 Exactly. 194 00:08:12,100 --> 00:08:16,020 The galaxies will actually pass through each other, their stars and gas clouds interacting 195 00:08:16,020 --> 00:08:17,700 in complex ways. 196 00:08:17,700 --> 00:08:22,840 The gravitational forces will distort their shapes, flinging stars into new orbits, creating 197 00:08:22,840 --> 00:08:27,500 tidal tails of gas and dust and triggering bursts of new star formation. 198 00:08:27,500 --> 00:08:32,660 It's a process that will unfold over billions of years, gradually transforming both galaxies 199 00:08:32,660 --> 00:08:35,740 into a single larger elliptical galaxy. 200 00:08:35,740 --> 00:08:37,760 Wow, that's just mind blowing. 201 00:08:37,760 --> 00:08:41,800 And what about the supermassive black holes at the centers of each galaxy? 202 00:08:41,800 --> 00:08:42,800 What happens to them? 203 00:08:42,800 --> 00:08:45,140 They'll definitely get in on the action too. 204 00:08:45,140 --> 00:08:49,540 Over time, those black holes will spiral towards each other, eventually merging into an even 205 00:08:49,540 --> 00:08:53,840 more massive black hole at the center of that newly formed galaxy. 206 00:08:53,840 --> 00:08:57,100 So it's like a cosmic merger of epic proportions. 207 00:08:57,100 --> 00:08:59,300 What happens when these black holes finally merge? 208 00:08:59,300 --> 00:09:03,540 It's a process that releases enormous amounts of energy, potentially creating powerful jets 209 00:09:03,540 --> 00:09:06,380 of radiation that could be visible across the cosmos. 210 00:09:06,380 --> 00:09:09,640 It's incredible to think about the scale of these events. 211 00:09:09,640 --> 00:09:13,840 And it highlights how dynamic and ever-changing the universe truly is. 212 00:09:13,840 --> 00:09:18,820 Even galaxies, these seemingly permanent structures, can undergo these dramatic transformations. 213 00:09:18,820 --> 00:09:21,040 But what about us? 214 00:09:21,040 --> 00:09:25,000 What happens to Earth and our solar system during all of this? 215 00:09:25,000 --> 00:09:29,260 The good news is, the chances of our solar system directly colliding with another star 216 00:09:29,260 --> 00:09:31,940 system are incredibly slim. 217 00:09:31,940 --> 00:09:37,260 The vast distances between stars within a galaxy means that most of it is actually empty 218 00:09:37,260 --> 00:09:38,260 space. 219 00:09:38,260 --> 00:09:39,900 We're not going to get sideswiped by a rogue star. 220 00:09:39,900 --> 00:09:40,900 Not likely. 221 00:09:40,900 --> 00:09:43,880 However, it will definitely feel the effects of the galactic merger. 222 00:09:43,880 --> 00:09:48,280 The gravitational forces will disrupt the orbits of stars in both galaxies, potentially 223 00:09:48,280 --> 00:09:52,560 flinging our solar system out to a new location within the merged galaxy. 224 00:09:52,560 --> 00:09:54,500 So we might end up with a new cosmic address. 225 00:09:54,500 --> 00:09:56,460 It's certainly a possibility. 226 00:09:56,460 --> 00:09:59,460 And who knows what the night sky would look like from that new vantage point. 227 00:09:59,460 --> 00:10:04,840 Yeah, the combined light of the Milky Way and Andromeda would create a spectacular display. 228 00:10:04,840 --> 00:10:08,620 But all the familiar constellations that we know today would be completely rearranged. 229 00:10:08,620 --> 00:10:12,180 It's both exciting and a little unsettling to think about, isn't it? 230 00:10:12,180 --> 00:10:13,180 It is. 231 00:10:13,180 --> 00:10:14,180 It really is. 232 00:10:14,180 --> 00:10:18,220 Knowing that the universe is constantly in motion, that even galaxies themselves are 233 00:10:18,220 --> 00:10:20,460 not immune to change. 