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These are the user uploaded subtitles that are being translated: 1 00:00:13,442 --> 00:00:17,792 In 1973, nine astronauts were sent to live and 2 00:00:17,793 --> 00:00:21,793 work in the world's first space station, SkyLab. 3 00:00:23,574 --> 00:00:27,428 Their mission was to observe the Sun, free from the Earth's 4 00:00:27,429 --> 00:00:29,262 distorting atmosphere. 5 00:00:43,764 --> 00:00:47,397 The astronauts witnessed what no human beings had ever 6 00:00:47,398 --> 00:00:51,635 seen before: a sun more powerful than anyone 7 00:00:51,636 --> 00:00:53,303 could have imagined. 8 00:01:49,637 --> 00:01:53,804 To our ancestors, the sky was an unfathomable mystery. 9 00:01:55,024 --> 00:01:59,191 At night, it was brimming with pinpoints of light: stars. 10 00:02:11,244 --> 00:02:13,298 Then there was the Sun. 11 00:02:13,299 --> 00:02:17,454 Its arrival in the morning caused those stars to vanish, 12 00:02:17,455 --> 00:02:21,297 and miraculously brought warmth and light. 13 00:02:21,298 --> 00:02:25,298 It was seen as the giver of life, the first god. 14 00:02:26,302 --> 00:02:30,411 This is the story of mankind's struggle to see behind 15 00:02:30,412 --> 00:02:33,581 the glare, and glimpse the truth about the Sun, 16 00:02:33,582 --> 00:02:37,110 how we came to understand the scope of its power, 17 00:02:37,111 --> 00:02:40,072 and its role in the Universe. 18 00:02:50,033 --> 00:02:54,502 In February, 1998, the Caribbean island of Guadelupe 19 00:02:54,503 --> 00:02:57,503 prepared for a rare celestial event. 20 00:02:58,822 --> 00:03:02,803 For a few brief minutes, day would become night during a 21 00:03:02,804 --> 00:03:04,887 total eclipse of the Sun. 22 00:03:07,250 --> 00:03:11,046 This was Francisco Diego's tenth eclipse. 23 00:03:11,047 --> 00:03:14,343 As a young boy in Mexico, he was deeply affected by the 24 00:03:14,344 --> 00:03:16,491 first one he saw. 25 00:03:16,492 --> 00:03:21,205 It started a lifelong fascination with the Sun. 26 00:03:21,206 --> 00:03:25,152 The Sun was perceived as the immaculate, gold disc, 27 00:03:25,153 --> 00:03:29,134 perfect, it was perfection, it was a religious belief, 28 00:03:29,135 --> 00:03:31,886 because everything was perfect in the sky, and the Sun was 29 00:03:31,887 --> 00:03:35,427 the most perfect circle in the sky, with no blemishes, 30 00:03:35,428 --> 00:03:39,490 no structure, just a perfect, flat disc, golden disc. 31 00:03:39,491 --> 00:03:41,963 And it was the Sun god for many, many religions 32 00:03:41,964 --> 00:03:43,323 in the world. 33 00:03:54,561 --> 00:03:57,439 The Sun remained a symbol of perfection until 34 00:03:57,440 --> 00:04:01,665 a 17th century Florentine called Galileo first pointed a 35 00:04:01,666 --> 00:04:05,938 telescope at the sky and found that that idea might 36 00:04:05,939 --> 00:04:07,106 just be wrong. 37 00:04:08,853 --> 00:04:12,045 What Galileo did was apply the telescope for the first 38 00:04:12,046 --> 00:04:15,040 time, and discover that the Sun was not perfect. 39 00:04:15,041 --> 00:04:19,011 That the Sun have sunspots, and that was a major revolution 40 00:04:19,012 --> 00:04:22,345 in philosophy and of course, in science. 41 00:04:23,528 --> 00:04:26,151 Over several weeks, Galileo watched the 42 00:04:26,152 --> 00:04:30,261 sunspots move across the surface of the Sun, and realized 43 00:04:30,262 --> 00:04:32,012 that it was spinning. 44 00:04:33,176 --> 00:04:37,749 Galileo's discovery completely changed ideas about the Sun. 45 00:04:37,750 --> 00:04:40,837 But although he spent the rest of his life studying it, 46 00:04:40,838 --> 00:04:43,088 he never saw anything more. 47 00:04:45,332 --> 00:04:48,279 The blinding light of the Sun made further scientific 48 00:04:48,280 --> 00:04:50,530 observation very difficult. 49 00:04:55,746 --> 00:04:58,833 But there were moments, provided the scientists chose them 50 00:04:58,834 --> 00:05:01,410 carefully, when it was possible to cheat 51 00:05:01,411 --> 00:05:03,411 the Sun's dazzling rays. 52 00:05:08,412 --> 00:05:11,975 Roughly three times every decade, somewhere in the world, 53 00:05:11,976 --> 00:05:15,726 the Moon passes directly in front of the Sun. 54 00:05:17,805 --> 00:05:21,222 It offers a rare and special opportunity. 55 00:05:22,205 --> 00:05:25,489 If the Sun was this big, the Earth would be a little ball 56 00:05:25,490 --> 00:05:28,903 of about three or four millimeters in diameter, and the Moon 57 00:05:28,904 --> 00:05:30,958 is even smaller than that. 58 00:05:30,959 --> 00:05:32,734 The Moon is only a quarter of the size of the Earth, 59 00:05:32,735 --> 00:05:36,391 so the Moon is four hundred times smaller than the Sun. 60 00:05:36,392 --> 00:05:40,559 But the fantastic coincidence is that the Sun is 400 times 61 00:05:41,419 --> 00:05:45,064 farther away than the Moon from us. 62 00:05:45,065 --> 00:05:47,769 So we see both of them, by coincidence, more or less 63 00:05:47,770 --> 00:05:48,937 the same size. 64 00:05:50,359 --> 00:05:51,879 One minute! 65 00:05:51,880 --> 00:05:54,596 For four hours, Francisco watched the Moon 66 00:05:54,597 --> 00:05:56,264 creep into position. 67 00:05:59,995 --> 00:06:02,003 No theatres! 68 00:06:02,004 --> 00:06:04,360 He'd come halfway around the world to watch 69 00:06:04,361 --> 00:06:07,278 just four minutes of total eclipse. 70 00:06:10,769 --> 00:06:13,973 But even if you are in the right place at the right time, 71 00:06:13,974 --> 00:06:17,224 there's never any guarantee of success. 72 00:06:30,274 --> 00:06:33,837 In the end, Francisco got just a few moments to glimpse 73 00:06:33,838 --> 00:06:35,088 the hidden Sun. 74 00:06:36,358 --> 00:06:38,441 We lost it. 75 00:06:39,562 --> 00:06:40,562 No corona. 76 00:06:42,070 --> 00:06:44,368 Then, to his huge disappointment, 77 00:06:44,369 --> 00:06:46,678 he was thwarted as the clouds rolled in 78 00:06:46,679 --> 00:06:48,429 to wreck his eclipse. 79 00:07:01,969 --> 00:07:05,219 Douglas Gough is a leading solar scientist. 80 00:07:05,220 --> 00:07:09,387 To see his first total eclipse, he traveled to Indonesia. 81 00:07:10,282 --> 00:07:13,323 The Indonesian government had declared it to be illegal 82 00:07:13,324 --> 00:07:16,818 to watch the eclipse, at least for the Indonesians. 83 00:07:16,819 --> 00:07:19,128 They had either to watch it on television, 84 00:07:19,129 --> 00:07:22,739 or to go to the mosque and pray for the dragon to spit 85 00:07:22,740 --> 00:07:24,062 the Sun out again. 