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These are the user uploaded subtitles that are being translated: 1 00:00:01,386 --> 00:00:03,688 Can something in space 2 00:00:03,789 --> 00:00:06,591 cause animals to be born with two heads? 3 00:00:08,227 --> 00:00:10,495 Why were the most fearsome warriors 4 00:00:10,596 --> 00:00:12,330 our planet has ever known 5 00:00:12,431 --> 00:00:17,068 stopped by a flaming light in the sky? 6 00:00:17,136 --> 00:00:21,072 How did Columbus use secret knowledge of the heavens 7 00:00:21,140 --> 00:00:25,343 to cheat death in the New World. 8 00:00:25,410 --> 00:00:29,847 Our ancestors saw a universe filled with bad omens. 9 00:00:29,948 --> 00:00:32,316 But what were they really seeing? 10 00:00:32,417 --> 00:00:35,319 And how did fear of these objects in the sky 11 00:00:35,420 --> 00:00:38,456 change history? 12 00:00:41,326 --> 00:00:43,261 Ancient mysteries, 13 00:00:43,328 --> 00:00:47,098 shrouded in the shadows of time... 14 00:00:47,199 --> 00:00:49,834 Now, can they finally be solved 15 00:00:49,935 --> 00:00:53,504 by looking to the heavens? 16 00:00:53,572 --> 00:00:56,207 The truth is up there, 17 00:00:56,308 --> 00:00:59,377 hidden among the stars 18 00:00:59,444 --> 00:01:01,679 in a place we call... 19 00:01:10,856 --> 00:01:13,357 For our ancestors, 20 00:01:13,458 --> 00:01:17,228 the skies were filled with equal parts wonder... 21 00:01:19,565 --> 00:01:21,732 And terror. 22 00:01:23,936 --> 00:01:27,772 Bad omens from above changed human history... 23 00:01:27,839 --> 00:01:30,408 again and again. 24 00:01:35,948 --> 00:01:39,617 Four centuries before the birth of Jesus, 25 00:01:39,718 --> 00:01:42,453 it is a time of war... 26 00:01:42,554 --> 00:01:45,590 Athens versus Sparta. 27 00:01:45,657 --> 00:01:49,460 And this time it's for keeps. 28 00:01:49,561 --> 00:01:54,332 Control of the ancient world hangs in the balance. 29 00:01:54,433 --> 00:01:57,435 Thousands of brave warriors, 30 00:01:57,536 --> 00:02:00,304 hundreds of ships at sea... 31 00:02:00,372 --> 00:02:03,341 all poised for action, 32 00:02:03,442 --> 00:02:06,244 waiting for the command from their leaders 33 00:02:06,345 --> 00:02:09,480 to unleash hell on Earth. 34 00:02:12,117 --> 00:02:13,884 And then... 35 00:02:16,188 --> 00:02:19,357 An omen... 36 00:02:19,458 --> 00:02:23,628 a strange light in the sky... 37 00:02:23,729 --> 00:02:26,297 a fiery object said to be visible 38 00:02:26,365 --> 00:02:29,133 for 75 days... 39 00:02:29,201 --> 00:02:33,704 as both sides nervously watch and wait. 40 00:02:36,742 --> 00:02:38,542 It's an omen. 41 00:02:38,644 --> 00:02:42,913 But what does it mean, and what is the object? 42 00:02:47,185 --> 00:02:50,554 The Spartans devise a strategy. 43 00:02:50,656 --> 00:02:52,823 They send an envoy to the Greeks, 44 00:02:52,924 --> 00:02:56,327 saying that with such a bad omen overhead, 45 00:02:56,428 --> 00:02:58,729 battle would have to wait. 46 00:03:01,466 --> 00:03:03,801 As days stretch into weeks, 47 00:03:03,902 --> 00:03:08,372 the Greeks grow confident no attack is coming. 48 00:03:11,810 --> 00:03:15,479 So that is when the Spartans strike... 49 00:03:15,547 --> 00:03:19,417 A sneak attack... 50 00:03:19,518 --> 00:03:21,552 decimating the Greeks 51 00:03:21,620 --> 00:03:24,288 and marking the beginning of the end 52 00:03:24,356 --> 00:03:29,360 for the nearly 30-year-long Peloponnesian War. 53 00:03:32,497 --> 00:03:35,566 The final toll is staggering... 54 00:03:35,634 --> 00:03:40,237 More than 3,000 Greek men captured and killed on the spot. 55 00:03:43,408 --> 00:03:46,243 It couldn't be any clearer. 