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These are the user uploaded subtitles that are being translated: 1 00:00:04,500 --> 00:00:06,280 100 years ago, 2 00:00:06,280 --> 00:00:08,880 Gustav Holst's masterpiece The Planets 3 00:00:08,880 --> 00:00:11,120 premiered at The Queen's Hall in London. 4 00:00:14,960 --> 00:00:17,800 It has since become a favourite on the concert platform. 5 00:00:24,800 --> 00:00:29,520 Holst's inspiration was more astrological than astronomical. 6 00:00:29,520 --> 00:00:32,760 When he composed the seven movement suites, 7 00:00:32,760 --> 00:00:36,880 Holst knew little of the physical nature of the worlds he represented. 8 00:00:41,200 --> 00:00:43,760 But thanks to a century of discovery, 9 00:00:43,760 --> 00:00:45,960 using space probes and rovers, 10 00:00:45,960 --> 00:00:47,880 these are now worlds we've photographed... 11 00:00:47,880 --> 00:00:49,800 Worlds we've touched. 12 00:00:54,560 --> 00:00:58,240 And, yet, Holst's music is just as powerful today, 13 00:00:58,240 --> 00:01:02,720 reminding us of the fragility of humanity, adrift in the universe. 14 00:01:08,200 --> 00:01:09,400 OK. 15 00:01:10,840 --> 00:01:13,280 I've been working with the BBC Symphony Orchestra 16 00:01:13,280 --> 00:01:17,240 and conductor Ben Gernon, exploring the latest science. 17 00:01:20,000 --> 00:01:22,200 The images, I think, are very powerful. 18 00:01:22,200 --> 00:01:23,640 I'll show you an image in a moment 19 00:01:23,640 --> 00:01:25,600 which I think is probably my favourite image 20 00:01:25,600 --> 00:01:27,280 in the history of space exploration. 21 00:01:29,320 --> 00:01:31,560 We want to discover if this new knowledge 22 00:01:31,560 --> 00:01:34,240 can deliver a fresh insight into the music. 23 00:01:37,640 --> 00:01:40,480 Tonight, at a special event at the Barbican, 24 00:01:40,480 --> 00:01:43,000 all seven movements will be performed... 25 00:01:43,960 --> 00:01:48,480 ..this time, set to the backdrop of the latest imagery of the planets. 26 00:01:57,960 --> 00:02:01,840 CROWD APPLAUD 27 00:02:20,800 --> 00:02:24,560 Holst's Planets were characterised by their astrological 28 00:02:24,560 --> 00:02:26,120 and mythological characters. 29 00:02:26,120 --> 00:02:29,680 So, Mars, The Bringer Of War. Venus, The Bringer Of Peace. 30 00:02:29,680 --> 00:02:32,080 Neptune, The Mystic. 31 00:02:32,080 --> 00:02:35,760 The aim of tonight's performance is to explore how the music changes 32 00:02:35,760 --> 00:02:40,080 if we listen today, with the luxury of 100 years of scientific discovery 33 00:02:40,080 --> 00:02:45,800 and, also, if we listen in today's social and political context. 34 00:02:45,800 --> 00:02:50,560 You see, composers like Holst were involved in and contributed 35 00:02:50,560 --> 00:02:54,120 to the political and intellectual arguments of the day. 36 00:02:54,120 --> 00:02:58,760 Holst was on the left of politics, and he was also a spiritual man. 37 00:02:58,760 --> 00:03:01,120 He was interested in eastern philosophy, 38 00:03:01,120 --> 00:03:05,680 he learned Sanskrit, and his music had a strong Indian influence. 39 00:03:06,640 --> 00:03:08,640 While he was writing The Planets, 40 00:03:08,640 --> 00:03:11,880 during the First World War and just before the First World War, 41 00:03:11,880 --> 00:03:16,360 a time of great social, and economic and geo-political instability, 42 00:03:16,360 --> 00:03:19,200 his character, his interests, 43 00:03:19,200 --> 00:03:23,480 and his political ideas are reflected in The Planets. 44 00:03:23,480 --> 00:03:26,320 Precisely how, of course, is open to interpretation. 45 00:03:26,320 --> 00:03:28,760 That is the point of great art. 46 00:03:28,760 --> 00:03:31,880 But an interpretation I find interesting 47 00:03:31,880 --> 00:03:35,040 is that The Planets can be seen as an intellectual journey, 48 00:03:35,040 --> 00:03:37,880 informed by Holst's socialism, 49 00:03:37,880 --> 00:03:40,560 and his attraction to eastern mysticism. 50 00:03:40,560 --> 00:03:43,560 In fact, the director Tony Palmer, in his film on Holst, 51 00:03:43,560 --> 00:03:48,640 wrote that in this context, The Planets begins to make sense. 52 00:03:48,640 --> 00:03:52,560 Not as an astrological chart, a la Mystic Meg, 53 00:03:52,560 --> 00:03:54,560 but as a pilgrim's progress 54 00:03:54,560 --> 00:03:59,280 from the ferocity of industrial capitalism, represented by Mars, 55 00:03:59,280 --> 00:04:04,720 towards a karma of enlightenment, represented by Neptune. 56 00:04:04,720 --> 00:04:07,560 Now, tonight I'm not interested in arguing for this, 57 00:04:07,560 --> 00:04:10,640 or indeed, any other particular interpretation. 58 00:04:10,640 --> 00:04:15,040 What I am interested in is how the work might suggest new ideas 59 00:04:15,040 --> 00:04:18,000 when set in a 21st century context, 60 00:04:18,000 --> 00:04:22,560 alongside the images and the understanding of the solar system 61 00:04:22,560 --> 00:04:24,640 to which we now have access. 62 00:04:29,920 --> 00:04:33,560 This is a modern day spacecraft picture of Mars. 63 00:04:33,560 --> 00:04:36,920 Everywhere we look, we see evidence of rivers. 64 00:04:36,920 --> 00:04:40,040 So Mars, actually, was a world which could have supported life 65 00:04:40,040 --> 00:04:42,280 about 3 billion years ago. 66 00:04:43,400 --> 00:04:47,040 Now we know that there's water on Mars, there are minerals on Mars, 67 00:04:47,040 --> 00:04:49,800 pretty much everything you need to support human life 68 00:04:49,800 --> 00:04:51,280 in a civilisation. 69 00:04:51,280 --> 00:04:54,680 And so Mars becomes not a bringer of war, 70 00:04:54,680 --> 00:04:57,880 kind of a terrifying red object in the sky, 71 00:04:57,880 --> 00:05:00,840 but a bringer of opportunity and hope. 72 00:05:00,840 --> 00:05:03,000 I think it's really interesting. There's a moment... 73 00:05:03,000 --> 00:05:05,720 Actually, in the orchestra, if we could just have a look, please. 74 00:05:05,720 --> 00:05:07,280 And it's four bars before Figure 5. 75 00:05:07,280 --> 00:05:09,240 And I'm wondering if we could just soften this 76 00:05:09,240 --> 00:05:10,920 to make this more hopeful? 