86 00:07:24,063 --> 00:07:26,825 Which is what they believed was taking place. 87 00:07:26,826 --> 00:07:29,623 I was standing at the end of a road on my own, 88 00:07:29,624 --> 00:07:32,212 and a little boy came up to me, had be watching me. 89 00:07:32,213 --> 00:07:33,165 About three years old. 90 00:07:33,166 --> 00:07:34,917 And I gave him some dark film, 91 00:07:34,918 --> 00:07:36,601 to look at the Sun through, 92 00:07:36,602 --> 00:07:39,144 and then an old man of about 70, who turned out to be 93 00:07:39,145 --> 00:07:41,407 the head of the village, came too, and the three of us 94 00:07:41,408 --> 00:07:43,658 saw this fantastic eclipse. 95 00:07:51,196 --> 00:07:55,096 A total eclipse reveals the Sun's corona, 96 00:07:55,097 --> 00:07:58,597 an outer layer normally lost in the glare. 97 00:08:00,089 --> 00:08:02,921 A very eerie feeling, and almost total silence; 98 00:08:02,922 --> 00:08:04,430 the birds stopped singing. 99 00:08:04,431 --> 00:08:06,938 And the only thing we could hear in the distance was the 100 00:08:06,939 --> 00:08:09,106 chanting from the mosques. 101 00:08:16,227 --> 00:08:18,525 This is what early astronomers traveled 102 00:08:18,526 --> 00:08:19,943 the world to see. 103 00:08:21,242 --> 00:08:25,917 Within the corona were what looked like burning clouds. 104 00:08:25,918 --> 00:08:29,005 It seemed that the surface of the Sun was smothered in a 105 00:08:29,006 --> 00:08:31,423 turbulent, raging atmosphere. 106 00:08:32,952 --> 00:08:34,797 Well, you realize, when you see these things 107 00:08:34,798 --> 00:08:36,399 moving, that the Sun is active. 108 00:08:36,400 --> 00:08:39,638 It's not just a quiet, passive ball of gas, but it's 109 00:08:39,639 --> 00:08:43,639 churning away; interesting things are happening. 110 00:08:45,975 --> 00:08:48,496 Seeing anything for the first time is exciting. 111 00:08:48,497 --> 00:08:51,085 That's why explorers on Earth would explore parts of the 112 00:08:51,086 --> 00:08:53,291 Earth where no man had been before. 113 00:08:53,292 --> 00:08:55,904 There's very little left of the Earth now to do that, 114 00:08:55,905 --> 00:08:58,040 so we go elsewhere in the Universe. 115 00:08:58,041 --> 00:09:01,999 Seeing the Sun, peeling off a layer of mist, 116 00:09:02,000 --> 00:09:05,517 a lack of understanding, and suddenly seeing how something 117 00:09:05,518 --> 00:09:07,479 works is an amazing experience when you see this 118 00:09:07,480 --> 00:09:09,063 for the first time. 119 00:09:11,601 --> 00:09:15,002 For more than 200 years, scientists had only 120 00:09:15,003 --> 00:09:19,170 fleeting chances to study these unique views of the Sun. 121 00:09:21,690 --> 00:09:25,010 Then, in the middle of the 19th century, father Angelo 122 00:09:25,011 --> 00:09:28,412 Secchi, the Vatican's chief astronomer, found himself 123 00:09:28,413 --> 00:09:32,580 at the forefront of a revolution in how we looked at light. 124 00:09:35,483 --> 00:09:38,524 Through an observatory above his church in Rome, 125 00:09:38,525 --> 00:09:42,216 he pioneered the use of a new branch of science called 126 00:09:42,217 --> 00:09:43,300 spectroscopy. 127 00:09:44,272 --> 00:09:47,522 Secchi's spectroscope split sunlight into its different 128 00:09:47,523 --> 00:09:51,690 colors, then magnified the light from just one region. 129 00:09:53,014 --> 00:09:56,718 What the discovered at the edge of the Sun was a revelation. 130 00:10:21,644 --> 00:10:24,488 Spectroscopy revealed a complexity that would have 131 00:10:24,489 --> 00:10:26,072 astonished Galileo. 132 00:10:28,007 --> 00:10:30,954 What had happened is that you were no longer dazzled 133 00:10:30,955 --> 00:10:32,151 by most of the light from the Sun; 134 00:10:32,152 --> 00:10:33,440 you could see something else. 135 00:10:33,441 --> 00:10:35,379 You could see the kinds of things that you can see at the 136 00:10:35,380 --> 00:10:37,724 edge of the Sun during an eclipse when you're no longer 137 00:10:37,725 --> 00:10:40,812 dazzled by the light from the Sun. 138 00:10:40,813 --> 00:10:42,983 Astronomers could now study not just the 139 00:10:42,984 --> 00:10:45,567 edges, but the body of the Sun. 140 00:10:47,292 --> 00:10:50,797 Galileo's sunspots were revealed as Earth-sized tears 141 00:10:50,798 --> 00:10:54,965 in the surface, like windows on a mysterious interior. 142 00:11:01,525 --> 00:11:05,275 The surface itself bubbled before their eyes. 143 00:11:06,831 --> 00:11:10,313 Soon, they were able to identify the chemicals that made up 144 00:11:10,314 --> 00:11:11,314 the Sun. 145 00:11:12,032 --> 00:11:14,528 Dark bands in its spectrum revealed the presence 146 00:11:14,529 --> 00:11:18,986 of hydrogen, calcium, iron, and astronomers discovered 147 00:11:18,987 --> 00:11:22,689 an alien element, completely unknown on Earth. 148 00:11:22,690 --> 00:11:26,857 They named it after Helios, the Greek Sun god: Helium. 149 00:11:32,048 --> 00:11:36,076 In 1862, Father Secchi turned his spectroscope to the night 150 00:11:36,077 --> 00:11:39,477 sky to see what stars were made of. 151 00:11:39,478 --> 00:11:44,203 He recognized the pattern of chemicals immediately. 152 00:11:44,204 --> 00:11:47,152 They were all but identical to the Sun. 153 00:11:47,153 --> 00:11:51,320 One of the great mysteries of the heavens had been resolved. 154 00:11:52,574 --> 00:11:54,157 Our Sun was a star. 155 00:11:57,729 --> 00:12:00,236 The religious implications of Secchi's discovery were 156 00:12:00,237 --> 00:12:04,288 profound, but what troubled the church was a huge step 157 00:12:04,289 --> 00:12:06,289 forward for astronomers. 158 00:12:09,502 --> 00:12:12,624 The Sun was one of those stars, and so now, for the first 159 00:12:12,625 --> 00:12:16,409 time, one realized that the Sun was a member of the family 160 00:12:16,410 --> 00:12:19,578 of stars, but from a scientific point of view, that's 161 00:12:19,579 --> 00:12:22,748 fantastic, because we want to know what most of the Universe 162 00:12:22,749 --> 00:12:25,662 is like, and so, by studying the Sun, we can study 163 00:12:25,663 --> 00:12:26,913 a typical star. 164 00:12:45,191 --> 00:12:48,572 By the late 1940s, rockets were going beyond 165 00:12:48,573 --> 00:12:50,335 the Earth's atmosphere. 166 00:13:02,572 --> 00:13:05,776 Scientists discovered that the fringes of space were 167 00:13:05,777 --> 00:13:07,777 scorched with radiation. 