1 00:00:14,120 --> 00:00:15,120 Nightfall… 2 00:00:19,240 --> 00:00:22,880 reveals our planet's connection to the universe. 3 00:00:28,160 --> 00:00:29,560 A shooting star. 4 00:00:31,200 --> 00:00:34,480 Ancient rock from the depths of space… 5 00:00:38,680 --> 00:00:39,880 falling to Earth. 6 00:00:50,320 --> 00:00:54,880 Inside it are the chemical elements that built our universe. 7 00:01:10,480 --> 00:01:12,160 For countless generations, 8 00:01:13,000 --> 00:01:16,160 sea turtles have roamed the oceans, 9 00:01:16,760 --> 00:01:20,480 gathering cosmic elements in the food they eat. 10 00:01:24,160 --> 00:01:27,720 And as they've done for hundreds of millions of years… 11 00:01:33,880 --> 00:01:35,560 every new generation 12 00:01:37,520 --> 00:01:40,360 recycles this same stardust… 13 00:01:43,320 --> 00:01:45,200 to produce the next. 14 00:01:53,800 --> 00:01:55,400 Born in The Big Bang… 15 00:01:56,840 --> 00:01:59,400 …and forged in the hearts of stars… 16 00:02:01,640 --> 00:02:05,600 …90 chemical elements have created everything. 17 00:02:08,120 --> 00:02:10,680 Endlessly recycled and reconfigured 18 00:02:11,680 --> 00:02:15,160 throughout the entire history of the universe. 19 00:02:18,240 --> 00:02:19,480 And now… 20 00:02:21,640 --> 00:02:23,440 using the same elements, 21 00:02:24,760 --> 00:02:27,400 each new turtle begins a life cycle… 22 00:02:33,960 --> 00:02:37,600 …that mirrors the lives of the stars. 23 00:03:18,400 --> 00:03:20,960 On Australia's Great Barrier Reef… 24 00:03:28,680 --> 00:03:31,120 …something magical has happened. 25 00:03:37,880 --> 00:03:40,280 After 50 days beneath the sand, 26 00:03:41,480 --> 00:03:46,880 chemical elements from across the cosmos have created life. 27 00:03:49,280 --> 00:03:52,480 Combining to form the next generation 28 00:03:53,480 --> 00:03:54,960 of green sea turtles. 29 00:04:18,400 --> 00:04:22,400 The eggs have now exhausted their supply of life-giving elements. 30 00:04:39,760 --> 00:04:45,160 And today, the baby turtles will take their first taste of air. 31 00:04:59,080 --> 00:05:03,000 And as her brothers and sisters scramble to make it to the water… 32 00:05:08,600 --> 00:05:09,800 a little female… 33 00:05:12,560 --> 00:05:14,400 is last to be born. 34 00:05:20,120 --> 00:05:22,160 In order to grow to adulthood, 35 00:05:23,880 --> 00:05:27,720 she will need to harvest chemical elements from across the ocean. 36 00:05:36,800 --> 00:05:38,400 It's a dangerous journey… 37 00:05:41,120 --> 00:05:43,280 …with treachery at every turn. 38 00:05:50,400 --> 00:05:51,880 But for the baby turtles, 39 00:05:53,200 --> 00:05:56,360 the call of the ocean is irresistible. 40 00:06:09,840 --> 00:06:11,200 From a nest of 100, 41 00:06:12,320 --> 00:06:14,880 sometimes only one will survive. 42 00:06:18,680 --> 00:06:20,840 Sometimes none. 43 00:07:13,560 --> 00:07:15,080 But despite the risk, 44 00:07:17,240 --> 00:07:19,040 the little female knows 45 00:07:19,560 --> 00:07:21,880 she must make it to the water. 46 00:07:59,880 --> 00:08:01,320 She spots an opening… 47 00:08:04,680 --> 00:08:05,920 and takes her chance. 