77 00:05:10,920 --> 00:05:13,360 This fanfare that we have in the brass, instead of it being 78 00:05:13,360 --> 00:05:15,600 da-da-da-da-da-da-da-da-dee, da-da-dum, 79 00:05:15,600 --> 00:05:17,800 could it be da-da-da-da-da-da-da-da-dee? 80 00:05:17,800 --> 00:05:20,880 So it's ever so slightly softer and, maybe, as you were saying, 81 00:05:20,880 --> 00:05:23,160 Brian, offers a sort of place for hope. 82 00:05:29,800 --> 00:05:33,040 Mars, as Holst would have known it, 83 00:05:33,040 --> 00:05:37,080 was not a well-resolved planet, if you like. 84 00:05:37,080 --> 00:05:40,120 The photograph behind me is a photograph taken by telescope 85 00:05:40,120 --> 00:05:42,800 that was commissioned in 1917, 86 00:05:42,800 --> 00:05:45,400 so, in fact, just after Holst had written the piece. 87 00:05:45,400 --> 00:05:48,320 What you see is a fuzzy blob. 88 00:05:48,320 --> 00:05:51,080 You can see dark markings on the surface. 89 00:05:51,080 --> 00:05:55,600 And at the time, even reputable astronomers mistook those markings 90 00:05:55,600 --> 00:05:58,960 for, perhaps, signs of vegetation. 91 00:05:58,960 --> 00:06:03,960 That image of Mars was dashed when we went there with spacecraft. 92 00:06:03,960 --> 00:06:07,080 The first spacecraft to fly past was in 1965, 93 00:06:07,080 --> 00:06:09,240 the Mariner 4 spacecraft. 94 00:06:09,240 --> 00:06:12,360 And it sent back grainy images of the surface. 95 00:06:12,360 --> 00:06:16,600 President Lyndon Johnson, president at the time, reflected. 96 00:06:16,600 --> 00:06:21,640 He said, "It may be, it just may be, that life as we know it, 97 00:06:21,640 --> 00:06:26,280 "with its humanity, is more unique than we may have thought." 98 00:06:26,280 --> 00:06:30,960 If we move forward to today, a fleet of spacecraft have visited. 99 00:06:30,960 --> 00:06:34,560 The first thing we see is a world of geological giants, 100 00:06:34,560 --> 00:06:39,440 that you see a canyon spanning over half the face of the planet, 101 00:06:39,440 --> 00:06:42,960 which is called the Mariner Valley after the Mariner spacecraft. 102 00:06:42,960 --> 00:06:46,600 The Grand Canyon here on Earth would fit into one of its side channels. 103 00:06:46,600 --> 00:06:49,440 It's also a planet of great volcanoes. 104 00:06:49,440 --> 00:06:52,000 We have good evidence that there were lakes, 105 00:06:52,000 --> 00:06:54,240 possibly even oceans on Mars. 106 00:06:55,440 --> 00:06:56,960 We've landed on Mars. 107 00:06:56,960 --> 00:06:59,600 As I speak, there's a robot called Curiosity, 108 00:06:59,600 --> 00:07:03,720 which is exploring an old dry lake bed. 109 00:07:03,720 --> 00:07:07,120 It's found the signatures of organic molecules, 110 00:07:07,120 --> 00:07:08,960 it's found signatures of minerals 111 00:07:08,960 --> 00:07:11,920 that only form in the presence of standing water. 112 00:07:12,880 --> 00:07:16,160 So we've built a picture up of Mars 113 00:07:16,160 --> 00:07:18,640 that tells us that it was Earth-like 114 00:07:18,640 --> 00:07:21,960 perhaps three and a half billion years ago, 115 00:07:21,960 --> 00:07:23,720 with rivers and oceans and seas. 116 00:07:23,720 --> 00:07:26,200 In a sense, it could have been a living world. 117 00:07:26,200 --> 00:07:29,120 Whether life began there, we don't know. 118 00:07:29,120 --> 00:07:33,360 But what's interesting is that this changes our view of Mars again, 119 00:07:33,360 --> 00:07:36,600 because a planet like Mars that had water, 120 00:07:36,600 --> 00:07:40,080 and still has water, becomes a planet that has everything you need 121 00:07:40,080 --> 00:07:45,720 to build a civilisation, to sustain life, to sustain human beings. 122 00:07:45,720 --> 00:07:50,920 So even if there weren't Martians three and a half billion years ago, 123 00:07:50,920 --> 00:07:55,480 even if there aren't still Martian microbes today living sub-surface, 124 00:07:55,480 --> 00:07:58,520 there will probably one day be Martians, 125 00:07:58,520 --> 00:08:01,400 because the Martians will be us. 126 00:08:01,400 --> 00:08:03,800 Can we listen to Holst's Mars 127 00:08:03,800 --> 00:08:07,960 and forget the deeply ingrained 20th century symbolism 128 00:08:07,960 --> 00:08:09,880 of mechanised warfare? 129 00:08:09,880 --> 00:08:13,120 Can we instead view Mars with optimism? 130 00:08:13,120 --> 00:08:16,800 Having survived the barbarism of the 20th century, 131 00:08:16,800 --> 00:08:19,440 our technology and our rockets are now free 132 00:08:19,440 --> 00:08:22,960 to deliver perspective on our cosmic isolation, 133 00:08:22,960 --> 00:08:25,400 to provide a bridge to the future 134 00:08:25,400 --> 00:08:29,000 where humanity is no longer confined to a single world. 135 00:08:36,320 --> 00:08:39,120 MUSIC: Mars, The Bringer of War by Gustav Holst 136 00:15:49,160 --> 00:15:50,800 CROWD APPLAUDS 137 00:15:50,800 --> 00:15:56,040 I think the photographs of Holst speak to me about the time. 138 00:15:56,040 --> 00:15:58,080 So he was late-thirties, 139 00:15:58,080 --> 00:16:01,320 40 or so when he wrote The Planets. Mm-hmm. 140 00:16:01,320 --> 00:16:04,200 But Holst didn't have so much success as a composer 141 00:16:04,200 --> 00:16:05,840 before he wrote this piece. 142 00:16:05,840 --> 00:16:09,480 I often get the impression that he was searching for something deeper 143 00:16:09,480 --> 00:16:12,920 and more meaningful than his current existence. 144 00:16:14,520 --> 00:16:17,240 The First World War was on the horizon. 145 00:16:17,240 --> 00:16:20,520 He wanted to sign up, he couldn't sign up, because he was ill. 146 00:16:20,520 --> 00:16:26,080 He will have friends and colleagues go and fight on the Front, 147 00:16:26,080 --> 00:16:28,160 potentially never come home. 148 00:16:28,160 --> 00:16:30,000 The historical context 149 00:16:30,000 --> 00:16:33,640 within which this piece was written is frightening. 150 00:16:33,640 --> 00:16:37,520 We didn't know there was an origin to the universe. 151 00:16:37,520 --> 00:16:39,680 We didn't know how the sun shone, 152 00:16:39,680 --> 00:16:41,760 so we didn't know about nuclear physics. 153 00:16:41,760 --> 00:16:44,840 So all those things that we almost take for granted now... 154 00:16:44,840 --> 00:16:48,240 ..we'd not known. That's what's interesting. 155 00:16:48,240 --> 00:16:51,640 This is music from a time when we had no idea 156 00:16:51,640 --> 00:16:54,760 about our place in the wider universe. 