56 00:03:46,345 --> 00:03:49,447 To the Greeks, the defeat was definitive proof 57 00:03:49,548 --> 00:03:53,884 the Greek Gods had sent the sky object as a bad omen. 58 00:03:55,721 --> 00:03:57,221 If you're in the middle of a war 59 00:03:57,322 --> 00:03:59,123 and you see an omen in the skies, 60 00:03:59,224 --> 00:04:01,392 that's gonna mean something bad. 61 00:04:01,493 --> 00:04:04,695 It's something to be concerned about. 62 00:04:04,796 --> 00:04:07,498 But what was the object in the sky 63 00:04:07,599 --> 00:04:11,702 that brought an end to nearly 30 years of war? 64 00:04:14,873 --> 00:04:17,441 One account of the object describes, 65 00:04:17,509 --> 00:04:20,277 "A fiery body of vast size, 66 00:04:20,345 --> 00:04:22,613 "as if it had been a flaming cloud, 67 00:04:22,714 --> 00:04:26,283 "not resting in one place, but moving along 68 00:04:26,351 --> 00:04:30,621 with intricate and irregular motions." 69 00:04:30,689 --> 00:04:35,226 Could the ancient Greeks have been describing a meteor? 70 00:04:38,430 --> 00:04:40,464 Also known as shooting stars, 71 00:04:40,565 --> 00:04:45,136 meteors make a fiery display as they streak across the sky. 72 00:04:46,838 --> 00:04:49,740 But since they're actually small rocks and bits of dust 73 00:04:49,841 --> 00:04:52,810 burning up as they fall through the atmosphere, 74 00:04:52,878 --> 00:04:56,313 meteors don't last very long. 75 00:04:56,415 --> 00:04:58,716 They're visible for a matter of seconds, 76 00:04:58,784 --> 00:05:03,421 not days or months, as the Greeks described. 77 00:05:03,522 --> 00:05:07,625 Asteroids take longer to pass through the sky, 78 00:05:07,692 --> 00:05:09,427 but because they're dark, 79 00:05:09,494 --> 00:05:13,497 almost none of them are visible to the naked eye. 80 00:05:15,333 --> 00:05:18,102 What the ancient Greeks could have seen, however, 81 00:05:18,203 --> 00:05:20,371 was a comet. 82 00:05:22,140 --> 00:05:26,043 Mythmakers fear comets, because they linger in the sky 83 00:05:26,111 --> 00:05:29,680 for weeks, even months at a time. 84 00:05:29,781 --> 00:05:34,285 The idea of seeing a comet for 75 days, I could buy that. 85 00:05:34,386 --> 00:05:38,088 On average, only one bright comet is visible 86 00:05:38,190 --> 00:05:40,558 to the naked eye each decade, 87 00:05:40,659 --> 00:05:43,661 meaning the appearance of one in the sky 88 00:05:43,762 --> 00:05:45,796 would've been a rare and remarkable event 89 00:05:45,864 --> 00:05:49,266 to the ancients. 90 00:05:49,367 --> 00:05:50,501 Comets are made of materials 91 00:05:50,602 --> 00:05:52,403 that we find readily here on Earth. 92 00:05:52,504 --> 00:05:55,139 They're largely made up of dry ice, 93 00:05:55,207 --> 00:05:57,842 frozen carbon dioxide like we exhale, 94 00:05:57,943 --> 00:06:01,745 as well as water, a little bit of organic material, 95 00:06:01,847 --> 00:06:04,782 ammonia, not too different than what's in cleaning materials, 96 00:06:04,850 --> 00:06:09,019 and even silicates like in sand from the beach. 97 00:06:09,120 --> 00:06:11,422 When you mix all of these ingredients together, 98 00:06:11,490 --> 00:06:13,591 you have the recipe for a comet. 99 00:06:16,661 --> 00:06:18,095 When the ancient Greeks 100 00:06:18,196 --> 00:06:21,432 described a flaming cloud in the sky, 101 00:06:21,533 --> 00:06:24,268 is this what they were seeing... 102 00:06:24,369 --> 00:06:27,338 A comet, changing its position in the sky 103 00:06:27,439 --> 00:06:28,772 almost nightly, 104 00:06:28,840 --> 00:06:32,209 faster than anything they had ever seen? 105 00:06:34,379 --> 00:06:37,448 And what gives these icy objects the fiery appearance 106 00:06:37,549 --> 00:06:40,985 that spooked the ancients? 