48 00:08:20,880 --> 00:08:21,720 Today… 49 00:08:24,400 --> 00:08:25,720 she's a lucky one. 50 00:08:29,080 --> 00:08:34,400 The hatchling won't stop swimming until she has left the reef far behind. 51 00:08:47,120 --> 00:08:51,520 Safely past the predators that gather in the shallow coastal waters, 52 00:08:52,720 --> 00:08:55,920 she'll disappear into the great void of the open ocean… 53 00:09:03,200 --> 00:09:07,600 to spend her childhood feeding on atoms. 54 00:09:14,240 --> 00:09:20,920 Atoms whose origins go back through the entire life of the cosmos. 55 00:09:26,640 --> 00:09:30,040 To the time our universe 56 00:09:30,640 --> 00:09:32,440 was in its infancy. 57 00:09:48,000 --> 00:09:53,080 Expanding from nothing to everything in an instant. 58 00:09:56,280 --> 00:09:59,800 Our universe was born in The Big Bang. 59 00:10:07,400 --> 00:10:08,280 At first, 60 00:10:09,040 --> 00:10:11,800 it was nothing but a hot, dense fog. 61 00:10:19,080 --> 00:10:21,480 But as it continued to expand… 62 00:10:24,360 --> 00:10:26,000 the fog began to cool. 63 00:10:29,400 --> 00:10:32,040 And on the tiniest scale imaginable… 64 00:10:33,600 --> 00:10:35,960 …something astounding began to occur. 65 00:10:42,000 --> 00:10:45,400 The first atoms condensed out of the fog. 66 00:10:50,120 --> 00:10:52,400 Atoms of hydrogen. 67 00:10:56,040 --> 00:10:59,600 The very first element in the universe. 68 00:11:06,640 --> 00:11:07,800 And in the ocean, 69 00:11:08,680 --> 00:11:11,920 juvenile turtles are hunting it down. 70 00:11:15,160 --> 00:11:17,480 As they emerge from the blue 71 00:11:17,560 --> 00:11:20,120 to forage in the shallow waters of the reef. 72 00:11:24,920 --> 00:11:26,560 This is Stella. 73 00:11:27,760 --> 00:11:30,640 One of the lucky ones that made it off the beach 74 00:11:31,280 --> 00:11:32,520 and into the ocean. 75 00:11:41,480 --> 00:11:44,680 She's already more than 2,000 times her hatching weight 76 00:11:45,840 --> 00:11:46,880 and growing fast. 77 00:11:51,840 --> 00:11:55,360 Feeding on creatures she's found drifting in the open ocean, 78 00:11:56,840 --> 00:11:59,880 she's harvested one element more than any other. 79 00:12:08,640 --> 00:12:09,480 Hydrogen. 80 00:12:12,560 --> 00:12:16,800 It makes up more than half of all the atoms in the food she eats. 81 00:12:20,800 --> 00:12:24,480 And is the most abundant element in all living things. 82 00:12:28,600 --> 00:12:29,680 From fish 83 00:12:30,960 --> 00:12:32,200 to invertebrates. 84 00:12:38,960 --> 00:12:41,320 Anemones and coral. 85 00:12:54,440 --> 00:12:58,560 Hydrogen atoms formed at the dawn of the universe 86 00:12:59,520 --> 00:13:03,200 have been passed on from star to planet, 87 00:13:04,320 --> 00:13:05,920 planet to animal… 88 00:13:08,320 --> 00:13:11,280 and from prey to predator. 89 00:13:22,080 --> 00:13:23,480 Which means, for Stella, 90 00:13:24,280 --> 00:13:27,000 the waters around the reef are full of danger. 91 00:13:30,880 --> 00:13:33,920 Tiger sharks, hungry for the same atoms, 92 00:13:34,000 --> 00:13:37,000 hunt sea turtles throughout their adult lives. 93 00:13:45,280 --> 00:13:48,560 Stella's main defense is her trusty armor. 94 00:13:52,280 --> 00:13:55,280 Its bone toughened with calcium and phosphorus. 