157 00:16:54,760 --> 00:16:56,120 And I'm intrigued to know, 158 00:16:56,120 --> 00:16:58,640 so if Holst was standing in his back garden at night, 159 00:16:58,640 --> 00:17:00,640 what could he see in the sky? 160 00:17:00,640 --> 00:17:05,560 With the naked eye, he would've been able to see Venus, of course. 161 00:17:05,560 --> 00:17:09,400 I mean, Venus is often, depending on where it is in its orbit, 162 00:17:09,400 --> 00:17:12,040 but often the brightest thing in the sky, 163 00:17:12,040 --> 00:17:15,480 either close to sunset or close to sunrise. 164 00:17:15,480 --> 00:17:17,400 It's always close to the sun. 165 00:17:17,400 --> 00:17:21,320 So he would have seen Venus very bright, Jupiter, Saturn, 166 00:17:21,320 --> 00:17:23,000 Mars, again extremely bright. 167 00:17:23,000 --> 00:17:25,040 But that's pretty much it. Mmm. 168 00:17:25,040 --> 00:17:27,680 CROWD APPLAUDS 169 00:17:29,640 --> 00:17:33,160 Venus, The Bringer Of Peace. 170 00:17:33,160 --> 00:17:36,640 It's a planet that's very Earth-like in many ways. 171 00:17:36,640 --> 00:17:42,080 It's not too much closer to the sun. It's about the same size as Earth. 172 00:17:42,080 --> 00:17:45,760 And this really led astronomers in Holst's time 173 00:17:45,760 --> 00:17:48,880 to consider it potentially Earth's twin. 174 00:17:48,880 --> 00:17:53,280 Just like Mars, it was considered to be a world which may harbour life. 175 00:17:53,280 --> 00:17:57,160 We can never see the ground from Earth, it's shrouded in clouds. 176 00:17:57,160 --> 00:17:59,360 And that added, I think, to this idea 177 00:17:59,360 --> 00:18:02,520 that Venus may be a tropical paradise. 178 00:18:02,520 --> 00:18:05,280 But as with Mars, you know, we had a shock 179 00:18:05,280 --> 00:18:06,960 when we first started to point, 180 00:18:06,960 --> 00:18:09,960 initially, radio telescopes to Venus, 181 00:18:09,960 --> 00:18:13,160 and then began to fly space probes past the planet. 182 00:18:13,160 --> 00:18:18,480 We found that Venus is a scorched world. 183 00:18:18,480 --> 00:18:23,400 This is a photograph from a Russian spacecraft called Venera 9, 184 00:18:23,400 --> 00:18:25,600 which landed in 1975. 185 00:18:25,600 --> 00:18:28,360 It found a world that it could barely survive. 186 00:18:28,360 --> 00:18:30,440 It only lasted for around an hour. 187 00:18:30,440 --> 00:18:35,720 It measured temperatures of 465 degrees Celsius on the surface. 188 00:18:35,720 --> 00:18:41,040 The atmospheric pressure is 90 times the atmospheric pressure on Earth. 189 00:18:41,040 --> 00:18:43,680 That means if you or I stood on Venus, 190 00:18:43,680 --> 00:18:46,480 we would be toasted and then squashed. 191 00:18:46,480 --> 00:18:49,360 And if that didn't do it for us, we would be dissolved, 192 00:18:49,360 --> 00:18:53,280 because the clouds of Venus rain down sulphuric acid. 193 00:18:53,280 --> 00:18:57,880 So, far from being an idyllic, beautiful bringer of peace, 194 00:18:57,880 --> 00:18:59,520 the goddess of love, 195 00:18:59,520 --> 00:19:03,360 Venus is the closest world to hell you could imagine. 196 00:19:03,360 --> 00:19:05,400 AUDIENCE LAUGHS 197 00:19:05,400 --> 00:19:09,240 Then we started peering through the clouds using radar, 198 00:19:09,240 --> 00:19:12,760 and we see a surface that is covered in volcanoes, 199 00:19:12,760 --> 00:19:17,360 far more volcanoes than any other planet in the solar system. 200 00:19:17,360 --> 00:19:21,280 What's interesting, though, is that it seems that, again, 201 00:19:21,280 --> 00:19:25,040 like Mars, Venus would have had water on the surface, 202 00:19:25,040 --> 00:19:30,120 may have been a habitable world, may even have given rise to life, 203 00:19:30,120 --> 00:19:32,280 may have been that paradise. 204 00:19:32,280 --> 00:19:34,840 But something went wrong on Venus. 205 00:19:34,840 --> 00:19:39,280 Those volcanoes pumped carbon dioxide, sulphur dioxide, 206 00:19:39,280 --> 00:19:41,960 greenhouse gasses into the atmosphere. 207 00:19:41,960 --> 00:19:45,240 The cycles of the planet ran away with themselves. 208 00:19:45,240 --> 00:19:48,680 A runaway greenhouse effect heated the planet up 209 00:19:48,680 --> 00:19:53,240 and destroyed it, certainly as a habitable world. 210 00:19:53,240 --> 00:19:59,640 So I think the lesson of Venus is that planets are not eternal. 211 00:19:59,640 --> 00:20:02,600 A world that was once heaven can become hell. 212 00:20:02,600 --> 00:20:08,560 Venus, Bringer Of Peace, becomes a requiem for a failed planet, 213 00:20:08,560 --> 00:20:14,840 and perhaps also a reflection on how rare places like Earth might be. 214 00:20:18,680 --> 00:20:24,080 MUSIC: Venus, Bringer Of Peace by Gustav Holst 215 00:28:34,360 --> 00:28:36,520 It is a vision of hell. 216 00:28:36,520 --> 00:28:39,440 And I think that's fascinating when you set it against the music. 217 00:28:39,440 --> 00:28:43,080 I think that this idea that there are just small falling motifs 218 00:28:43,080 --> 00:28:45,400 and there's a couple of solos in the orchestra as well, 219 00:28:45,400 --> 00:28:46,920 so, really as a listener, 220 00:28:46,920 --> 00:28:51,320 you're drawn into extremely personal and lonely sounds. 221 00:28:51,320 --> 00:28:54,680 And then the piece ends with just the second violins playing. 222 00:28:54,680 --> 00:28:57,720 A very long diminuendo, suspended high note, 223 00:28:57,720 --> 00:29:00,320 and you are left with this sense of loss. 224 00:29:00,320 --> 00:29:05,200 I'm sure Holst did not intend Venus to be listened to that way. 225 00:29:05,200 --> 00:29:09,080 How do you feel about that re-interpretation? 226 00:29:09,080 --> 00:29:12,320 Erm, so I find this layering fascinating because, you know, 227 00:29:12,320 --> 00:29:17,000 human beings aren't just 1-D things that write seven notes on the page 228 00:29:17,000 --> 00:29:20,240 and it forever means that it's locked in history. 229 00:29:20,240 --> 00:29:22,840 It's almost as if he had a weird premonition 230 00:29:22,840 --> 00:29:26,160 of what was to come, in terms of some of the research as well, 231 00:29:26,160 --> 00:29:30,200 because how can it be that this music is so easily transformed? 232 00:29:30,200 --> 00:29:32,040 And it sort of adds to the more mystical 233 00:29:32,040 --> 00:29:34,960 and mysterious side to his character and what he wrote. 234 00:29:37,520 --> 00:29:40,760 Mercury, The Winged Messenger. 