234 00:10:20,460 --> 00:10:23,420 But it also underscores the vastness of time and space. 235 00:10:23,420 --> 00:10:24,420 That's right. 236 00:10:24,420 --> 00:10:27,340 And that's why our place within it all is constantly evolving. 237 00:10:27,340 --> 00:10:31,620 It's a humbling reminder that we are part of something much larger than ourselves, something 238 00:10:31,620 --> 00:10:37,780 that's been unfolding for billions of years and will continue to unfold for billions more. 239 00:10:37,780 --> 00:10:40,660 And Andromeda is a fantastic example of that. 240 00:10:40,660 --> 00:10:46,180 It's a galaxy teeming with stories of stellar birth and death, galactic mergers, and the 241 00:10:46,180 --> 00:10:48,220 powerful forces that shape the universe. 242 00:10:48,220 --> 00:10:49,220 It really is. 243 00:10:49,220 --> 00:10:53,180 And, you know, it offers us a glimpse into our own past and our potential future. 244 00:10:53,180 --> 00:10:56,500 It reminds us that there's still so much out there to explore and discover. 245 00:10:56,500 --> 00:10:57,500 There really is. 246 00:10:57,500 --> 00:11:00,540 Well, I think we've covered a lot of ground in this first part of our deep dive into the 247 00:11:00,540 --> 00:11:01,540 Andromeda galaxy. 248 00:11:01,540 --> 00:11:03,340 But there's so much more to explore. 249 00:11:03,340 --> 00:11:08,620 So join us for part two, where we'll delve even deeper into Andromeda's mysteries and 250 00:11:08,620 --> 00:11:13,140 uncover even more fascinating insights about our incredible galactic neighbor. 251 00:11:13,140 --> 00:11:18,780 You know, Andromeda's story, it's like this tapestry woven with threads of cosmic drama 252 00:11:18,780 --> 00:11:23,860 from the birth and death of stars to the grand ballet of galactic mergers. 253 00:11:23,860 --> 00:11:28,660 It's a galaxy that's constantly evolving, shaping and reshaping itself over eons. 254 00:11:28,660 --> 00:11:33,540 It makes you really appreciate the immense scale of time and the incredible forces that 255 00:11:33,540 --> 00:11:34,980 are at play in the universe. 256 00:11:34,980 --> 00:11:35,980 It does. 257 00:11:35,980 --> 00:11:40,480 And as we delve deeper into these mysteries that Andromeda holds, we uncover clues not 258 00:11:40,480 --> 00:11:45,220 only about its own evolution, but also about the processes that govern the evolution of 259 00:11:45,220 --> 00:11:46,920 galaxies in general. 260 00:11:46,920 --> 00:11:51,660 So by studying Andromeda, we're not just learning about one galaxy, but we're gaining insights 261 00:11:51,660 --> 00:11:54,780 into the grand cosmic dance of galactic interactions. 262 00:11:54,780 --> 00:11:55,780 Precisely. 263 00:11:55,780 --> 00:11:59,660 It's like having a front row seat to this intricate interplay of gravity, matter and 264 00:11:59,660 --> 00:12:01,980 energy that shapes the universe as we know it. 265 00:12:01,980 --> 00:12:05,820 I'm particularly intrigued by Andromeda's history of galactic mergers. 266 00:12:05,820 --> 00:12:09,220 And we touched upon it briefly in the first part, but I'd love to hear more about how 267 00:12:09,220 --> 00:12:12,700 those collisions have left their mark on the galaxy that we see today. 268 00:12:12,700 --> 00:12:17,340 Well, as we mentioned, Andromeda's entourage of satellite galaxies, they're thought to 269 00:12:17,340 --> 00:12:19,980 be remnants of past mergers. 270 00:12:19,980 --> 00:12:24,920 These smaller galaxies were drawn in by Andromeda's gravitational pull, and their stars and gas 271 00:12:24,920 --> 00:12:29,100 slowly merged with the larger galaxy over billions of years. 