95 00:14:02,320 --> 00:14:05,320 Elements that date back to another pivotal moment… 96 00:14:09,400 --> 00:14:11,280 in the life of our universe. 97 00:14:21,920 --> 00:14:25,680 For the first 300 million years after The Big Bang… 98 00:14:28,080 --> 00:14:31,000 there are no planets and no stars. 99 00:14:34,080 --> 00:14:36,600 The dark ages of the universe. 100 00:14:42,360 --> 00:14:44,120 Concealed in the gloom, 101 00:14:44,640 --> 00:14:48,600 vast tendrils of hydrogen gas crisscross the cosmos. 102 00:14:53,280 --> 00:14:55,560 And then, incredibly, 103 00:14:56,200 --> 00:14:58,680 as they were drawn together by gravity… 104 00:15:02,400 --> 00:15:04,520 …the first stars were born. 105 00:15:11,120 --> 00:15:13,000 This is the cosmic dawn. 106 00:15:16,720 --> 00:15:20,880 The moment the lights came on. 107 00:15:28,000 --> 00:15:30,680 And deep within those first stars… 108 00:15:34,880 --> 00:15:37,080 a remarkable process began. 109 00:15:42,800 --> 00:15:46,080 Temperatures and pressures were so extreme… 110 00:15:48,080 --> 00:15:50,360 …that new elements were created. 111 00:15:52,520 --> 00:15:56,400 Atoms of hydrogen were forced together to make helium. 112 00:15:58,800 --> 00:16:01,880 As they fused, energy was released. 113 00:16:04,520 --> 00:16:09,200 Creating a chain reaction that produced increasingly heavier elements. 114 00:16:12,320 --> 00:16:15,640 Including those essential for life. 115 00:16:17,640 --> 00:16:21,360 Three helium atoms combined to make carbon. 116 00:16:26,800 --> 00:16:29,480 The element on which all life is based. 117 00:16:31,760 --> 00:16:34,560 Carbon and helium made oxygen. 118 00:16:36,120 --> 00:16:37,400 The air we breathe. 119 00:16:39,680 --> 00:16:42,880 Oxygen atoms combined to make phosphorus. 120 00:16:44,920 --> 00:16:47,160 Then silicon and calcium. 121 00:16:50,200 --> 00:16:52,800 The elements that make up every living thing 122 00:16:54,320 --> 00:16:58,800 were created in the hearts of the very first stars. 123 00:17:31,000 --> 00:17:31,880 For Stella, 124 00:17:33,160 --> 00:17:35,040 some elements are so important… 125 00:17:38,600 --> 00:17:41,080 …she'll travel great distances to find them. 126 00:17:51,600 --> 00:17:56,000 The warm, shallow waters between Australia and Papua New Guinea 127 00:17:57,360 --> 00:17:59,800 are a paradise of vibrant seagrass. 128 00:18:04,200 --> 00:18:06,680 The prairies of the ocean. 129 00:18:16,120 --> 00:18:21,960 Stella has traveled all the way here to access their magic ingredients. 130 00:18:32,560 --> 00:18:34,000 As it grows, 131 00:18:34,080 --> 00:18:37,200 seagrass absorbs elements from outer space 132 00:18:37,920 --> 00:18:40,680 that have found their way to the ocean floor. 133 00:18:43,880 --> 00:18:48,040 Burgeoning fronds rich in calcium and phosphorus 134 00:18:49,760 --> 00:18:53,280 provide Stella with precisely the minerals she needs 135 00:18:55,080 --> 00:18:58,320 to build and sustain her protective shell. 136 00:19:01,880 --> 00:19:06,000 Hardening her armor for the trials ahead. 137 00:19:14,400 --> 00:19:16,960 Stella will spend her adolescent years 138 00:19:17,680 --> 00:19:19,200 searching the ocean 139 00:19:20,920 --> 00:19:24,240 for atoms born in the stars. 