235 00:29:40,760 --> 00:29:43,600 There are spacecraft whose job it is to observe the sun, 236 00:29:43,600 --> 00:29:46,640 and one of them is called the Solar Dynamics Observatory. 237 00:29:46,640 --> 00:29:50,920 It just sort of sits there and looks for solar flares and solar storms, 238 00:29:50,920 --> 00:29:52,960 watching how the sun behaves. 239 00:29:52,960 --> 00:29:58,120 But occasionally, the spacecraft capture something quite magical. 240 00:29:58,120 --> 00:30:01,280 They capture what's called a transit of Mercury, 241 00:30:01,280 --> 00:30:06,760 a small black dot, tracing its way across the face of the star. 242 00:30:06,760 --> 00:30:10,240 Now, Mercury zips around the sun very fast. 243 00:30:10,240 --> 00:30:14,960 "The Winged Messenger" is a rather nice title 244 00:30:14,960 --> 00:30:20,040 because it's very close to the sun, but very difficult to get to. 245 00:30:20,040 --> 00:30:24,440 The Mercury Messenger spacecraft, it took seven years to get to Mercury. 246 00:30:24,440 --> 00:30:27,680 It had to fly around the Earth once, then go round Venus twice 247 00:30:27,680 --> 00:30:29,960 and then round Mercury three times 248 00:30:29,960 --> 00:30:33,160 before it had slowed down enough to get into orbit. 249 00:30:33,160 --> 00:30:37,880 What it found was a world that... Well, we knew it would be hot. 250 00:30:37,880 --> 00:30:40,480 It's close to the sun. It's about 430 degrees Celsius 251 00:30:40,480 --> 00:30:42,120 by day on the surface. 252 00:30:42,120 --> 00:30:44,560 However, because there's no atmosphere on Mercury, 253 00:30:44,560 --> 00:30:48,720 it drops to about minus 180 degrees Celsius at night, 254 00:30:48,720 --> 00:30:51,560 so it's a world of extremes. 255 00:30:51,560 --> 00:30:54,920 Messenger found traces of what astronomers called 256 00:30:54,920 --> 00:30:56,320 "volatiles" on the surface, 257 00:30:56,320 --> 00:30:58,040 things like potassium. 258 00:30:58,040 --> 00:30:59,800 Now, that's interesting, 259 00:30:59,800 --> 00:31:03,520 because potassium is only expected to be found on planets 260 00:31:03,520 --> 00:31:06,320 that form further out in the solar system. 261 00:31:06,320 --> 00:31:08,240 They're called volatiles for a reason. 262 00:31:08,240 --> 00:31:11,280 They boil away when they're close to the sun. 263 00:31:11,280 --> 00:31:16,680 So we now think that Mercury formed much further away from the sun 264 00:31:16,680 --> 00:31:19,880 than the position where it orbits today. 265 00:31:19,880 --> 00:31:23,360 So again, the Winged Messenger seems to be rather apt. 266 00:31:23,360 --> 00:31:26,920 Mercury has shifted a great deal in its orbit 267 00:31:26,920 --> 00:31:29,880 during the history of the solar system and, in fact, 268 00:31:29,880 --> 00:31:33,200 our simulations suggest that it's at least possible 269 00:31:33,200 --> 00:31:37,960 that Mercury will shift again and fly out into the outer solar system, 270 00:31:37,960 --> 00:31:42,240 perhaps even be lost into interstellar space. 271 00:31:42,240 --> 00:31:47,040 So Mercury illustrates another important point. 272 00:31:47,040 --> 00:31:51,240 The solar system is not a piece of eternal clockwork 273 00:31:51,240 --> 00:31:57,080 crafted by the gods, but a dynamic living and evolving place. 274 00:32:01,920 --> 00:32:05,400 MUSIC: Mercury, The Winged Messenger by Gustav Holst 275 00:36:12,480 --> 00:36:16,840 Jupiter is a dominant planet in the solar system, in a sense. 276 00:36:16,840 --> 00:36:20,600 It's two and a half times the mass of all the other planets 277 00:36:20,600 --> 00:36:22,560 and moons combined. 278 00:36:22,560 --> 00:36:24,800 And that means that it's really the only object 279 00:36:24,800 --> 00:36:27,040 in the solar system, other than the sun, 280 00:36:27,040 --> 00:36:30,440 that has a quite profound gravitational influence 281 00:36:30,440 --> 00:36:32,400 on the rest of the system. 282 00:36:32,400 --> 00:36:36,680 For example, the asteroid that wiped out the dinosaurs 283 00:36:36,680 --> 00:36:40,120 here on Earth 66 million years ago is likely, 284 00:36:40,120 --> 00:36:43,680 or at least it's possible, that it was deflected 285 00:36:43,680 --> 00:36:47,520 on to a collision course with Earth by Jupiter. 286 00:36:47,520 --> 00:36:52,320 Jupiter is a creator and destroyer of worlds. 287 00:36:52,320 --> 00:36:56,080 Now, we have a spacecraft in orbit around Jupiter now called Juno, 288 00:36:56,080 --> 00:37:01,000 which is sending back the most remarkable images of the planet. 289 00:37:01,000 --> 00:37:03,360 It's a spacecraft that, for the first time, 290 00:37:03,360 --> 00:37:06,240 orbits the north and south pole of Jupiter. 291 00:37:06,240 --> 00:37:08,680 When you zoom in, you see images of clouds 292 00:37:08,680 --> 00:37:11,720 that look almost like Impressionist paintings. 293 00:37:11,720 --> 00:37:15,160 The storm that we're probably most aware of on Jupiter 294 00:37:15,160 --> 00:37:16,600 is the Great Red Spot. 295 00:37:16,600 --> 00:37:20,960 But it is shrinking, so when Galileo saw the storm system, 296 00:37:20,960 --> 00:37:24,120 you could have lined up three Earths in that spot. 297 00:37:24,120 --> 00:37:26,960 Gives you a sense of scale of Jupiter. Now it's shrunk, 298 00:37:26,960 --> 00:37:30,000 you could only fit about two Earths across the diameter. 299 00:37:30,000 --> 00:37:33,440 But it's still a big and long-lived storm. 300 00:37:33,440 --> 00:37:36,600 Jupiter is a fascinating world in itself, 301 00:37:36,600 --> 00:37:40,120 but equally fascinating is its own mini solar system, 302 00:37:40,120 --> 00:37:42,480 its moons, over 70 moons. 303 00:37:42,480 --> 00:37:47,280 And the four brightest were discovered by Galileo. 304 00:37:47,280 --> 00:37:50,320 These moons played an extremely important role 305 00:37:50,320 --> 00:37:52,320 in the history of human thought, 306 00:37:52,320 --> 00:37:55,200 because they confirmed to Galileo 307 00:37:55,200 --> 00:37:58,080 that we are not the centre of the universe. 308 00:37:58,080 --> 00:38:00,480 Because when you look at Jupiter through a telescope, 309 00:38:00,480 --> 00:38:05,720 it's obvious that those moons are in orbit around it and not around us. 310 00:38:05,720 --> 00:38:09,400 Those moons are worlds with their own characters. 311 00:38:09,400 --> 00:38:14,800 Io is the most volcanically active body in the solar system. 