168 00:13:09,689 --> 00:13:12,660 It seemed that while our atmosphere allowed heat and light 169 00:13:12,661 --> 00:13:16,271 to pass through, it was shielding us from x-rays, gamma 170 00:13:16,272 --> 00:13:20,242 rays, and ultraviolet light that had to be coming 171 00:13:20,243 --> 00:13:21,326 from the Sun. 172 00:13:24,155 --> 00:13:27,695 Alexei Leonov was the first man to brave this dangerous 173 00:13:27,696 --> 00:13:31,363 radiation and come face to face with a star. 174 00:14:15,889 --> 00:14:20,254 Then, in 1973, the first solar space laboratory was 175 00:14:20,255 --> 00:14:24,422 launched, but the project almost ended in disaster. 176 00:14:29,461 --> 00:14:32,641 When SkyLab was launched, it had a heat shield wrapped 177 00:14:32,642 --> 00:14:36,809 around it that was to open up after it got into orbit, 178 00:14:38,169 --> 00:14:41,778 and what happened was 60 seconds into the flight, 179 00:14:41,779 --> 00:14:45,517 that heat shield popped open, and of course, it's still 180 00:14:45,518 --> 00:14:49,685 in the air stream, and so the air stream tore the heat 181 00:14:50,882 --> 00:14:52,901 shield off, and when it did that, 182 00:14:52,902 --> 00:14:55,319 it unlocked both solar wings. 183 00:14:56,849 --> 00:14:58,998 Commander Pete Conrad had already walked 184 00:14:58,999 --> 00:15:01,959 on the Moon when he was chosen to lead the first crew 185 00:15:01,960 --> 00:15:02,960 on SkyLab. 186 00:15:04,885 --> 00:15:08,425 But their new home was no longer protected by an atmosphere, 187 00:15:08,426 --> 00:15:11,843 and inside, temperatures started to soar. 188 00:15:12,745 --> 00:15:15,333 Their first job was to find some way of shielding 189 00:15:15,334 --> 00:15:19,571 the damaged station from the worst of the Sun's rays. 190 00:15:19,572 --> 00:15:22,160 Right away, on day one, we went in and got this temporary 191 00:15:22,161 --> 00:15:25,144 heat shield rigged, which we were able to rig from inside. 192 00:15:25,145 --> 00:15:27,535 We were able to put it out through one of the air locks. 193 00:15:27,536 --> 00:15:31,947 We were able to push, just like an umbrella, a pole 194 00:15:31,948 --> 00:15:36,115 and mylar sheets that then popped open like an umbrella, 195 00:15:37,451 --> 00:15:40,608 and then we were able to pull it back into where it was 196 00:15:40,609 --> 00:15:44,335 just offset by just a few inches off the side, and it did 197 00:15:44,336 --> 00:15:46,518 take care of the heating problem. 198 00:15:46,519 --> 00:15:49,936 Temperature began to go down immediately. 199 00:16:00,393 --> 00:16:02,272 As the temperatures finally dropped 200 00:16:02,273 --> 00:16:05,082 to safe levels, the crew made their way 201 00:16:05,083 --> 00:16:06,833 into the observatory. 202 00:16:08,078 --> 00:16:10,794 Their next task was to get to grips with life in a 203 00:16:10,795 --> 00:16:12,712 weightless environment. 204 00:16:14,487 --> 00:16:17,261 Initially, nausea prevented all but the toughest from 205 00:16:17,262 --> 00:16:21,429 eating, but the problem soon passed, and within a few days, 206 00:16:22,440 --> 00:16:26,190 space didn't seem such a bad place after all. 207 00:16:36,534 --> 00:16:39,819 And then, with no distorting atmosphere to blur their 208 00:16:39,820 --> 00:16:43,105 sights, the most comprehensive solar observation 209 00:16:43,106 --> 00:16:44,523 in history began. 210 00:16:48,690 --> 00:16:52,474 The SkyLab flight is very near and dear to my heart. 211 00:16:52,475 --> 00:16:57,362 I know a lot of people don't understand that it probably 212 00:16:57,363 --> 00:16:59,916 means more to me than going to the Moon, and of course, 213 00:16:59,917 --> 00:17:04,084 part of that was being able to run the solar telescope 214 00:17:05,374 --> 00:17:09,692 and know that we were bringing back a tremendous amount 215 00:17:09,693 --> 00:17:12,362 of information that nobody ever had before 216 00:17:12,363 --> 00:17:14,289 in any great quantities. 217 00:17:14,290 --> 00:17:17,482 And to begin with, when I switch to the new position 218 00:17:17,483 --> 00:17:21,650 called H-Album, these words stand for hydrogen album, 219 00:17:22,614 --> 00:17:25,504 and they are called hydrogen because the light that we see 220 00:17:25,505 --> 00:17:28,256 comes from light radiated by hydrogen atoms 221 00:17:28,257 --> 00:17:30,257 in the Sun's atmosphere. 222 00:17:31,136 --> 00:17:33,310 Viewing the Sun with the same wavelengths 223 00:17:33,311 --> 00:17:37,339 of light used by Secchi more than 100 years earlier, 224 00:17:37,340 --> 00:17:40,311 the SkyLab astronauts saw incredible details 225 00:17:40,312 --> 00:17:42,062 on the Sun's surface. 226 00:17:43,365 --> 00:17:47,277 For example we can see sunspots, we can see network, 227 00:17:47,278 --> 00:17:50,516 we can see filaments, all these things on the Sun, 228 00:17:50,517 --> 00:17:51,850 in great detail. 229 00:17:52,827 --> 00:17:56,692 Each one of us took a four-hour turn at the solar 230 00:17:56,693 --> 00:17:58,782 telescope panel. 231 00:17:58,783 --> 00:18:03,055 Now, I've always related that to playing three 88-keyboard 232 00:18:03,056 --> 00:18:05,621 pianos at the same time. 233 00:18:05,622 --> 00:18:09,789 It was a very complicated set of switching and everything. 234 00:18:12,483 --> 00:18:15,849 It was very involved and very intense, and you'd work 235 00:18:15,850 --> 00:18:19,181 real hard during that time frame, making sure those 236 00:18:19,182 --> 00:18:21,573 sequences ran the right way. 237 00:18:21,574 --> 00:18:24,011 And then things would come up in real time, like a solar 238 00:18:24,012 --> 00:18:26,193 flare all of a sudden. 239 00:18:26,194 --> 00:18:29,944 So we had to be prepared to catch that, also. 240 00:18:31,767 --> 00:18:34,495 Solar flares are planet-sized eruptions 241 00:18:34,496 --> 00:18:39,173 of boiling gas that somehow break free of the Sun. 242 00:18:39,174 --> 00:18:41,772 They had been seen from Earth, but never in such 243 00:18:41,773 --> 00:18:43,523 extraordinary detail. 244 00:18:45,453 --> 00:18:48,007 If somebody else was running it, they might call us, 245 00:18:48,008 --> 00:18:50,840 and we could go up and take a look also. 246 00:18:50,841 --> 00:18:53,521 So that happened quite frequently, when something really 247 00:18:53,522 --> 00:18:57,689 unusual came up that we could witness, we would call 248 00:18:58,754 --> 00:19:02,504 the other guys up, let them come take a peek. 249 00:19:06,751 --> 00:19:09,571 In nine months, successive SkyLab crews 250 00:19:09,572 --> 00:19:13,739 took more than 160,000 images, revealing aspects of the Sun 251 00:19:14,832 --> 00:19:17,582 that had never been known before. 