272 00:12:29,100 --> 00:12:34,100 So those satellite galaxies were like cosmic crumbs, evidence of Andromeda's galactic 273 00:12:34,100 --> 00:12:35,100 feasts. 274 00:12:35,100 --> 00:12:36,620 That's a great way to put it. 275 00:12:36,620 --> 00:12:41,960 And by studying the composition and distribution of stars in these satellite galaxies, astronomers 276 00:12:41,960 --> 00:12:46,500 can actually piece together a timeline of Andromeda's past mergers. 277 00:12:46,500 --> 00:12:50,120 It's much like archaeologists sifting through layers of an ancient city. 278 00:12:50,120 --> 00:12:54,900 It's like a cosmic detective story, uncovering clues from the faint whispers of starlight. 279 00:12:54,900 --> 00:12:55,900 Exactly. 280 00:12:55,900 --> 00:12:59,780 And one of the most striking examples of this is the giant stellar stream, known as the 281 00:12:59,780 --> 00:13:01,940 Andromeda giant stellar stream. 282 00:13:01,940 --> 00:13:02,940 That sounds intriguing. 283 00:13:02,940 --> 00:13:03,940 Tell us more about it. 284 00:13:03,940 --> 00:13:08,000 It's a vast ribbon of stars stretching across hundreds of thousands of light years, arching 285 00:13:08,000 --> 00:13:10,960 around Andromeda like a ghostly halo. 286 00:13:10,960 --> 00:13:15,020 This stream is thought to be the remnants of a galaxy that was torn apart by Andromeda's 287 00:13:15,020 --> 00:13:17,020 gravity billions of years ago. 288 00:13:17,020 --> 00:13:21,460 So it's like a galactic graveyard, the scattered bones of a galaxy long gone. 289 00:13:21,460 --> 00:13:23,260 In a way, yes. 290 00:13:23,260 --> 00:13:27,780 And by studying this stellar stream, astronomers can learn about the mass and distribution 291 00:13:27,780 --> 00:13:32,300 of dark matter in Andromeda, as well as the dynamics of galactic collisions. 292 00:13:32,300 --> 00:13:36,300 It's amazing how even the destruction of a galaxy can provide valuable insights into 293 00:13:36,300 --> 00:13:38,100 the workings of the universe. 294 00:13:38,100 --> 00:13:43,260 It is, and as we uncover more about Andromeda's past mergers, we gain a deeper understanding 295 00:13:43,260 --> 00:13:48,260 of the processes that have shaped not only our neighboring galaxy, but also our own Milky 296 00:13:48,260 --> 00:13:49,260 Way. 297 00:13:49,260 --> 00:13:53,260 Speaking of our own galaxy, I remember you mentioned that NGC 206, that massive star 298 00:13:53,260 --> 00:13:58,260 cluster in Andromeda, is actually visible from Earth with a decent amateur telescope. 299 00:13:58,260 --> 00:14:02,180 I'd love to hear more about what makes this cluster so special and how our listeners might 300 00:14:02,180 --> 00:14:04,100 be able to spot it in the night sky. 301 00:14:04,100 --> 00:14:07,020 NGC 206 is truly a celestial gem. 302 00:14:07,020 --> 00:14:11,220 It's a dazzling collection of hundreds of thousands of stars packed into a relatively 303 00:14:11,220 --> 00:14:12,300 small area. 304 00:14:12,300 --> 00:14:14,500 What makes it so much brighter than other star clusters? 305 00:14:14,500 --> 00:14:18,780 Well, for one thing, it's incredibly young, cosmically speaking. 306 00:14:18,780 --> 00:14:22,780 Most of its stars formed within the last hundred million years, which means they're still 307 00:14:22,780 --> 00:14:24,880 burning hot and bright. 308 00:14:24,880 --> 00:14:29,760 And many of these stars are massive, several times larger than our sun, which further amplifies 309 00:14:29,760 --> 00:14:31,020 their luminosity. 310 00:14:31,020 --> 00:14:35,360 So it's like a cosmic fireworks display, still sparkling from its recent formation. 