312 00:38:14,800 --> 00:38:18,240 And then, a rather magical world called Europa, 313 00:38:18,240 --> 00:38:22,600 a moon covered in a shell of frozen water ice. 314 00:38:22,600 --> 00:38:25,880 But we know that beneath that shell of water ice, 315 00:38:25,880 --> 00:38:29,520 there is an ocean of liquid salt-water. 316 00:38:29,520 --> 00:38:34,400 It contains more water than all the oceans of the Earth combined. 317 00:38:34,400 --> 00:38:38,320 And so Europa may well be a home for life. 318 00:38:39,680 --> 00:38:42,360 Now, we've got our first pictures of the planet, 319 00:38:42,360 --> 00:38:46,560 and particularly the moons, from two iconic spacecraft, 320 00:38:46,560 --> 00:38:49,040 Voyager 1 and Voyager 2. 321 00:38:49,040 --> 00:38:52,160 These spacecraft were launched in 1977. 322 00:38:52,160 --> 00:38:54,800 They arrived at Jupiter in 1979. 323 00:38:54,800 --> 00:38:57,640 We are still in touch with them both today, 324 00:38:57,640 --> 00:39:00,200 41 years after they were launched. 325 00:39:00,200 --> 00:39:06,080 Voyager 1 is 13.3 billion miles away from Earth in interstellar space. 326 00:39:06,080 --> 00:39:08,000 It's a tiny little thing. 327 00:39:08,000 --> 00:39:10,240 I want to show you this photograph of me 328 00:39:10,240 --> 00:39:14,200 standing in front of a scale model of it at JPL in California. 329 00:39:14,200 --> 00:39:16,680 It's a remarkable engineering achievement. 330 00:39:16,680 --> 00:39:21,440 On Valentine's Day, 1990, as it was on its way out of the solar system, 331 00:39:21,440 --> 00:39:24,760 it took what I think is the most famous image, 332 00:39:24,760 --> 00:39:27,800 certainly of Earth, in the history of space exploration, 333 00:39:27,800 --> 00:39:30,840 when it was 4 billion miles from home. 334 00:39:30,840 --> 00:39:33,480 It's called the Pale Blue Dot image. 335 00:39:33,480 --> 00:39:36,320 Now, there are coloured stripes crossing the image, 336 00:39:36,320 --> 00:39:37,960 which are lens flare. 337 00:39:37,960 --> 00:39:40,200 But if you look carefully in the red stripe, 338 00:39:40,200 --> 00:39:44,240 you'll see a point of light, which is our planet, the Earth, 339 00:39:44,240 --> 00:39:45,840 the Pale Blue Dot. 340 00:39:45,840 --> 00:39:48,320 Carl Sagan, who's one of my great heroes, 341 00:39:48,320 --> 00:39:51,920 wrote a very powerful piece of prose about this image, 342 00:39:51,920 --> 00:39:55,440 reflecting on what it tells us about our place in the universe. 343 00:39:55,440 --> 00:39:57,680 "The Earth," he wrote, 344 00:39:57,680 --> 00:40:01,920 "..is a very small stage in a vast cosmic arena. 345 00:40:01,920 --> 00:40:05,800 "Think of the rivers of blood spilled by all those generals 346 00:40:05,800 --> 00:40:09,920 "and emperors so that in glory and in triumph, 347 00:40:09,920 --> 00:40:14,640 "they could become the momentary masters of a fraction of a dot. 348 00:40:14,640 --> 00:40:16,960 "Think of the endless cruelties visited 349 00:40:16,960 --> 00:40:20,440 "by the inhabitants of one corner of this dot 350 00:40:20,440 --> 00:40:24,120 "on the scarcely distinguishable inhabitants 351 00:40:24,120 --> 00:40:26,840 "of some other corner of the dot. 352 00:40:26,840 --> 00:40:29,000 "How frequent their misunderstandings, 353 00:40:29,000 --> 00:40:31,400 "how eager they are to kill one another. 354 00:40:31,400 --> 00:40:33,600 "How fervent their hatreds. 355 00:40:33,600 --> 00:40:36,720 "Our posturings, our imagined self-importance, 356 00:40:36,720 --> 00:40:41,280 "the delusion that we have some privileged position in the universe 357 00:40:41,280 --> 00:40:45,520 "are challenged by this point of pale light." 358 00:40:45,520 --> 00:40:49,560 This idea that Jupiter might represent humility, 359 00:40:49,560 --> 00:40:51,920 they're the beginnings of the realisation 360 00:40:51,920 --> 00:40:56,560 that we are perhaps more fragile, smaller, and more interdependent, 361 00:40:56,560 --> 00:40:59,680 both with each other and the wider universe, 362 00:40:59,680 --> 00:41:01,960 than we often like to imagine. 363 00:41:01,960 --> 00:41:06,320 I find fascinating, in the context of tonight's performance, 364 00:41:06,320 --> 00:41:08,400 that Holst's Jupiter, after all, 365 00:41:08,400 --> 00:41:12,320 contains one of the most well-known passages in classical music, 366 00:41:12,320 --> 00:41:15,680 the lyrical section that became the patriotic hymn 367 00:41:15,680 --> 00:41:18,200 I Vow To Thee, My Country. 368 00:41:18,200 --> 00:41:22,480 Patriotism. The love of country. These are important ideas. 369 00:41:22,480 --> 00:41:24,800 They were important to Holst. 370 00:41:24,800 --> 00:41:30,000 But so, too, is the idea that we are one civilisation 371 00:41:30,000 --> 00:41:33,160 living together precariously on one planet 372 00:41:33,160 --> 00:41:37,360 in an ever-changing and always-challenging universe. 373 00:41:37,360 --> 00:41:41,840 If we are to avoid Sagan's endless cruelties of history, 374 00:41:41,840 --> 00:41:45,600 we must find a way to reconcile our affection for our countries 375 00:41:45,600 --> 00:41:49,400 with our responsibility to protect our home world 376 00:41:49,400 --> 00:41:51,360 by working together. 377 00:41:51,360 --> 00:41:53,840 It's my view that the exploration of space 378 00:41:53,840 --> 00:41:57,040 has helped deliver this perspective. 379 00:41:57,040 --> 00:42:01,800 CROWD APPLAUDS 380 00:42:07,240 --> 00:42:11,160 MUSIC: Jupiter, The Bringer Of Jollity by Gustav Holst 381 00:49:44,920 --> 00:49:47,760 CROWD APPLAUDS 382 00:50:00,760 --> 00:50:02,400 And what I think is really interesting is, 383 00:50:02,400 --> 00:50:05,040 in terms of all the planets and all of the movements, 384 00:50:05,040 --> 00:50:07,680 this is the one planet that has the most important 385 00:50:07,680 --> 00:50:11,520 and emotional journey where you have the physical decay of death 386 00:50:11,520 --> 00:50:14,480 at the beginning, and then of serene acceptance. 387 00:50:14,480 --> 00:50:15,680 That's a good point. 