252 00:19:19,267 --> 00:19:22,447 The most spectacular discoveries were the coronal mass 253 00:19:22,448 --> 00:19:25,825 ejections, outbursts of material on a scale 254 00:19:25,826 --> 00:19:27,993 that dwarfed solar flares. 255 00:19:29,936 --> 00:19:34,035 These were the best views yet of the turbulent Sun. 256 00:19:59,646 --> 00:20:02,966 But why were the coronal mass ejections so much more 257 00:20:02,967 --> 00:20:05,752 powerful than the solar flares? 258 00:20:05,753 --> 00:20:08,753 The key lay with Galileo's sunspots. 259 00:20:26,326 --> 00:20:29,332 Before the dawn of the space age, the summit of the 260 00:20:29,333 --> 00:20:32,676 San Gabriel mountains was as close as it was possible 261 00:20:32,677 --> 00:20:35,344 for an American to get to space. 262 00:20:38,760 --> 00:20:43,484 In 1903, George Ellery Hale, the son of a wealthy engineer, 263 00:20:43,485 --> 00:20:44,485 had a dream. 264 00:20:45,633 --> 00:20:48,802 He would indulge his passion for astronomy by building 265 00:20:48,803 --> 00:20:52,331 the world's most advanced solar observatory high above 266 00:20:52,332 --> 00:20:54,082 the town of Pasadena. 267 00:21:00,343 --> 00:21:03,059 Sallie Baliunas is an astrophysicist 268 00:21:03,060 --> 00:21:05,903 at the Mount Wilson Observatory. 269 00:21:05,904 --> 00:21:08,040 Hale is my personal hero. 270 00:21:08,041 --> 00:21:11,453 He was not only a great scientist, he had instinct 271 00:21:11,454 --> 00:21:14,727 about engineering, so he could build the largest telescopes 272 00:21:14,728 --> 00:21:19,080 in the world so successfully, he raised a lot of money 273 00:21:19,081 --> 00:21:21,844 to do these projects, something scientists always have to 274 00:21:21,845 --> 00:21:26,012 do, and as he often said himself, he made no small plans. 275 00:21:30,436 --> 00:21:33,235 The route to the top of Mt. Wilson wasn't easy. 276 00:21:36,531 --> 00:21:39,932 This road wasn't built until 1936, so all the 277 00:21:39,933 --> 00:21:44,100 tons of concrete and steel had to be brought up by backpack, 278 00:21:44,948 --> 00:21:48,070 or by mule train, on a very steep seven mile trail 279 00:21:48,071 --> 00:21:51,043 up the side of the mountain. 280 00:21:51,044 --> 00:21:53,678 The pack horses had to make over 60 trips 281 00:21:53,679 --> 00:21:56,279 to transport the telescope alone. 282 00:21:56,280 --> 00:21:58,810 But Hale soon had an observatory that was the envy 283 00:21:58,811 --> 00:21:59,894 of the world. 284 00:22:06,949 --> 00:22:10,234 Hale's first challenge was to understand the Sun's oldest 285 00:22:10,235 --> 00:22:12,235 known feature: sunspots. 286 00:22:14,925 --> 00:22:19,099 Hale built a spectrograph, which is beneath this table. 287 00:22:19,100 --> 00:22:22,722 75 feet below is a grating that disperses the light 288 00:22:22,723 --> 00:22:26,576 of the Sun into its energy components. 289 00:22:26,577 --> 00:22:29,327 The grating would look like this. 290 00:22:30,896 --> 00:22:35,063 And would break up the sunlight into its different colors, 291 00:22:36,318 --> 00:22:40,299 and buried in this spectrum are the absorption lines 292 00:22:40,300 --> 00:22:42,300 of the gases of the Sun. 293 00:22:43,296 --> 00:22:46,917 With his unique spectrograph, Hale set about, 294 00:22:46,918 --> 00:22:49,668 analyzing the surface of the Sun. 295 00:22:57,309 --> 00:23:01,000 He was able to take photographs of sunspots, in more detail 296 00:23:01,001 --> 00:23:04,084 than anyone had ever achieved before. 297 00:23:05,146 --> 00:23:08,314 But it was during a study of the chemical absorption lines 298 00:23:08,315 --> 00:23:12,482 of the Sun's surface that Hale made a profound discovery. 299 00:23:14,236 --> 00:23:17,751 When he looked at the quieter part of the Sun, 300 00:23:17,752 --> 00:23:21,374 he saw ordinary looking absorption lines, and then, 301 00:23:21,375 --> 00:23:24,613 as the sunspot rolled into the slit, the lines began 302 00:23:24,614 --> 00:23:27,900 to broaden a little bit, and then split. 303 00:23:27,901 --> 00:23:30,454 As Hale saw the lines split apart, 304 00:23:30,455 --> 00:23:33,078 he instantly recognized the phenomenon. 305 00:23:33,079 --> 00:23:33,912 Voila. 306 00:23:33,912 --> 00:23:34,863 Magnetic fields. 307 00:23:34,864 --> 00:23:35,942 He could see it. 308 00:23:35,943 --> 00:23:36,943 June, 1908. 309 00:23:39,716 --> 00:23:42,025 In that instant, Hale had unraveled 310 00:23:42,026 --> 00:23:45,334 one of the Sun's greatest mysteries. 311 00:23:45,335 --> 00:23:49,002 Sunspots were caused by magnetic distortion. 312 00:23:51,082 --> 00:23:54,576 These distortions are some 4,000 times greater than the 313 00:23:54,577 --> 00:23:56,494 Earth's magnetic field. 314 00:23:57,619 --> 00:24:00,996 They hold back the gases rising up, cooling the surface 315 00:24:00,997 --> 00:24:04,747 by 2,000 degrees, and causing the dark spots. 316 00:24:06,953 --> 00:24:08,601 So a sunspot, on the surface, 317 00:24:08,602 --> 00:24:12,095 is nothing more than a twisted and kinked magnetic field, 318 00:24:12,096 --> 00:24:14,263 looped out of the surface. 319 00:24:16,949 --> 00:24:19,259 This magnetogram shows how the surface 320 00:24:19,260 --> 00:24:22,742 of the Sun is speckled with positive and negative lines 321 00:24:22,743 --> 00:24:24,243 of magnetic force. 322 00:24:29,291 --> 00:24:32,755 These field lines channel the Sun's storms; 323 00:24:32,756 --> 00:24:36,465 eruptions of plasma, which explode outwards for thousands 324 00:24:36,466 --> 00:24:39,344 of kilometers, before being dragged back 325 00:24:39,345 --> 00:24:41,428 into its boiling surface. 326 00:24:44,929 --> 00:24:48,283 Coronal mass ejections and prominences, 327 00:24:48,284 --> 00:24:50,246 everything we see on the surface of the Sun, 328 00:24:50,247 --> 00:24:54,043 all the dynamical features, are all magnetic in nature. 329 00:25:09,078 --> 00:25:11,794 In one of the coldest places on Earth, 330 00:25:11,795 --> 00:25:15,579 some 15 years before Hale started his investigation 331 00:25:15,580 --> 00:25:19,723 into the sun, a scientist in Norway had drawn his own 332 00:25:19,724 --> 00:25:23,891 extraordinary conclusions about the Sun's magnetism. 333 00:25:26,307 --> 00:25:29,557 In a land where scientists cannot see the Sun for months 334 00:25:29,558 --> 00:25:33,133 on end, he was convinced that you could still feel its 335 00:25:33,134 --> 00:25:36,616 presence in one of the most beautiful natural phenomena 336 00:25:36,617 --> 00:25:37,617 on Earth. 