107 00:06:41,086 --> 00:06:42,520 As comets streak 108 00:06:42,621 --> 00:06:44,321 into the inner part of the solar system, 109 00:06:44,422 --> 00:06:46,824 they slowly heat up from the Sun's heat. 110 00:06:46,925 --> 00:06:49,360 As they heat up, they grow an amazing tail 111 00:06:49,461 --> 00:06:50,928 that doesn't streak out behind them, 112 00:06:51,029 --> 00:06:52,630 the way a lot of people think, 113 00:06:52,731 --> 00:06:55,599 but rather it's pushed by the Sun's radiation. 114 00:06:55,700 --> 00:06:57,001 How we're able to see that tail 115 00:06:57,102 --> 00:06:59,003 depends on where we are relative to the Sun 116 00:06:59,104 --> 00:07:00,538 and the comet. 117 00:07:00,639 --> 00:07:02,606 And sometimes that tail's pushed out 118 00:07:02,707 --> 00:07:05,442 such that as the comet flies away from the Sun, 119 00:07:05,544 --> 00:07:07,378 it flies into its own tail. 120 00:07:11,096 --> 00:07:12,863 Comets may hold the answer 121 00:07:12,964 --> 00:07:15,199 to one of the most fundamental questions 122 00:07:15,300 --> 00:07:16,901 about our planet. 123 00:07:21,473 --> 00:07:23,974 On Earth, where there is water, 124 00:07:24,076 --> 00:07:25,910 there is life. 125 00:07:27,245 --> 00:07:30,514 But just where did that water come from? 126 00:07:33,518 --> 00:07:36,420 Many have proposed the water in Earth's oceans 127 00:07:36,521 --> 00:07:38,823 was delivered by comets 128 00:07:38,924 --> 00:07:41,258 crashing into the planet. 129 00:07:43,395 --> 00:07:46,063 Others believe the water hitched a ride 130 00:07:46,164 --> 00:07:49,467 inside rocky asteroids. 131 00:07:49,568 --> 00:07:52,103 Which theory is correct? 132 00:07:55,273 --> 00:07:57,308 Enter Rosetta... 133 00:07:57,409 --> 00:08:01,178 A mission designed to survey then land a space probe 134 00:08:01,279 --> 00:08:03,781 on a comet. 135 00:08:03,882 --> 00:08:06,851 Rosetta and its lander, called Philae, 136 00:08:06,952 --> 00:08:10,187 tracked down a comet known as 67P 137 00:08:10,288 --> 00:08:15,059 after a ten-year journey through space. 138 00:08:15,160 --> 00:08:18,162 So how do you get to a comet? 139 00:08:18,263 --> 00:08:21,332 Loop around our solar system multiple times, 140 00:08:21,433 --> 00:08:23,968 including a daring low-altitude skim 141 00:08:24,069 --> 00:08:28,139 less than 200 miles above the surface of Mars. 142 00:08:28,240 --> 00:08:31,242 Then jam on the brakes. 143 00:08:33,245 --> 00:08:36,480 After establishing a stable orbit of the comet, 144 00:08:36,581 --> 00:08:39,984 the Philae lander was deployed, 145 00:08:40,085 --> 00:08:44,088 and the world watched and waited. 146 00:08:56,067 --> 00:08:59,336 The gravity on a comet is so little 147 00:08:59,437 --> 00:09:02,339 that the pull on that spacecraft was no different 148 00:09:02,440 --> 00:09:06,443 than the weight of a piece of paper on your hand. 149 00:09:08,013 --> 00:09:10,447 The lander had to be equipped with harpoons 150 00:09:10,549 --> 00:09:15,186 that would help attach it to the surface of the comet. 151 00:09:15,287 --> 00:09:17,354 When those didn't deploy, 152 00:09:17,455 --> 00:09:20,024 the lander actually bounced, 153 00:09:20,125 --> 00:09:23,961 making it not just a day for the first comet landing, 154 00:09:24,062 --> 00:09:25,563 but also the second. 155 00:09:27,999 --> 00:09:32,536 Unfortunately, when Philae finally came to est, 156 00:09:32,637 --> 00:09:36,307 it was partially in the shade of a cliff. 157 00:09:36,408 --> 00:09:39,109 That meant that the solar panels were only receiving 158 00:09:39,211 --> 00:09:40,945 about an hour and a half of sunlight, 159 00:09:41,046 --> 00:09:43,214 instead of the six hours that we were anticipating 160 00:09:43,315 --> 00:09:44,848 that they would. 