388 00:50:15,680 --> 00:50:18,880 I mean, I could show so many pictures from the Cassini spacecraft 389 00:50:18,880 --> 00:50:21,680 which was in orbit around Saturn for a long time. 390 00:50:21,680 --> 00:50:24,480 The interesting thing about this ring system 391 00:50:24,480 --> 00:50:27,960 that we learnt recently is that it's extremely young, 392 00:50:27,960 --> 00:50:31,400 probably only tens of millions of years old, 393 00:50:31,400 --> 00:50:35,080 a dynamic world that's changed radically over... 394 00:50:35,080 --> 00:50:38,920 in a fraction, the blink of an eye in geological time. 395 00:50:38,920 --> 00:50:42,200 And I think how this fits in is maybe the serene acceptance 396 00:50:42,200 --> 00:50:44,640 could be a sense or renewal and rebirth 397 00:50:44,640 --> 00:50:48,280 and things growing and things not dying. 398 00:50:50,320 --> 00:50:52,960 Saturn, The Bringer Of Old Age. 399 00:50:52,960 --> 00:50:56,000 Saturn is, I suppose, the most iconic planet, 400 00:50:56,000 --> 00:50:58,840 made famous by its ring system. 401 00:50:58,840 --> 00:51:04,120 They are an intricate system, beautifully complex, 402 00:51:04,120 --> 00:51:06,800 made of a very simple thing - ice, 403 00:51:06,800 --> 00:51:12,040 water ice sprinkled around the planet. Snowflakes, if you like. 404 00:51:12,040 --> 00:51:14,480 A friend of mine who worked on the Cassini probe, 405 00:51:14,480 --> 00:51:17,280 which has taken the most spectacular images of Saturn, 406 00:51:17,280 --> 00:51:21,200 said that it's like, you know when you get a magnet 407 00:51:21,200 --> 00:51:24,480 and sprinkle iron filings over it, and you can see the magnetic field? 408 00:51:24,480 --> 00:51:27,760 Well, in the same way, it's like some deity 409 00:51:27,760 --> 00:51:30,400 has sprinkled snowflakes over Saturn 410 00:51:30,400 --> 00:51:33,040 so you can see the gravitational field. 411 00:51:33,040 --> 00:51:38,160 Its rings, they look impossibly thin and they are impossibly thin. 412 00:51:38,160 --> 00:51:41,960 They're, in fact, only around ten metres thick, 413 00:51:41,960 --> 00:51:46,160 so they would fit comfortably inside this auditorium. 414 00:51:46,160 --> 00:51:51,960 And they also, we've found, are most likely young. 415 00:51:51,960 --> 00:51:56,360 What we think happened was that a moon came close to the planets, 416 00:51:56,360 --> 00:51:58,440 probably in collision with another moon, 417 00:51:58,440 --> 00:52:01,600 or perhaps a gravitational interaction with another moon, 418 00:52:01,600 --> 00:52:05,720 and then dissociated and broke up to form the rings. 419 00:52:05,720 --> 00:52:07,880 It's possible that they weren't there 420 00:52:07,880 --> 00:52:10,160 when the dinosaurs were on Earth. 421 00:52:10,160 --> 00:52:12,800 So if the dinosaurs had invented telescopes 422 00:52:12,800 --> 00:52:14,760 and looked up at Saturn, 423 00:52:14,760 --> 00:52:19,080 they may well not have seen that planet that we see today. 424 00:52:20,080 --> 00:52:24,400 Saturn has one of the largest moons in the solar system, Titan, 425 00:52:24,400 --> 00:52:28,840 which, in this image, you see above the ring plane. 426 00:52:30,040 --> 00:52:33,080 Titan is the only object in the solar system, 427 00:52:33,080 --> 00:52:36,000 other than Earth, that has liquid on its surface. 428 00:52:36,000 --> 00:52:37,840 But it's freezing cold, 429 00:52:37,840 --> 00:52:41,840 a long way from the sun, minus 180 degrees Celsius or so. 430 00:52:41,840 --> 00:52:45,480 So that liquid is not water. It's liquid methane. 431 00:52:45,480 --> 00:52:47,360 Liquefied natural gas. 432 00:52:47,360 --> 00:52:52,320 So this moon has lakes and seas and rivers of methane. 433 00:52:52,320 --> 00:52:54,840 It has methane rain and methane snow. 434 00:52:54,840 --> 00:52:56,680 A methanological cycle, 435 00:52:56,680 --> 00:53:00,680 in the same way that Earth has a hydrological cycle. 436 00:53:00,680 --> 00:53:04,600 We also think that it may have liquid water below the surface, 437 00:53:04,600 --> 00:53:09,480 so, again, this is an interesting moon in the context of life. 438 00:53:09,480 --> 00:53:13,280 But there is another moon around Saturn that is equally, 439 00:53:13,280 --> 00:53:15,560 even perhaps more intriguing. 440 00:53:15,560 --> 00:53:17,760 It's a moon called Enceladus. 441 00:53:17,760 --> 00:53:21,040 What we see on Enceladus are fountains of ice 442 00:53:21,040 --> 00:53:25,720 rising up from the surface and disappearing off into space. 443 00:53:25,720 --> 00:53:29,520 Beautiful, but what we think is causing those fountains 444 00:53:29,520 --> 00:53:31,200 is even more beautiful. 445 00:53:31,200 --> 00:53:33,640 We are now, I would say, certain 446 00:53:33,640 --> 00:53:38,520 that there are lakes of liquid water below the surface of Enceladus. 447 00:53:38,520 --> 00:53:43,600 And on the floors of those lakes, we think there are geological systems. 448 00:53:43,600 --> 00:53:46,240 Systems called hydrothermal vents. 449 00:53:46,240 --> 00:53:48,280 Now, that is fascinating 450 00:53:48,280 --> 00:53:52,000 because we think that one of the prime candidates 451 00:53:52,000 --> 00:53:55,560 for the origin of life on Earth 3.8 billion years ago 452 00:53:55,560 --> 00:53:58,080 are hydrothermal vent systems, 453 00:53:58,080 --> 00:54:03,520 where you get energy in contact with rock, in contact with minerals, 454 00:54:03,520 --> 00:54:05,920 and that transition from geo-chemistry 455 00:54:05,920 --> 00:54:07,760 to biochemistry happened. 456 00:54:07,760 --> 00:54:10,600 So this moon is one of the prime candidates 457 00:54:10,600 --> 00:54:14,640 to look for life beyond Earth in the solar system. 458 00:54:14,640 --> 00:54:16,480 And when we look at images of Saturn, 459 00:54:16,480 --> 00:54:18,960 which are backlit by the sun, 460 00:54:18,960 --> 00:54:21,400 you see the sunlight illuminating the rings. 461 00:54:21,400 --> 00:54:25,440 There's a diffuse ring far away from Saturn known as the E Ring, 462 00:54:25,440 --> 00:54:29,320 which is created by the ice fountains of Enceladus. 463 00:54:29,320 --> 00:54:33,960 So it's a tiny moon, but with a potentially dramatic impact, 464 00:54:33,960 --> 00:54:37,320 in terms of the creation of the rings, but also philosophically, 465 00:54:37,320 --> 00:54:40,440 intellectually, as a possible home for life. 466 00:54:40,440 --> 00:54:46,000 So, Saturn, The Bringer Of Old Age, in Holst's mind, 467 00:54:46,000 --> 00:54:49,600 is not a world enjoying a sedate old age. 468 00:54:49,600 --> 00:54:51,400 It's a dynamic world, 469 00:54:51,400 --> 00:54:55,520 a fast-changing system, constantly rejuvenating, 470 00:54:55,520 --> 00:54:58,320 raging against the dying of the light. 