311 00:14:35,360 --> 00:14:37,220 A very apt analogy. 312 00:14:37,220 --> 00:14:42,300 And to find NGC 206, you'll first need to locate the Andromeda galaxy itself. 313 00:14:42,300 --> 00:14:46,580 On a clear night, away from city lights, it appears as a faint, fuzzy patch of light in 314 00:14:46,580 --> 00:14:48,260 the constellation Andromeda. 315 00:14:48,260 --> 00:14:53,140 And once you've found Andromeda, how do you pinpoint NGC 206 within it? 316 00:14:53,140 --> 00:14:56,660 You can use a star chart or a mobile astronomy app to guide you. 317 00:14:56,660 --> 00:15:02,220 NGC 206 is located near the edge of Andromeda's disk, appearing as a slightly brighter knot 318 00:15:02,220 --> 00:15:04,300 within the galaxy's hazy glow. 319 00:15:04,300 --> 00:15:08,020 It sounds like a rewarding challenge for amateur astronomers, a chance to glimpse a distant 320 00:15:08,020 --> 00:15:10,580 star cluster that's been shining for millions of years. 321 00:15:10,580 --> 00:15:15,100 It is, and it's a reminder that even though Andromeda is millions of light-years away, 322 00:15:15,100 --> 00:15:18,740 we can still connect with its wonders through the power of observation and the beauty of 323 00:15:18,740 --> 00:15:19,880 the night sky. 324 00:15:19,880 --> 00:15:25,500 As we continue our exploration of Andromeda, I want to shift our focus now to its ultimate 325 00:15:25,500 --> 00:15:29,860 fate, the inevitable collision with our own Milky Way. 326 00:15:29,860 --> 00:15:35,340 It's a topic that has sparked both awe and anxiety among astronomers and the public alike. 327 00:15:35,340 --> 00:15:39,620 What can you tell us about the science behind this collision and what it means for the future 328 00:15:39,620 --> 00:15:40,620 of our galaxy? 329 00:15:40,620 --> 00:15:44,700 Well, the collision between Andromeda and the Milky Way is a celestial event of epic 330 00:15:44,700 --> 00:15:45,700 proportions. 331 00:15:45,700 --> 00:15:50,500 It's a slow-motion dance of gravity that will unfold over billions of years. 332 00:15:50,500 --> 00:15:54,780 As we mentioned earlier, both galaxies are hurtling toward each other at a tremendous 333 00:15:54,780 --> 00:15:58,900 speed, drawn together by their mutual gravitational attraction. 334 00:15:58,900 --> 00:16:01,900 As you explained before, it's not like two cars colliding head-on. 335 00:16:01,900 --> 00:16:04,060 The galaxies will actually pass through each other, right? 336 00:16:04,060 --> 00:16:05,180 Yes, that's correct. 337 00:16:05,180 --> 00:16:08,960 The vast distances between stars mean that direct collisions between individual stars 338 00:16:08,960 --> 00:16:10,500 will be extremely rare. 339 00:16:10,500 --> 00:16:15,100 However, the gravitational forces will create tidal tails of stars and gas, distort the 340 00:16:15,100 --> 00:16:18,620 shapes of both galaxies, and trigger waves of new star formation. 341 00:16:18,620 --> 00:16:23,980 So it's more like a cosmic ballet, a graceful interplay of forces that reshapes the galaxies 342 00:16:23,980 --> 00:16:24,980 involved. 343 00:16:24,980 --> 00:16:25,980 Exactly. 344 00:16:25,980 --> 00:16:30,300 And as the galaxies continue to interact, their supermassive black holes will eventually 345 00:16:30,300 --> 00:16:36,480 spiral towards each other, drawing closer and closer until they finally merge in a cataclysmic 346 00:16:36,480 --> 00:16:40,860 event that will send shockwaves throughout the newly formed galaxy. 347 00:16:40,860 --> 00:16:43,700 A cosmic merger of epic proportions. 