161 00:09:44,950 --> 00:09:47,451 However, the Rosetta team deployed all 162 00:09:47,552 --> 00:09:49,386 of its instruments at once, 163 00:09:49,487 --> 00:09:52,056 trying to get as much data as they possibly could 164 00:09:52,157 --> 00:09:55,893 before the lander ran out of batteries. 165 00:09:55,994 --> 00:09:57,494 Despite the bad luck, 166 00:09:57,596 --> 00:10:02,099 the Rosetta mission was able to make a significant discovery. 167 00:10:02,200 --> 00:10:05,569 It appears unlikely a comet like this one 168 00:10:05,670 --> 00:10:08,305 brought water to our planet. 169 00:10:08,406 --> 00:10:10,407 Its vapor has a different chemical mix 170 00:10:10,508 --> 00:10:12,509 than we see on Earth. 171 00:10:14,546 --> 00:10:17,181 That leaves asteroids as the most likely source 172 00:10:17,282 --> 00:10:19,483 of our water... 173 00:10:19,584 --> 00:10:21,952 an important finding that could tilt 174 00:10:22,053 --> 00:10:24,121 decades of debate. 175 00:10:27,626 --> 00:10:30,394 Even if comets didn't bring water here, 176 00:10:30,495 --> 00:10:33,230 they do carry with them a set of beliefs, 177 00:10:33,331 --> 00:10:35,299 superstitions, and omens 178 00:10:35,400 --> 00:10:39,303 unlike anything else in the night sky. 179 00:10:41,273 --> 00:10:43,207 Were the ancients right 180 00:10:43,308 --> 00:10:45,542 that there's one comet in the solar system 181 00:10:45,644 --> 00:10:48,312 with the power to cause the birth of two-headed animals? 182 00:10:50,081 --> 00:10:53,984 And could that same comet end all life on Earth? 183 00:10:55,887 --> 00:10:57,588 Dy, France, 184 00:10:57,689 --> 00:11:00,991 the year 1066... 185 00:11:01,059 --> 00:11:03,927 a grand army prepares for an invasion 186 00:11:04,029 --> 00:11:08,032 that could change the course of history. 187 00:11:08,133 --> 00:11:11,035 They are Norman French soldiers, 188 00:11:11,136 --> 00:11:14,204 descendents of Vikings and warriors, 189 00:11:14,306 --> 00:11:16,040 and they are led by a man 190 00:11:16,141 --> 00:11:20,678 who will become known as William the Conqueror. 191 00:11:24,215 --> 00:11:26,984 William's army is on the move, 192 00:11:27,052 --> 00:11:31,221 inspired by an omen in the night sky. 193 00:11:31,323 --> 00:11:34,058 And what a sight it is. 194 00:11:34,159 --> 00:11:37,795 Where once there was only the normal stars and planets, 195 00:11:37,862 --> 00:11:41,565 now on view is an object four time larger in the sky 196 00:11:41,666 --> 00:11:42,900 than Venus 197 00:11:42,967 --> 00:11:46,303 and a quarter of the brightness of a full moon. 198 00:11:48,139 --> 00:11:50,574 The Normans take the comet's appearance 199 00:11:50,675 --> 00:11:52,743 and the disruption in the heavens 200 00:11:52,844 --> 00:11:56,046 as an omen that God is angry at their enemy... 201 00:11:56,147 --> 00:11:59,183 The English king Harold. 202 00:11:59,284 --> 00:12:02,052 Comets have been associated with the death of kings, 203 00:12:02,153 --> 00:12:04,755 because comets linger in the heavens. 204 00:12:04,856 --> 00:12:06,990 Meteors, they just come and go, 205 00:12:07,058 --> 00:12:09,193 but comets linger in the heavens, 206 00:12:09,294 --> 00:12:13,063 signaling that the gods are angry at the king 207 00:12:13,131 --> 00:12:15,766 and the king must die. 208 00:12:18,670 --> 00:12:22,172 October 14, 1066... 209 00:12:22,273 --> 00:12:25,042 The Normans have crossed the English Channel 210 00:12:25,143 --> 00:12:27,945 and engaged King Harold and his forces 211 00:12:28,046 --> 00:12:30,647 at the Battle of Hastings. 