337 00:25:40,471 --> 00:25:44,011 It may be strange to see why we are out here, far to 338 00:25:44,012 --> 00:25:48,737 the North, on top of a snowy roof, in the darkness, 339 00:25:48,738 --> 00:25:50,675 when you're dealing with the Sun. 340 00:25:50,676 --> 00:25:54,843 But here, you see the Aurora, the Northern Lights. 341 00:25:55,959 --> 00:25:59,081 I really like to see the Aurora of a dark sky. 342 00:25:59,082 --> 00:26:02,669 It's a beautiful sight, and many strange colors, 343 00:26:02,670 --> 00:26:05,792 which you do not see in any other place. 344 00:26:05,793 --> 00:26:10,169 It really lights up this dark days that we have here 345 00:26:10,170 --> 00:26:12,142 in the North, in Wintertime. 346 00:26:12,143 --> 00:26:15,358 Earlier, it was often thought the Northern Lights were 347 00:26:15,359 --> 00:26:18,359 the souls of dead soldiers fighting. 348 00:26:33,980 --> 00:26:36,696 Norway is one of the best places in the world 349 00:26:36,697 --> 00:26:38,114 to study Auroras. 350 00:26:40,319 --> 00:26:43,395 Truls Hansen monitors the radioactivity high in the 351 00:26:43,396 --> 00:26:44,979 Earth's atmosphere. 352 00:26:46,774 --> 00:26:50,941 It's an area of research that goes back over a century. 353 00:26:51,778 --> 00:26:56,375 100 years ago, Norway's most famous scientist dedicated 354 00:26:56,376 --> 00:27:00,008 his life to the study of these strange atmospheric 355 00:27:00,009 --> 00:27:04,176 disturbances; his name was Dr. Kristian Birkeland. 356 00:27:05,954 --> 00:27:08,182 Birkeland was certainly brilliant, but all the little 357 00:27:08,183 --> 00:27:12,350 bit mad, and you might see that from his book here, really. 358 00:27:13,674 --> 00:27:15,923 This book you will find not only the theories 359 00:27:15,924 --> 00:27:20,404 about particles and Aurora, but you will find a lot 360 00:27:20,405 --> 00:27:24,572 of ideas; some of them were right, most of them are wrong. 361 00:27:25,676 --> 00:27:29,320 And one of them was in his terella, which we see clearly 362 00:27:29,321 --> 00:27:33,488 here, was a vacuum chamber with a small globe pretending 363 00:27:34,708 --> 00:27:37,122 the Earth inside it. 364 00:27:37,123 --> 00:27:39,967 And we can also see Birkeland himself on the side here, 365 00:27:39,968 --> 00:27:42,486 controlling the experiment. 366 00:27:42,487 --> 00:27:44,901 Birkeland's most celebrated experiment 367 00:27:44,902 --> 00:27:48,558 artificially created the Northern Lights, and to protect 368 00:27:48,559 --> 00:27:52,726 his brain from radiation, bizarrely, he always wore a fez. 369 00:27:58,706 --> 00:28:01,817 Odd as he may have appeared, Birkeland's theories about the 370 00:28:01,818 --> 00:28:05,985 origin of Auroras stemmed from years of dedicated study. 371 00:28:13,149 --> 00:28:16,550 The Northern Lights were known to be particularly energetic 372 00:28:16,551 --> 00:28:19,634 following a period of solar activity. 373 00:28:20,707 --> 00:28:23,179 Birkeland wanted to try and find a mechanism 374 00:28:23,180 --> 00:28:24,847 that linked the two. 375 00:28:25,978 --> 00:28:30,006 These are the old magnetometers, which we are operate... 376 00:28:30,007 --> 00:28:32,955 Have been operating here for more than hundred years, 377 00:28:32,956 --> 00:28:35,671 and are still used some places around the world. 378 00:28:35,672 --> 00:28:39,672 And Birkeland, he used very similar instruments. 379 00:28:42,545 --> 00:28:45,145 We have here a recording of the magnetic field during 380 00:28:45,146 --> 00:28:47,978 one day, taken with this instrument. 381 00:28:47,979 --> 00:28:52,146 It starts rather quiet around noon, and then here, 382 00:28:54,179 --> 00:28:57,394 in the evening, we get a sort of attack, and we get 383 00:28:57,395 --> 00:29:00,726 a magnetic storm, which you see very clearly here, 384 00:29:00,727 --> 00:29:04,661 and during this period, we also have a large Aurora, 385 00:29:04,662 --> 00:29:06,245 very bright Aurora. 386 00:29:16,760 --> 00:29:19,058 What we see here is the so-called Birkeland terella 387 00:29:19,059 --> 00:29:22,193 experiment, he built several of this kind, but this is the 388 00:29:22,194 --> 00:29:26,361 biggest one, and the last one I suppose, being made in 1913. 389 00:29:29,078 --> 00:29:31,666 It's really a large vacuum chamber, 390 00:29:31,667 --> 00:29:34,417 with a model of the Earth inside. 391 00:29:35,615 --> 00:29:38,412 Birkeland's hunch was that the magnetic storms 392 00:29:38,413 --> 00:29:41,133 which accompanied the Northern Lights were caused 393 00:29:41,134 --> 00:29:44,697 by a stream of electrically charged particles buffeting 394 00:29:44,698 --> 00:29:46,948 the Earth's magnetic field. 395 00:29:48,100 --> 00:29:50,525 He believed that these particles had to be coming 396 00:29:50,526 --> 00:29:51,609 from the Sun. 397 00:29:53,115 --> 00:29:57,198 But other scientists never followed up his ideas. 398 00:29:58,409 --> 00:30:01,492 In 1917, Birkeland committed suicide. 399 00:30:05,654 --> 00:30:09,902 In fact, evidence for the extraordinary power of the Sun 400 00:30:09,903 --> 00:30:13,652 had been visible to humans for thousands of years. 401 00:30:13,653 --> 00:30:16,938 Chinese astronomers noted that the tails of comets 402 00:30:16,939 --> 00:30:20,850 always pointed directly away from sunlight. 403 00:30:20,851 --> 00:30:23,846 It was assumed that the trail of dust was being pushed 404 00:30:23,847 --> 00:30:27,097 away by the gentle pressure of the Sun. 405 00:30:31,138 --> 00:30:35,920 But in 1947, a German physicist, Ludwig Biermann, 406 00:30:35,921 --> 00:30:39,867 calculated that something far more substantial than sunlight 407 00:30:39,868 --> 00:30:43,035 had to be pushing the tails of comets. 408 00:30:45,464 --> 00:30:49,666 He called it "solar corpuscular radiation," but his idea 409 00:30:49,667 --> 00:30:52,500 was widely rejected by scientists. 410 00:30:53,615 --> 00:30:57,178 Despite the general derision, a physicist from Chicago 411 00:30:57,179 --> 00:31:00,138 called Eugene Parker believed there might be something 412 00:31:00,139 --> 00:31:02,056 in Biermann's argument. 413 00:31:03,181 --> 00:31:05,200 I had a particularly good chance to talk with him 414 00:31:05,201 --> 00:31:07,476 when he was visiting Chicago. 