140 00:19:33,240 --> 00:19:35,080 Her journey toward maturity… 141 00:19:37,320 --> 00:19:40,800 paralleled in the story of our universe. 142 00:19:45,680 --> 00:19:48,920 Because three billion years after The Big Bang… 143 00:19:53,880 --> 00:19:56,680 …the universe was also coming of age. 144 00:20:02,640 --> 00:20:08,440 It was entering an incredibly active phase of star formation. 145 00:20:12,200 --> 00:20:13,240 As they grew, 146 00:20:13,960 --> 00:20:17,280 stars were pulled together into vast galaxies. 147 00:20:20,080 --> 00:20:21,800 Like our Milky Way. 148 00:20:25,000 --> 00:20:26,880 And within those galaxies, 149 00:20:28,160 --> 00:20:30,840 the chemical elements each star produced… 150 00:20:34,520 --> 00:20:40,960 …were transformed into planets and moons. 151 00:20:49,920 --> 00:20:51,480 After billions of years, 152 00:20:53,320 --> 00:20:58,880 chemical elements have matured into the Earth we know today. 153 00:21:23,080 --> 00:21:25,800 Stella is now fully grown herself. 154 00:21:29,880 --> 00:21:31,240 Over a meter long, 155 00:21:32,280 --> 00:21:35,600 she has a thick shell covered in green algae. 156 00:21:39,240 --> 00:21:42,400 Ideal camouflage for cruising coral reefs. 157 00:21:46,600 --> 00:21:49,120 She is now at one with the ocean. 158 00:21:55,800 --> 00:21:57,440 Atoms from the stars 159 00:21:59,320 --> 00:22:02,600 perfectly adapted to life at sea. 160 00:22:11,000 --> 00:22:13,120 Just one example of life on Earth… 161 00:22:15,280 --> 00:22:18,320 exquisitely shaped from the cosmos. 162 00:22:35,560 --> 00:22:39,000 Stella is now ready for the next stage of her life. 163 00:22:43,680 --> 00:22:47,000 Because she's about to become a mother herself. 164 00:22:50,200 --> 00:22:51,320 Inside her body… 165 00:22:53,960 --> 00:22:56,480 she's carrying a clutch of 100 eggs. 166 00:22:58,280 --> 00:23:01,080 The first of many she'll have over her lifetime. 167 00:23:03,680 --> 00:23:07,880 Her own precious cargo of stardust. 168 00:23:15,760 --> 00:23:17,120 All across the reef, 169 00:23:18,360 --> 00:23:20,720 atoms are being assembled into new life. 170 00:23:25,480 --> 00:23:30,160 Creating one of the richest ecosystems on Earth. 171 00:23:35,920 --> 00:23:38,000 But our planet… 172 00:23:41,320 --> 00:23:42,400 …is an outlier. 173 00:23:44,960 --> 00:23:47,120 In the rest of the solar system, 174 00:23:47,200 --> 00:23:49,160 the very same elements 175 00:23:49,240 --> 00:23:54,000 have created worlds far less suited to life. 176 00:23:59,920 --> 00:24:01,320 Closest to the sun, 177 00:24:02,080 --> 00:24:05,000 Mercury is a planet rich in carbon. 178 00:24:07,880 --> 00:24:09,680 But rather than creating life, 179 00:24:11,560 --> 00:24:13,800 the carbon is baked into its crust. 180 00:24:16,160 --> 00:24:19,920 On a world scorched by starlight. 181 00:24:22,520 --> 00:24:26,440 While in the farthest reaches of the solar system, 182 00:24:26,520 --> 00:24:28,560 Neptune's freezing temperatures 183 00:24:29,480 --> 00:24:33,520 cause carbon and hydrogen to form clouds of methane. 