348 00:16:43,700 --> 00:16:47,060 It's hard to even fathom the amount of energy that would be released. 349 00:16:47,060 --> 00:16:48,660 It's truly mind-boggling. 350 00:16:48,660 --> 00:16:53,060 But amidst all this cosmic drama, it's important to remember that this collision is billions 351 00:16:53,060 --> 00:16:54,440 of years in the future. 352 00:16:54,440 --> 00:16:58,740 Our solar system will likely still be around, although its position and view of the night 353 00:16:58,740 --> 00:17:00,540 sky will be dramatically altered. 354 00:17:00,540 --> 00:17:04,900 It's a sobering reminder of the vastness of time and the ever-changing nature of the 355 00:17:04,900 --> 00:17:06,020 universe. 356 00:17:06,020 --> 00:17:11,060 And as we've seen, Andromeda is a galaxy that embodies this concept of change, from 357 00:17:11,060 --> 00:17:14,940 its history of galactic mergers to its ongoing evolution. 358 00:17:14,940 --> 00:17:19,220 It's a galaxy that offers us a glimpse into the past, present, and future of our own Milky 359 00:17:19,220 --> 00:17:23,820 Way, reminding us that we are part of a grand cosmic story that's still being written. 360 00:17:23,820 --> 00:17:24,820 Well said. 361 00:17:24,820 --> 00:17:29,580 And I think that's a perfect point to pause our deep dive into Andromeda for now. 362 00:17:29,580 --> 00:17:33,700 Join us for part three, where we'll explore some of the philosophical implications of 363 00:17:33,700 --> 00:17:39,780 these cosmic events and wrap up our journey through the wonders of our galactic neighbor. 364 00:17:39,780 --> 00:17:44,700 As we conclude our deep dive into the Andromeda Galaxy Eye, I can't help but feel a sense 365 00:17:44,700 --> 00:17:46,780 of awe and wonder at it all. 366 00:17:46,780 --> 00:17:51,200 I know, I mean, it's a pretty natural response when you start contemplating the vastness 367 00:17:51,200 --> 00:17:53,580 and complexity of the universe, isn't it? 368 00:17:53,580 --> 00:17:58,580 Throughout this journey, we've explored its spiral arms, its mysterious double nucleus, 369 00:17:58,580 --> 00:18:03,460 the vibrant stellar nurseries, and of course, its inevitable collision with our own Milky 370 00:18:03,460 --> 00:18:04,460 Way. 371 00:18:04,460 --> 00:18:07,060 It's a galaxy that's both familiar and alien at the same time. 372 00:18:07,060 --> 00:18:08,620 It is, it really is. 373 00:18:08,620 --> 00:18:13,420 Offering us this almost like a glimpse into the past, present, and future of our own cosmic 374 00:18:13,420 --> 00:18:14,420 home. 375 00:18:14,420 --> 00:18:15,420 That's a good way to put it. 376 00:18:15,420 --> 00:18:17,380 We've discussed this Andromeda story. 377 00:18:17,380 --> 00:18:20,460 It's not just about stars, gas, and gravity. 378 00:18:20,460 --> 00:18:23,140 It's a story that touches upon some pretty fundamental questions. 379 00:18:23,140 --> 00:18:24,340 Like what? 380 00:18:24,340 --> 00:18:27,320 About our place in the universe, the nature of time. 381 00:18:27,320 --> 00:18:29,580 The interconnectedness of all things. 382 00:18:29,580 --> 00:18:31,020 It's almost philosophical, isn't it? 383 00:18:31,020 --> 00:18:32,020 It is. 384 00:18:32,020 --> 00:18:33,780 Here we are on this tiny planet. 385 00:18:33,780 --> 00:18:35,040 Orbiting an average star. 386 00:18:35,040 --> 00:18:39,580 In a galaxy that's just one of billions upon billions of others. 387 00:18:39,580 --> 00:18:40,580 And yet. 388 00:18:40,580 --> 00:18:45,540 And yet we have this capacity to study these distant realms, to unravel their secrets, 389 00:18:45,540 --> 00:18:47,440 and to contemplate their ultimate fate. 390 00:18:47,440 --> 00:18:48,720 It really is incredible. 