415 00:31:07,477 --> 00:31:09,601 He pointed out that if it isn't the sunlight, 416 00:31:09,602 --> 00:31:11,992 there is only one other possibility, and that is the 417 00:31:11,993 --> 00:31:14,721 solar corpuscular radiation, the emission of particles 418 00:31:14,722 --> 00:31:17,077 from the Sun, that interacts with the tail and blows 419 00:31:17,078 --> 00:31:19,248 it away from the Sun. 420 00:31:19,249 --> 00:31:22,372 His revelations about the comet tails really got to me, 421 00:31:22,373 --> 00:31:25,873 and I realized he had a fundamental point. 422 00:31:35,357 --> 00:31:37,747 The eminent physicist Sydney Chapman 423 00:31:37,748 --> 00:31:41,248 was particularly eager to attack Biermann. 424 00:31:42,265 --> 00:31:46,966 He pointed out that the volume of the Sun was 330,000 times 425 00:31:46,967 --> 00:31:50,774 greater than the earth, and that no particle, however small, 426 00:31:50,775 --> 00:31:54,525 could escape its enormous gravitational pull. 427 00:31:57,288 --> 00:32:00,805 Dismissing Biermann's ideas about solar wind, Chapman 428 00:32:00,806 --> 00:32:04,183 was interested in researching a quite different area: 429 00:32:04,184 --> 00:32:07,351 examining how the Sun's corona worked. 430 00:32:10,105 --> 00:32:13,425 He suggested that the corona, though still firmly bound 431 00:32:13,426 --> 00:32:16,838 to the Sun, stretched much further than could be seen 432 00:32:16,839 --> 00:32:18,922 during the solar eclipse. 433 00:32:21,239 --> 00:32:24,373 Eugene Parker met Sydney Chapman at an observatory 434 00:32:24,374 --> 00:32:26,124 in Boulder, Colorado. 435 00:32:27,996 --> 00:32:30,712 Coming home from Boulder, I was thinking about what I 436 00:32:30,713 --> 00:32:34,009 had learned from Chapman: this very basic idea that the 437 00:32:34,010 --> 00:32:37,202 corona extends out through the Solar System, filling 438 00:32:37,203 --> 00:32:41,033 everything, and then I realized that Chapman and Biermann 439 00:32:41,034 --> 00:32:44,760 were mutually exclusive, that is, the solar corpuscular 440 00:32:44,761 --> 00:32:48,034 radiation that seems to effect the comet tails cannot 441 00:32:48,035 --> 00:32:50,461 penetrate through a static corona. 442 00:32:50,462 --> 00:32:53,119 You get interactions that block this. 443 00:32:53,120 --> 00:32:56,939 And, on the other hand, I could not see that either one 444 00:32:56,940 --> 00:32:58,440 of them was wrong. 445 00:33:00,957 --> 00:33:03,394 Parker worked at the apparent contradiction 446 00:33:03,395 --> 00:33:07,562 in the two theories, and found that they were both right. 447 00:33:09,131 --> 00:33:12,357 I wrote down the equations of motion and integrated them 448 00:33:12,358 --> 00:33:15,840 and found there was one and only one solution that fitted 449 00:33:15,841 --> 00:33:18,522 the condition of strongly bound at the Sun and zero 450 00:33:18,523 --> 00:33:22,005 pressure in infinity, and that was the solution providing 451 00:33:22,006 --> 00:33:24,173 the supersonic solar wind. 452 00:33:55,129 --> 00:33:58,193 Immediately declared that it was false and published 453 00:33:58,194 --> 00:34:02,884 papers purportedly showing alternatives, and gave lectures 454 00:34:02,885 --> 00:34:07,725 decrying the idea, and a lot of my friends were sympathetic, 455 00:34:07,726 --> 00:34:09,826 they said, "Oh, well, it was a great idea, but you know, 456 00:34:09,827 --> 00:34:12,590 "great ideas often fall flat on their face." 457 00:34:12,591 --> 00:34:15,678 And my reaction, of course, was, "Well, we'll see what 458 00:34:15,679 --> 00:34:17,762 "falls flat on its face." 459 00:34:24,259 --> 00:34:26,893 Parker had to wait five years for his theory 460 00:34:26,894 --> 00:34:28,311 to be vindicated. 461 00:34:30,516 --> 00:34:35,299 In 1962, the Mariner II probe to Venus provided the evidence 462 00:34:35,300 --> 00:34:38,717 showing that Parker just had to be right. 463 00:34:46,585 --> 00:34:50,310 The world's first interplanetary probe signaled back 464 00:34:50,311 --> 00:34:54,536 that space is awash with the solar wind, exceeding even 465 00:34:54,537 --> 00:34:57,184 Eugene Parker's estimates. 466 00:34:57,185 --> 00:35:01,839 The JPL plasma detector simply showed there was a wind 467 00:35:01,840 --> 00:35:06,773 of anywhere from 300 to 800 kilometers per second, 468 00:35:06,774 --> 00:35:09,119 and the wind was always there and it never ceased, 469 00:35:09,120 --> 00:35:10,118 and that was it. 470 00:35:10,119 --> 00:35:13,701 I refused to argue with anybody after that. 471 00:35:15,621 --> 00:35:17,819 Modern space telescopes revealed 472 00:35:17,820 --> 00:35:21,674 the complexity of Parker's solar wind. 473 00:35:21,675 --> 00:35:25,122 From the Sun's equator, a constant stream of particles 474 00:35:25,123 --> 00:35:26,956 evaporates into space. 475 00:35:28,048 --> 00:35:31,472 Occasionally, violent gusts break free of the Sun's 476 00:35:31,473 --> 00:35:34,306 gravitational and magnetic forces. 477 00:35:35,432 --> 00:35:39,344 These are the flares and coronal mass ejections 478 00:35:39,345 --> 00:35:41,512 first witnessed by SkyLab. 479 00:35:42,805 --> 00:35:45,811 These electrically charged hurricanes are ferocious 480 00:35:45,812 --> 00:35:49,979 and brutal, and the planets lie in their firing line. 481 00:35:52,720 --> 00:35:56,306 Mercury, the closest planet to the Sun, bears the full 482 00:35:56,307 --> 00:35:58,976 brunt of the solar wind. 483 00:35:58,977 --> 00:36:02,309 Any atmosphere this moonlight world may once have had 484 00:36:02,310 --> 00:36:05,559 has long been blown away, leaving its surface bathed 485 00:36:05,560 --> 00:36:07,227 in deadly radiation. 486 00:36:09,531 --> 00:36:12,897 Mars is larger than Mercury, and four times further from 487 00:36:12,898 --> 00:36:16,415 the Sun, and yet, even here, it is thought that the solar 488 00:36:16,416 --> 00:36:19,259 wind has stripped away up to a third 489 00:36:19,260 --> 00:36:21,510 of its original atmosphere. 490 00:36:24,020 --> 00:36:27,351 Venus, our nearest neighbor, has an atmosphere many times 491 00:36:27,352 --> 00:36:30,648 thicker than the Earth, but probes have discovered its 492 00:36:30,649 --> 00:36:34,352 clouds are also being eroded by solar wind, 493 00:36:34,353 --> 00:36:37,881 creating a comet-like tail that stretches back to the orbit 494 00:36:37,882 --> 00:36:38,965 of the Earth. 495 00:36:42,306 --> 00:36:44,778 But what of our own atmosphere? 496 00:36:44,779 --> 00:36:48,516 The Earth's magnetic field stretches far into space, 497 00:36:48,517 --> 00:36:51,848 and fights a constant battle with the Sun to deflect 498 00:36:51,849 --> 00:36:56,016 the solar wind and protect our atmosphere from erosion. 