471 00:54:58,320 --> 00:55:01,720 And its moons, in particular tiny Enceladus, 472 00:55:01,720 --> 00:55:07,480 are perhaps engaged in the most spectacular rejuvenation of all. 473 00:55:07,480 --> 00:55:10,640 That natural transformation of rock and minerals and water 474 00:55:10,640 --> 00:55:13,520 and heat into living matter. 475 00:55:13,520 --> 00:55:17,440 They're the transition from geo-chemistry to biochemistry 476 00:55:17,440 --> 00:55:19,880 that brings meaning to the universe. 477 00:55:25,360 --> 00:55:31,560 MUSIC: Saturn, the Bringer of Old Age by Gustav Holst 478 01:03:59,440 --> 01:04:03,840 CROWD APPLAUD 479 01:04:03,840 --> 01:04:09,120 We are now entering the mysterious dark frontier of the solar system. 480 01:04:09,120 --> 01:04:11,480 Uranus, the Magician. 481 01:04:11,480 --> 01:04:16,080 These worlds would have been absolutely unfamiliar to Holst. 482 01:04:16,080 --> 01:04:20,680 No more than points of light, because they are so far away. 483 01:04:20,680 --> 01:04:22,120 When we look at Uranus 484 01:04:22,120 --> 01:04:25,400 through our most powerful telescopes on Earth, 485 01:04:25,400 --> 01:04:30,360 and here you see it through The VLT, the Very Large Telescope... 486 01:04:30,360 --> 01:04:32,160 It's powerful. 487 01:04:32,160 --> 01:04:37,040 ..we see that it's a planet you can see some surface features. 488 01:04:37,040 --> 01:04:40,960 It's a blue planet with white, high altitude clouds. 489 01:04:40,960 --> 01:04:45,440 And also, four moons are visible in this VLT image. 490 01:04:45,440 --> 01:04:49,680 The image looks odd, though, because the moons are aligned vertically. 491 01:04:49,680 --> 01:04:52,560 The planet appears to be tipped up on its side. 492 01:04:52,560 --> 01:04:54,520 And that's because it is. 493 01:04:54,520 --> 01:04:58,480 That's one of the most mysterious things about Uranus, 494 01:04:58,480 --> 01:05:02,240 it orbits the sun with its poles leading the way. 495 01:05:02,240 --> 01:05:03,480 Now, why? 496 01:05:03,480 --> 01:05:08,120 It's almost certain that Uranus must have been hit by a large planet 497 01:05:08,120 --> 01:05:10,840 at some point in the very distant past, 498 01:05:10,840 --> 01:05:12,480 four and a half billion years ago 499 01:05:12,480 --> 01:05:16,200 during the formation of the solar system, which tipped it over. 500 01:05:16,200 --> 01:05:18,640 Also from Earth-based telescopes, 501 01:05:18,640 --> 01:05:20,920 we can see that Uranus has a ring system. 502 01:05:20,920 --> 01:05:23,400 It's nowhere near as spectacular as Saturn's rings, 503 01:05:23,400 --> 01:05:26,600 but they're rings, nonetheless. 504 01:05:26,600 --> 01:05:29,840 Sunlight out there is only 1/400th 505 01:05:29,840 --> 01:05:32,720 of the intensity of sunlight here on Earth. 506 01:05:32,720 --> 01:05:38,800 Temperatures are very low, the cloud tops are minus 224 degrees Celsius. 507 01:05:38,800 --> 01:05:41,200 But there are very powerful winds there. 508 01:05:41,200 --> 01:05:45,120 The winds at the equator move at 200mph, 509 01:05:45,120 --> 01:05:48,760 but in the opposite direction to its spin. Very strange. 510 01:05:48,760 --> 01:05:51,600 But as you move up to the tropics, towards the poles, 511 01:05:51,600 --> 01:05:57,480 the winds reverse direction and blow in excess of 500mph. 512 01:05:57,480 --> 01:06:00,520 The moons are beautifully named, actually. 513 01:06:00,520 --> 01:06:03,400 They're named after Shakespearian spirits 514 01:06:03,400 --> 01:06:05,400 and spirits in English literature. 515 01:06:05,400 --> 01:06:08,280 So Umbriel, Ariel, Miranda. 516 01:06:08,280 --> 01:06:13,120 Now, the only spacecraft to make it this far out was Voyager 2. 517 01:06:13,120 --> 01:06:14,360 The photographs, 518 01:06:14,360 --> 01:06:18,000 because light is so dim and Voyager was travelling so fast, 519 01:06:18,000 --> 01:06:19,840 are quite blurry sometimes. 520 01:06:19,840 --> 01:06:23,080 This is a photograph of Umbriel. You don't see much detail. 521 01:06:23,080 --> 01:06:25,120 And Miranda... 522 01:06:25,120 --> 01:06:27,160 ..which is one of my favourite moons, 523 01:06:27,160 --> 01:06:30,880 because it really does look like some kind of drunken deity 524 01:06:30,880 --> 01:06:32,840 assembled it on their day off. 525 01:06:32,840 --> 01:06:37,800 It's a complete mess. Bits of rigid sort of... Bits of rock stuck on. 526 01:06:37,800 --> 01:06:38,880 Big canyons. 527 01:06:38,880 --> 01:06:41,360 And the reason, of course, is it must have been split apart 528 01:06:41,360 --> 01:06:45,480 by a collision many billions of years ago, and then reformed. 529 01:06:45,480 --> 01:06:49,200 So, the Uranus system is a strange system. 530 01:06:49,200 --> 01:06:51,920 It's a long way away from the Earth. 531 01:06:51,920 --> 01:06:55,000 Voyager only spent five and a half hours in the system 532 01:06:55,000 --> 01:06:57,040 as it travelled through, taking these, 533 01:06:57,040 --> 01:07:01,280 the only photographs we have from near the planet, 534 01:07:01,280 --> 01:07:02,520 and then left, 535 01:07:02,520 --> 01:07:07,280 leaving the strange tilted magician behind in the twilight. 536 01:07:12,920 --> 01:07:17,480 MUSIC: Uranus, the Magician by Gustav Holst 537 01:12:44,440 --> 01:12:46,240 CROWD APPLAUDS 538 01:12:46,240 --> 01:12:48,560 Neptune does sound like the soundtrack 539 01:12:48,560 --> 01:12:51,080 to a 1960s science fiction movie in a way, doesn't it? 540 01:12:51,080 --> 01:12:53,120 Sounds very Star Trek-y, actually, at the end. 541 01:12:53,120 --> 01:12:56,880 Yeah, I think he's such a mini John Williams 542 01:12:56,880 --> 01:13:00,200 because you hear the celeste, you hear the harps, 543 01:13:00,200 --> 01:13:03,840 you hear the harmony that's not quite conventional, 544 01:13:03,840 --> 01:13:06,080 you hear the low brooding sounds. 545 01:13:06,080 --> 01:13:08,320 And he does create this world 546 01:13:08,320 --> 01:13:12,000 that we have associated with blockbuster movies. 547 01:13:12,000 --> 01:13:13,640 I mean, if you were to look in the score, 548 01:13:13,640 --> 01:13:15,440 just at the end, at the ladies' chorus... 549 01:13:17,280 --> 01:13:20,120 ..this is a facsimile of the original score. 