184 00:24:36,680 --> 00:24:40,880 The suffocating gas that gives it its brilliant blue. 185 00:24:46,640 --> 00:24:47,960 And even on Mars, 186 00:24:49,160 --> 00:24:51,960 a planet with all the same ingredients as Earth… 187 00:24:54,320 --> 00:24:56,880 the lack of an oxygen-rich atmosphere 188 00:24:57,520 --> 00:25:00,880 means complex life couldn't survive here. 189 00:25:07,800 --> 00:25:12,080 Only on Earth are conditions just right. 190 00:25:18,320 --> 00:25:19,320 But even here, 191 00:25:20,120 --> 00:25:22,280 competition for elements is fierce. 192 00:25:24,200 --> 00:25:25,040 And danger… 193 00:25:27,560 --> 00:25:29,040 …is never far away. 194 00:25:44,880 --> 00:25:48,400 Luckily, Stella has become an expert at hide-and-seek. 195 00:26:29,920 --> 00:26:31,400 Safe for now… 196 00:26:34,320 --> 00:26:37,320 Stella faces the biggest challenge of her life. 197 00:26:39,520 --> 00:26:42,280 To return to the Great Barrier Reef 198 00:26:43,920 --> 00:26:45,600 and the island of her birth… 199 00:26:49,480 --> 00:26:51,880 to lay her own eggs in the sand. 200 00:26:58,880 --> 00:27:01,440 But a lifetime spent wandering the ocean 201 00:27:02,200 --> 00:27:05,600 means she's now 2,000 kilometers away. 202 00:27:09,840 --> 00:27:11,520 How Stella navigates home 203 00:27:12,160 --> 00:27:14,760 is one of the wonders of the natural world. 204 00:27:21,400 --> 00:27:22,760 Deep within the Earth, 205 00:27:23,600 --> 00:27:26,600 our planet's core generates a magnetic field… 206 00:27:28,840 --> 00:27:33,880 which gives every place on its surface a unique magnetic signature. 207 00:27:37,560 --> 00:27:39,120 When she hatched, 208 00:27:39,200 --> 00:27:43,520 her island's signature was imprinted in Stella's brain. 209 00:27:46,200 --> 00:27:48,200 And to find her way back, 210 00:27:48,280 --> 00:27:51,600 she'll rely on yet another chemical element. 211 00:27:53,760 --> 00:27:56,880 One that connects her to the planet's core. 212 00:28:00,400 --> 00:28:05,080 An element that's only created when stars die. 213 00:28:10,680 --> 00:28:12,720 In a nearby part of the galaxy, 214 00:28:13,720 --> 00:28:15,680 two and a half million years ago, 215 00:28:16,720 --> 00:28:20,520 a dramatic change took place in the core of a giant star. 216 00:28:25,280 --> 00:28:29,360 For all its life, it had been powered by nuclear fusion. 217 00:28:35,880 --> 00:28:37,200 The energy released… 218 00:28:39,040 --> 00:28:41,440 …creating heavier and heavier elements. 219 00:28:45,200 --> 00:28:48,120 Until the core became so hot, 220 00:28:48,640 --> 00:28:49,880 it started creating… 221 00:28:51,640 --> 00:28:52,480 …iron. 222 00:28:55,360 --> 00:28:58,200 Which caused a fundamental change to take place. 223 00:29:03,080 --> 00:29:06,360 Because making iron doesn't release energy. 224 00:29:07,880 --> 00:29:09,160 It consumes it. 225 00:29:15,880 --> 00:29:18,360 As more and more of the metal was produced, 226 00:29:19,240 --> 00:29:22,760 it spread through the core like a disease. 227 00:29:27,160 --> 00:29:29,160 Feeding off the star's heat. 228 00:29:33,880 --> 00:29:34,880 Throttling it. 229 00:29:46,280 --> 00:29:48,560 With no heat source to hold it up. 230 00:29:52,840 --> 00:29:54,400 From this moment onward… 231 00:29:57,480 --> 00:29:59,680 …the star was doomed. 