499 00:36:59,791 --> 00:37:02,692 As the solar wind and the Earth's magnetic field is 500 00:37:02,693 --> 00:37:07,336 steadily battling against it's other magnet field, 501 00:37:07,337 --> 00:37:12,084 is being compressed by the solar wind, and as this pressure 502 00:37:12,085 --> 00:37:16,252 increases and sends the particles along the magnetic fields, 503 00:37:17,322 --> 00:37:20,200 and down to the polar areas of the Earth, and we see the 504 00:37:20,201 --> 00:37:23,951 most light as Aurora in the upper atmosphere. 505 00:37:28,386 --> 00:37:31,601 It's clear that we live in a region dominated by the 506 00:37:31,602 --> 00:37:34,561 solar wind, which extends far out into space, far beyond 507 00:37:34,562 --> 00:37:36,062 the outer planets. 508 00:37:37,059 --> 00:37:40,262 The next question is how far out into space does the solar 509 00:37:40,263 --> 00:37:43,304 wind extend, as is spreads out, going farther and farther 510 00:37:43,305 --> 00:37:44,388 from the Sun? 511 00:37:47,136 --> 00:37:50,096 To try and measure the solar wind, scientists 512 00:37:50,097 --> 00:37:52,394 relied on space probes. 513 00:37:52,395 --> 00:37:55,506 From as far away as Jupiter, these recorded massive 514 00:37:55,507 --> 00:37:56,840 radio emissions. 515 00:37:58,142 --> 00:38:01,555 The noise was being generated by a battle between Jupiter's 516 00:38:01,556 --> 00:38:04,389 magnetic field and the solar wind. 517 00:38:05,538 --> 00:38:09,113 As the spacecraft Voyager visited all the outer planets, 518 00:38:09,114 --> 00:38:12,944 it picked up the same telltale signature of solar wind 519 00:38:12,945 --> 00:38:15,112 buffeting magnetic fields. 520 00:38:17,461 --> 00:38:20,131 When it left Neptune, it was still accompanied 521 00:38:20,132 --> 00:38:21,632 by the solar wind. 522 00:38:23,998 --> 00:38:28,443 Three years beyond Pluto, it detected a mysterious burst 523 00:38:28,444 --> 00:38:29,777 of radio energy. 524 00:38:47,763 --> 00:38:50,282 The signals were picked up at the tracking station at 525 00:38:50,283 --> 00:38:53,862 Goldstone, California, where Don Gurnett had been keeping 526 00:38:53,863 --> 00:38:55,696 in touch with Voyager. 527 00:38:57,114 --> 00:39:00,120 Well, my primary interest these days is to follow the 528 00:39:00,121 --> 00:39:03,243 solar wind as it expands out from the Sun. 529 00:39:03,244 --> 00:39:06,343 We know that it has to be stopped someplace by the 530 00:39:06,344 --> 00:39:10,511 interstellar gas, and this boundary we call the heliopause. 531 00:39:16,189 --> 00:39:19,067 The radio burst picked up by Voyager 532 00:39:19,068 --> 00:39:21,235 was completely unexpected. 533 00:39:22,145 --> 00:39:26,312 There were no giant planets within three billion kilometers. 534 00:39:27,625 --> 00:39:29,934 We did not, at first, really know for sure the origin 535 00:39:29,935 --> 00:39:32,361 of this thing, and we thought it might be coming from 536 00:39:32,362 --> 00:39:34,543 a planet such as Jupiter or Saturn. 537 00:39:34,544 --> 00:39:36,517 It also occurred to us that it may be coming from 538 00:39:36,518 --> 00:39:39,101 much farther away from the Sun. 539 00:39:42,648 --> 00:39:45,108 In the end, their search led them back to the 540 00:39:45,109 --> 00:39:47,276 heart of the Solar System. 541 00:39:49,591 --> 00:39:53,572 We noticed that there was a series of extremely powerful 542 00:39:53,573 --> 00:39:57,740 coronal mass ejections some 400 days before the radio burst. 543 00:39:59,204 --> 00:40:00,770 Checking through Voyager's log, 544 00:40:00,771 --> 00:40:03,487 Gurnett found that it had been overtaken by the outburst 545 00:40:03,488 --> 00:40:05,461 after 100 days. 546 00:40:05,462 --> 00:40:08,328 Ten months later, the solar gust reached some kind 547 00:40:08,329 --> 00:40:10,674 of magnetic boundary. 548 00:40:10,675 --> 00:40:14,842 Was this the heliopause, the outer limit of the solar wind? 549 00:40:15,678 --> 00:40:19,764 So our basic model is that this coronal mass ejection 550 00:40:19,765 --> 00:40:23,642 produced a pulse of plasma that came out from the Sun 551 00:40:23,643 --> 00:40:27,763 and propagated for 400 days; we detected it going by 552 00:40:27,764 --> 00:40:30,051 Voyager I and Voyager II. 553 00:40:30,052 --> 00:40:34,579 And that pulse of plasma eventually reached the heliopause 554 00:40:34,580 --> 00:40:37,760 and caused the radio emission. 555 00:40:37,761 --> 00:40:40,151 The radio burst places the heliopause 556 00:40:40,152 --> 00:40:43,152 at four times the distance of Pluto. 557 00:40:44,111 --> 00:40:47,861 This is how far the power of our Sun extends. 558 00:40:52,087 --> 00:40:55,500 Even the most distant planets, where the Sun appears 559 00:40:55,501 --> 00:40:58,414 as little more than a bright star, 560 00:40:58,415 --> 00:41:01,415 bathe in its evaporating atmosphere. 561 00:41:02,687 --> 00:41:05,984 The planets are bound by the gravity of our Sun. 562 00:41:05,985 --> 00:41:10,128 They were formed as a byproduct of its creation. 563 00:41:10,129 --> 00:41:14,192 On at least one of them, the Sun sustains life. 564 00:41:14,193 --> 00:41:17,477 But our Sun, along with the billions of other stars, 565 00:41:17,478 --> 00:41:19,823 has a more fundamental significance 566 00:41:19,824 --> 00:41:21,157 for the planets. 567 00:41:22,180 --> 00:41:24,763 And this lies at its very core. 568 00:41:29,042 --> 00:41:33,429 The Sun's core is the ultimate nuclear reactor. 569 00:41:33,430 --> 00:41:36,680 Douglas Gough wants to see it in action. 570 00:41:36,681 --> 00:41:40,964 My ultimate goal is mainly to learn about the structure 571 00:41:40,965 --> 00:41:44,993 of the core, because the nuclear physics is so interesting. 572 00:41:44,994 --> 00:41:48,894 The nuclear reactions that change material that produce 573 00:41:48,895 --> 00:41:53,747 new particles that leave the Sun, understanding that 574 00:41:53,748 --> 00:41:56,870 helps us to understand the basic physics 575 00:41:56,871 --> 00:41:58,621 of elementary matter. 576 00:42:06,066 --> 00:42:09,769 1995 saw the launch of a new era of solar 577 00:42:09,770 --> 00:42:13,960 exploration: the start of the journey that may yet take us 578 00:42:13,961 --> 00:42:16,128 to the heart of the stars. 579 00:42:26,358 --> 00:42:31,024 The solar observatory SOHO can view the Sun in x-rays, 580 00:42:31,025 --> 00:42:33,608 ultraviolet, and visible light. 