550 01:13:20,120 --> 01:13:23,560 This bar is to be repeated until the sound is lost in the distance. 551 01:13:30,920 --> 01:13:32,800 FEMALE CHORAL SINGING 552 01:13:32,800 --> 01:13:35,600 You have this wonderful ethereal quality to the voices 553 01:13:35,600 --> 01:13:39,560 where you can't quite hear what exactly is going on 554 01:13:39,560 --> 01:13:40,880 or what they're saying, 555 01:13:40,880 --> 01:13:45,600 but it creates this space for you as a listener where you think, 556 01:13:45,600 --> 01:13:47,320 "Actually, what is out there?" 557 01:13:48,560 --> 01:13:51,160 And then you end up with this thing which is... 558 01:13:51,160 --> 01:13:53,000 ..you know, the fading away. 559 01:13:54,040 --> 01:13:58,920 "Lost in the distance", he writes. Which is... 560 01:13:58,920 --> 01:14:01,840 And they're sort of harmonically resolving. 561 01:14:01,840 --> 01:14:05,000 There's tension, there's release, there's tension, there's release. 562 01:14:05,000 --> 01:14:07,400 So it's almost like the heartbeat of the music 563 01:14:07,400 --> 01:14:09,680 is just still slowly carrying on 564 01:14:09,680 --> 01:14:13,120 as it sort of disappears into the universe. Yeah. 565 01:14:13,120 --> 01:14:18,120 CROWD APPLAUDS 566 01:14:18,120 --> 01:14:22,080 In summer 1989, Voyager 2 arrived at Neptune, 567 01:14:22,080 --> 01:14:25,320 the true frozen outpost of the solar system, 568 01:14:25,320 --> 01:14:28,120 a planet that's known as an ice giant. 569 01:14:28,120 --> 01:14:32,840 It dwarves the Earth, but made, just like Jupiter, Saturn and Uranus, 570 01:14:32,840 --> 01:14:35,960 primarily out of gas. 571 01:14:35,960 --> 01:14:41,680 It's still very cold, minus 220 degrees or so at the cloudtops. 572 01:14:41,680 --> 01:14:46,280 But Neptune produces some heat internally, 573 01:14:46,280 --> 01:14:49,720 and so at some point as you dive below the clouds 574 01:14:49,720 --> 01:14:52,320 and the pressure's increased, there is, we expect, 575 01:14:52,320 --> 01:14:55,360 a zone where you could find, perhaps, liquid water. 576 01:14:56,600 --> 01:15:00,080 Neptune is a world of violent winds. 577 01:15:00,080 --> 01:15:04,120 We saw high altitude clouds as Voyager passed by, 578 01:15:04,120 --> 01:15:06,640 clouds of methane crystals, 579 01:15:06,640 --> 01:15:13,520 supersonic winds that blow at speeds of up to 1,200mph. 580 01:15:13,520 --> 01:15:18,920 It has moons and the largest moon is a moon called Triton. 581 01:15:18,920 --> 01:15:21,000 And this is so far away from the sun, 582 01:15:21,000 --> 01:15:23,600 very little energy falls on its surface. 583 01:15:23,600 --> 01:15:27,680 But we saw activity. We saw geysers erupting into the air. 584 01:15:27,680 --> 01:15:30,920 Geysers of nitrogen, sprinkling dark material 585 01:15:30,920 --> 01:15:33,360 down wind on to its surface, 586 01:15:33,360 --> 01:15:36,440 processes that we don't yet fully understand, 587 01:15:36,440 --> 01:15:39,840 leaving streaks across the surface of the moon. 588 01:15:39,840 --> 01:15:42,920 But as Voyager left the Neptunian system, 589 01:15:42,920 --> 01:15:46,560 it took one of the most iconic images 590 01:15:46,560 --> 01:15:48,280 in the history of space exploration. 591 01:15:48,280 --> 01:15:51,360 I think, actually, it's my personal favourite, 592 01:15:51,360 --> 01:15:55,160 and I think it enhances Holst's music more than words. 593 01:15:55,160 --> 01:15:58,000 Crescent Neptune, and a moon Triton. 594 01:15:58,000 --> 01:16:01,800 A world of ice 230 degrees below zero, 595 01:16:01,800 --> 01:16:05,240 orbiting a blue planet of storms. 596 01:16:05,240 --> 01:16:07,680 These two worlds remained unseen 597 01:16:07,680 --> 01:16:11,400 for four and a half billion years after their formation, 598 01:16:11,400 --> 01:16:14,040 until our tiny emissary from Earth 599 01:16:14,040 --> 01:16:17,840 passed by on its way to interstellar space. 600 01:16:17,840 --> 01:16:20,280 Now, I suggested at the beginning of tonight's performance 601 01:16:20,280 --> 01:16:23,400 that I hoped new ideas would emerge from the synthesis 602 01:16:23,400 --> 01:16:27,200 between Holst's music and the images and scientific discoveries 603 01:16:27,200 --> 01:16:30,440 we've made since the first performance of The Planets, 604 01:16:30,440 --> 01:16:36,120 precisely 100 years ago today, on 29th September, 1918. 605 01:16:36,120 --> 01:16:39,160 And, for me, they have. 606 01:16:39,160 --> 01:16:42,240 There are billions of planets beyond our solar system, 607 01:16:42,240 --> 01:16:47,120 orbiting around the 200 billion stars in the Milky Way galaxy, 608 01:16:47,120 --> 01:16:51,760 and in the billions of galaxies beyond. 609 01:16:51,760 --> 01:16:55,040 But we discovered that solar systems and their planets 610 01:16:55,040 --> 01:17:00,360 are not necessarily, or even perhaps, usually stable... 611 01:17:00,360 --> 01:17:03,760 ..on the time scales necessary to allow complex life 612 01:17:03,760 --> 01:17:06,200 and civilisations to evolve. 613 01:17:06,200 --> 01:17:12,080 So we, the human race, might be extremely fortunate to exist 614 01:17:12,080 --> 01:17:15,760 and, therefore, we may be indescribably rare, 615 01:17:15,760 --> 01:17:18,000 and therefore precious. 616 01:17:18,000 --> 01:17:22,440 I mean, imagine that there are no other civilisations in our galaxy. 617 01:17:22,440 --> 01:17:26,080 There would then be no music amongst the stars. 618 01:17:27,120 --> 01:17:30,560 Holst tells us through his music that it's up to us 619 01:17:30,560 --> 01:17:32,200 how we navigate our problems, 620 01:17:32,200 --> 01:17:37,480 to choose HOW, or even IF we want to undertake the journey 621 01:17:37,480 --> 01:17:41,760 from Mars to Neptune, from war to enlightenment. 622 01:17:41,760 --> 01:17:45,360 His message is amplified, I think, a hundredfold, 623 01:17:45,360 --> 01:17:48,240 by an understanding of our place in the universe, 624 01:17:48,240 --> 01:17:52,120 an understanding of the fragility and value of humanity, 625 01:17:52,120 --> 01:17:55,640 living as we do together on a small world, 626 01:17:55,640 --> 01:18:01,640 accompanied by our seven planetary companions adrift in the dark. 627 01:18:06,720 --> 01:18:12,080 MUSIC: Neptune, the Mystic by Gustav Holst 628 01:26:02,640 --> 01:26:10,360 CROWD APPLAUD 54302

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