391 00:18:48,720 --> 00:18:51,900 It's a testament to the power of human curiosity, isn't it? 392 00:18:51,900 --> 00:18:55,460 And our innate desire to just understand the world around us. 393 00:18:55,460 --> 00:18:56,700 It really is. 394 00:18:56,700 --> 00:18:59,500 Even though Andromeda is millions of light years away. 395 00:18:59,500 --> 00:19:00,840 Millions of light years away. 396 00:19:00,840 --> 00:19:02,580 We can still connect with its renders. 397 00:19:02,580 --> 00:19:03,580 We can. 398 00:19:03,580 --> 00:19:06,540 And it's all through the lens of science. 399 00:19:06,540 --> 00:19:07,940 And the beauty of the night sky. 400 00:19:07,940 --> 00:19:08,940 That's right. 401 00:19:08,940 --> 00:19:11,780 As we've learned, the light that we see from Andromeda. 402 00:19:11,780 --> 00:19:13,380 The light that we see. 403 00:19:13,380 --> 00:19:16,460 It's traveled for millions of years to reach our eyes. 404 00:19:16,460 --> 00:19:17,460 Millions of years. 405 00:19:17,460 --> 00:19:18,580 It's mind boggling. 406 00:19:18,580 --> 00:19:21,220 Carrying with its stories of stellar evolution. 407 00:19:21,220 --> 00:19:22,580 Galactic mergers. 408 00:19:22,580 --> 00:19:26,260 And the grand cycles of cosmic creation and destruction. 409 00:19:26,260 --> 00:19:30,140 It's a reminder that we're all part of something much larger than ourselves. 410 00:19:30,140 --> 00:19:31,140 It is. 411 00:19:31,140 --> 00:19:35,140 This cosmic tapestry, it stretches back to the dawn of time. 412 00:19:35,140 --> 00:19:37,940 And will continue to unfold for billions of years to come. 413 00:19:37,940 --> 00:19:39,660 It really is incredible. 414 00:19:39,660 --> 00:19:41,260 Andromeda's story is still being written. 415 00:19:41,260 --> 00:19:42,260 It is. 416 00:19:42,260 --> 00:19:43,780 And our own story is intertwined with it. 417 00:19:43,780 --> 00:19:44,780 It is. 418 00:19:44,780 --> 00:19:49,140 As we gaze up at this neighboring galaxy, we're not just observing a distant object. 419 00:19:49,140 --> 00:19:52,100 We're witnessing a reflection of our own cosmic journey. 420 00:19:52,100 --> 00:19:56,540 And perhaps that's the most profound lesson that Andromeda teaches us. 421 00:19:56,540 --> 00:20:01,420 That even in the vastness of space and the immensity of time, we're all connected to 422 00:20:01,420 --> 00:20:02,860 everything around us. 423 00:20:02,860 --> 00:20:06,060 We're all part of the same cosmic story. 424 00:20:06,060 --> 00:20:09,980 A story that continues to unfold with each passing moment. 425 00:20:09,980 --> 00:20:11,540 It's a beautiful and humbling thought. 426 00:20:11,540 --> 00:20:15,820 And I think it's a perfect note to end our deep dive into the Andromeda galaxy. 427 00:20:15,820 --> 00:20:20,100 I want to thank you, our listeners, for joining us on this episode of Cosmos in a Pod, space 428 00:20:20,100 --> 00:20:21,440 and astronomy series. 429 00:20:21,440 --> 00:20:25,220 We hope you enjoyed exploring the wonders of our galactic neighbor. 430 00:20:25,220 --> 00:20:29,700 And that you'll continue to look up at the night sky with a sense of curiosity and awe. 431 00:20:29,700 --> 00:20:32,180 Don't forget to subscribe to Cosmos in a Pod. 432 00:20:32,180 --> 00:20:36,940 And follow us on our YouTube channel for more explorations of the universe's most fascinating 433 00:20:36,940 --> 00:20:37,940 mysteries. 434 00:20:37,940 --> 00:20:42,200 Until next time, keep exploring the cosmos and never stop asking questions. 435 00:20:42,200 --> 00:20:45,660 And remember, the universe is full of stories waiting to be discovered.