581 00:42:46,188 --> 00:42:49,438 But SOHO carries an additional feature: 582 00:42:52,318 --> 00:42:56,496 in 1975, when Douglas Gough learned that the Sun's surface 583 00:42:56,497 --> 00:42:59,956 rippled like a pond, he instantly saw a way 584 00:42:59,957 --> 00:43:01,707 to see into its core. 585 00:43:04,438 --> 00:43:07,027 What I realized is that this is a way of seeing 586 00:43:07,028 --> 00:43:08,919 inside the Sun. 587 00:43:08,920 --> 00:43:11,775 You can't see inside the Sun with light, 588 00:43:11,776 --> 00:43:13,725 because it's opaque. 589 00:43:13,726 --> 00:43:15,362 But this was really sound. 590 00:43:15,363 --> 00:43:17,383 You could hear inside the Sun. 591 00:43:17,384 --> 00:43:20,227 And by hearing inside the Sun, you could learn what the 592 00:43:20,228 --> 00:43:23,606 structure of the Sun is inside, and this was an amazing 593 00:43:23,607 --> 00:43:27,774 concept for me, that you could actually get inside a star. 594 00:43:28,994 --> 00:43:31,849 The surface of the Sun was heaving. 595 00:43:31,850 --> 00:43:36,017 Every six minutes, the entire star breathes in and out. 596 00:43:37,771 --> 00:43:42,530 Its gaseous ocean swells and dips, and a complex pattern 597 00:43:42,531 --> 00:43:46,558 of ripples shimmers across its surface, providing clues 598 00:43:46,559 --> 00:43:48,892 to the hidden world beneath. 599 00:43:51,273 --> 00:43:54,233 The Sun is like a chorus of people, of instruments, 600 00:43:54,234 --> 00:43:57,042 playing, but not in tune. 601 00:43:57,043 --> 00:43:57,876 They're all very different. 602 00:43:57,877 --> 00:44:00,641 It's cacophonous, which gives us lots of information about 603 00:44:00,642 --> 00:44:02,812 the detailed interior. 604 00:44:02,813 --> 00:44:05,819 The sound waves move back and forth inside the Sun, 605 00:44:05,820 --> 00:44:10,080 and give tones, just like the tones of a musical instrument. 606 00:44:10,081 --> 00:44:14,631 Already, SOHO has revealed new surface phenomena. 607 00:44:14,632 --> 00:44:18,672 In the aftermath of a solar flare, seismic quakes spread 608 00:44:18,673 --> 00:44:21,864 out for thousands of kilometers. 609 00:44:21,865 --> 00:44:24,365 We've learned a great deal about the outside of the Sun 610 00:44:24,366 --> 00:44:28,684 from studying the seismic waves from SOHO. 611 00:44:28,685 --> 00:44:30,286 We've learned about the dynamics. 612 00:44:30,287 --> 00:44:32,875 We've learned about the chemical composition. 613 00:44:32,876 --> 00:44:37,043 Now we want to do something similar in the very core. 614 00:44:37,973 --> 00:44:41,469 SOHO has stripped away the outer layers of the Sun. 615 00:44:43,348 --> 00:44:47,051 Beneath the surface, it has discovered rivers of plasma, 616 00:44:47,052 --> 00:44:50,302 superheated gases that circle its pole. 617 00:44:56,700 --> 00:44:58,835 Looking like a jet stream on Earth, 618 00:44:58,836 --> 00:45:01,669 it seems the Sun has weather, too. 619 00:45:04,618 --> 00:45:08,785 But deep in the core is a remarkable chemical factory. 620 00:45:10,132 --> 00:45:12,604 The stars generate stuff. 621 00:45:12,605 --> 00:45:15,855 They make all the matter that you and I are made of, 622 00:45:15,856 --> 00:45:18,409 from hydrogen and helium, but they make this heavy stuff 623 00:45:18,410 --> 00:45:20,174 that we are made of. 624 00:45:20,175 --> 00:45:23,297 They're the factories that make material. 625 00:45:23,298 --> 00:45:27,430 So to understand the Universe, we need to study the stars. 626 00:45:27,431 --> 00:45:31,598 Every star has a core, almost all stars are generating 627 00:45:33,561 --> 00:45:37,705 nuclear energy, transmuting elements from one to another, 628 00:45:37,706 --> 00:45:39,934 building up the heavy elements, the whole building blocks 629 00:45:39,935 --> 00:45:41,130 of the Universe. 630 00:45:41,131 --> 00:45:43,568 We believe the physics in those stars is the same as the 631 00:45:43,569 --> 00:45:45,019 physics on Earth. 632 00:45:45,020 --> 00:45:47,434 This physics we need to understand more carefully, 633 00:45:47,435 --> 00:45:49,907 so that under extreme conditions we can work out what 634 00:45:49,908 --> 00:45:51,463 that physics implies. 635 00:45:51,464 --> 00:45:54,129 On a very large scale, what it implies about 636 00:45:54,130 --> 00:45:55,079 the structure of the Universe, 637 00:45:55,080 --> 00:45:57,996 and how the whole Universe evolves. 638 00:45:59,166 --> 00:46:01,185 In the beginning, the Universe contained 639 00:46:01,186 --> 00:46:03,269 just hydrogen and helium. 640 00:46:06,120 --> 00:46:09,486 For 12 billion years, stars have been transforming these 641 00:46:09,487 --> 00:46:13,259 simple gases into more complex elements. 642 00:46:13,260 --> 00:46:16,177 Our Sun was born from that process. 643 00:46:20,273 --> 00:46:24,126 Four and a half billion years ago, a massive star on the 644 00:46:24,127 --> 00:46:28,294 fringes of our galaxy ended its existence as a supernova. 645 00:46:34,112 --> 00:46:37,327 Its death throes sent the contents of its core spraying 646 00:46:37,328 --> 00:46:38,995 outwards into space. 647 00:46:41,206 --> 00:46:44,897 These superheated grains of silicon, iron, and many other 648 00:46:44,898 --> 00:46:48,623 elements careered into a neighboring cloud of gas, 649 00:46:48,624 --> 00:46:50,541 causing it to collapse. 650 00:47:04,170 --> 00:47:07,873 As the mixture of gas and dust gravitated towards the center 651 00:47:07,874 --> 00:47:12,354 of the cloud, they ignited a nuclear reaction, and our Sun 652 00:47:12,355 --> 00:47:13,688 burst into life. 653 00:47:17,998 --> 00:47:21,491 Around it, the remaining debris from the supernova combined 654 00:47:21,492 --> 00:47:23,159 to form the planets. 655 00:47:28,215 --> 00:47:32,382 We are made of stardust, forged in the heart of a star. 656 00:47:34,403 --> 00:47:39,243 In the last 400 years, science has peeled back the blinding 657 00:47:39,244 --> 00:47:44,166 layers of our Sun to reveal a star, one of the countless 658 00:47:44,167 --> 00:47:47,602 engines of creation which made the planets, 659 00:47:47,603 --> 00:47:49,103 and which made us. 660 00:48:00,270 --> 00:48:04,353 Our ancestors saw a perfect disc of light; a god. 661 00:48:06,098 --> 00:48:10,485 But modern science has revealed an entity for more complex 662 00:48:10,486 --> 00:48:14,189 and powerful than those ancient humans could ever 663 00:48:14,190 --> 00:48:16,107 have believed possible. 55651

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