232 00:30:11,600 --> 00:30:16,200 The resulting explosion shone with the brightness of 10 billion suns. 233 00:30:22,000 --> 00:30:27,080 A supernova which propelled iron-rich dust across the galaxy. 234 00:30:35,120 --> 00:30:38,120 All the way to our planet. 235 00:30:43,160 --> 00:30:44,280 And even now, 236 00:30:45,280 --> 00:30:50,280 100 tons of stardust enters Earth's atmosphere every day. 237 00:30:53,080 --> 00:30:56,800 Some left over from the formation of the solar system. 238 00:31:00,600 --> 00:31:04,480 Some blown here from distant supernovas. 239 00:31:08,400 --> 00:31:13,600 A direct link between our planet and the stars. 240 00:31:19,680 --> 00:31:21,960 And it's the iron in this dust 241 00:31:22,520 --> 00:31:25,400 that allows Stella to find her way. 242 00:31:33,520 --> 00:31:35,200 Because deep in her brain… 243 00:31:38,280 --> 00:31:43,600 …specialized cells are thought to contain crystals of magnetite. 244 00:31:44,520 --> 00:31:48,760 An iron-rich mineral that aligns itself to the Earth's magnetic field. 245 00:31:52,760 --> 00:31:53,680 A compass, 246 00:31:55,560 --> 00:31:57,680 pointing her in the right direction. 247 00:32:05,440 --> 00:32:11,680 Allowing Stella to find the unique magnetic fingerprint of home. 248 00:32:19,480 --> 00:32:22,680 And so an element forged in a supernova… 249 00:32:30,360 --> 00:32:34,280 …will now guide her across kilometers of featureless ocean. 250 00:32:48,600 --> 00:32:49,920 Back to the island… 251 00:32:53,800 --> 00:32:55,480 on which she was born. 252 00:33:08,120 --> 00:33:12,040 But there are other creatures with magnetic homing abilities. 253 00:33:14,680 --> 00:33:16,480 The tiger sharks have it too. 254 00:33:19,600 --> 00:33:22,280 And it's leading them back to the same island. 255 00:33:26,560 --> 00:33:28,920 Because for a few months every year, 256 00:33:29,000 --> 00:33:32,600 thousands of female turtles come here to lay their eggs. 257 00:33:34,600 --> 00:33:37,880 It's the largest gathering of green sea turtles 258 00:33:37,960 --> 00:33:39,960 anywhere on the planet. 259 00:33:45,600 --> 00:33:47,320 And as they come to shore, 260 00:33:49,080 --> 00:33:50,320 the feeding begins. 261 00:34:03,800 --> 00:34:06,160 Stella must wait for the right moment… 262 00:34:08,840 --> 00:34:10,040 to find an opening… 263 00:34:12,160 --> 00:34:14,080 and avoid the onslaught. 264 00:34:32,080 --> 00:34:33,800 When the danger has passed… 265 00:34:37,440 --> 00:34:39,080 she finally swims ashore. 266 00:34:52,280 --> 00:34:53,880 After an epic journey… 267 00:34:57,080 --> 00:34:59,240 Stella emerges onto the sand 268 00:35:00,840 --> 00:35:03,320 she last touched as a hatchling. 269 00:35:28,040 --> 00:35:30,920 The elements she spent a lifetime collecting… 270 00:35:36,600 --> 00:35:39,160 are now safely delivered into the sand. 271 00:35:45,240 --> 00:35:46,960 Stella's mission is complete, 272 00:35:47,520 --> 00:35:49,240 and she returns to the ocean… 273 00:35:52,880 --> 00:35:56,600 to begin gathering stardust once more. 274 00:36:00,480 --> 00:36:01,800 The cycle of her life 275 00:36:03,640 --> 00:36:06,520 mirroring the grandest cycle of all. 276 00:36:08,440 --> 00:36:11,920 The lives and deaths of the stars. 277 00:36:22,480 --> 00:36:25,600 Because far away across the galaxy, 278 00:36:27,000 --> 00:36:29,680 the ashes of countless supernovas 279 00:36:29,760 --> 00:36:34,480 have come together to form a giant nebula. 280 00:36:41,280 --> 00:36:44,480 A cloud of stardust tens of light-years across. 281 00:36:48,120 --> 00:36:52,600 And buried within it are places where the next generation of stars 282 00:36:53,840 --> 00:36:55,280 are beginning to form. 283 00:37:06,800 --> 00:37:08,400 Called proplyds. 284 00:37:10,400 --> 00:37:12,880 They're like vast cosmic eggs. 285 00:37:15,000 --> 00:37:17,680 Each one bigger than our solar system. 286 00:37:23,720 --> 00:37:26,640 Inside their shells of ionized gas, 287 00:37:28,560 --> 00:37:31,480 the force of gravity is pulling stardust together. 288 00:37:38,880 --> 00:37:42,400 And the stardust inside Stella's eggs… 289 00:37:45,440 --> 00:37:47,560 is also beginning to take shape. 290 00:37:56,200 --> 00:38:01,800 As the elements she collected are being transformed… 291 00:38:08,280 --> 00:38:11,800 into something that's starting to resemble a tiny creature. 292 00:38:24,280 --> 00:38:25,640 And within the proplyd… 293 00:38:27,840 --> 00:38:30,240 gases like hydrogen and helium… 294 00:38:33,120 --> 00:38:35,680 …are feeding an embryonic star. 295 00:38:44,880 --> 00:38:46,680 And what was once an embryo… 296 00:38:49,080 --> 00:38:51,080 is now a tiny turtle… 297 00:38:55,200 --> 00:38:58,880 with shell, flippers, and beak. 298 00:39:02,880 --> 00:39:04,680 Elements reimagined… 299 00:39:08,080 --> 00:39:10,280 for a life at sea. 300 00:39:15,160 --> 00:39:16,120 In the proplyd, 301 00:39:17,000 --> 00:39:20,200 the new star's development is also nearing completion. 302 00:39:21,480 --> 00:39:24,800 Reborn from the ashes of the previous generation, 303 00:39:26,120 --> 00:39:30,000 its light now reveals a family of growing planets in orbit. 304 00:39:34,200 --> 00:39:35,320 New worlds. 305 00:39:36,240 --> 00:39:40,280 But perhaps, new possibilities for life. 306 00:39:48,280 --> 00:39:49,920 And beneath the sand, 307 00:39:51,240 --> 00:39:52,760 the same stardust, 308 00:39:54,080 --> 00:39:58,800 passed down through countless generations of stars and turtles… 309 00:40:00,880 --> 00:40:03,200 will start yet another journey. 310 00:40:08,160 --> 00:40:09,560 Each new life 311 00:40:11,080 --> 00:40:15,400 directly connected to the origin of the universe. 312 00:40:20,840 --> 00:40:26,400 Each new story beginning at the end of the last. 313 00:40:34,880 --> 00:40:38,880 And so, the story of our universe continues… 314 00:40:40,760 --> 00:40:43,000 …with Earth's most precious resource… 315 00:40:46,280 --> 00:40:47,120 …water. 316 00:40:48,920 --> 00:40:52,800 And a family of elephants on a dangerous mission to find it. 317 00:40:57,000 --> 00:40:59,360 Their journey every bit as extraordinary… 318 00:41:01,680 --> 00:41:06,440 …as water's journey across the vastness of space to our planet. 319 00:41:10,640 --> 00:41:13,840 But why is Earth the only world in the solar system 320 00:41:14,840 --> 00:41:17,240 whose surface is covered with liquid water? 321 00:41:18,600 --> 00:41:21,960 And why is it so essential for life?