212 00:12:30,749 --> 00:12:35,018 It's time to fight and, for thousands of men, 213 00:12:35,120 --> 00:12:37,287 time to die. 214 00:12:42,026 --> 00:12:43,861 When the battle finally ends, 215 00:12:43,962 --> 00:12:48,632 6,000 men are dead, more English than Norman. 216 00:12:48,733 --> 00:12:50,868 That includes King Harold, 217 00:12:50,935 --> 00:12:55,706 whose advisors had warned him the object was a bad omen. 218 00:12:55,774 --> 00:12:57,741 And it works. The Normans won. 219 00:12:57,842 --> 00:12:59,109 The Anglo-Saxons lost. 220 00:12:59,210 --> 00:13:01,078 The history of the English-speaking world 221 00:13:01,179 --> 00:13:02,913 changed forever. 222 00:13:03,014 --> 00:13:05,516 The battle and the omen 223 00:13:05,583 --> 00:13:09,086 live on in a famous work of art. 224 00:13:09,187 --> 00:13:11,688 The Bayeux Tapestry is an incredible work of art. 225 00:13:11,756 --> 00:13:13,223 It's 230 feet long, 226 00:13:13,291 --> 00:13:16,026 and it tells the whole story of the invasion. 227 00:13:16,127 --> 00:13:18,529 It shows them crossing the English Channel. 228 00:13:18,630 --> 00:13:19,863 It shows them in battle. 229 00:13:19,931 --> 00:13:21,698 It shows the Anglo-Saxon shield wall. 230 00:13:21,800 --> 00:13:24,067 It even shows the Anglo-Saxon king dying 231 00:13:24,169 --> 00:13:26,470 with an arrow in his eye. 232 00:13:26,571 --> 00:13:29,139 And there, hovering over it all, 233 00:13:29,207 --> 00:13:31,875 is the omen that set it all in motion... 234 00:13:31,943 --> 00:13:33,877 Not just any comet, 235 00:13:33,978 --> 00:13:35,846 it's Halley's Comet. 236 00:13:37,816 --> 00:13:39,716 Halley's Comet has been recorded 237 00:13:39,818 --> 00:13:43,720 by Chinese astronomers and on ancient stone tablets, 238 00:13:43,822 --> 00:13:48,225 dating back thousands of years. 239 00:13:48,293 --> 00:13:50,227 The comet swings by the Sun 240 00:13:50,295 --> 00:13:53,897 once every 75 or 76 years, 241 00:13:53,998 --> 00:13:56,900 making it the only comet visible to the naked eye 242 00:13:57,001 --> 00:14:00,671 that you can see twice in a lifetime. 243 00:14:01,330 --> 00:14:05,667 It seems nearly every time Halley's Comet swings by Earth, 244 00:14:05,768 --> 00:14:08,336 it shakes up our history. 245 00:14:11,874 --> 00:14:14,276 The ancient Swiss thought of Halley's Comet 246 00:14:14,377 --> 00:14:16,111 as such a bad omen, 247 00:14:16,212 --> 00:14:19,314 they blamed it for everything from earthquakes 248 00:14:19,415 --> 00:14:21,283 to the birth of two-headed animals. 249 00:14:23,519 --> 00:14:26,788 Following its appearance in 1456, 250 00:14:26,856 --> 00:14:30,125 it is said the Pope excommunicated the comet, 251 00:14:30,226 --> 00:14:33,228 thinking it was a bad omen for Christian soldiers 252 00:14:33,329 --> 00:14:35,730 battling the Ottoman Empire. 253 00:14:35,832 --> 00:14:40,635 But is fear of Halley's Comet just superstition, 254 00:14:40,736 --> 00:14:45,407 or could it really cause earthly Armageddon? 255 00:14:47,410 --> 00:14:49,578 Imagine... 256 00:14:49,679 --> 00:14:53,515 November 27, 2061... 257 00:14:53,583 --> 00:14:57,786 As amateur astronomers gather for a look at Halley's Comet, 258 00:14:57,854 --> 00:14:59,788 stunning news is confirmed. 259 00:14:59,856 --> 00:15:02,824 There has been a change in Halley's orbit, 260 00:15:02,925 --> 00:15:07,462 and it's headed straight for Earth. 261 00:15:07,563 --> 00:15:10,232 If a giant comet were to crash into the Earth, 262 00:15:10,299 --> 00:15:13,068 it would really ruin your day. 263 00:15:13,136 --> 00:15:16,271 First of all, there would be a blinding flash of heat 264 00:15:16,372 --> 00:15:18,473 traveling at the speed of light, 265 00:15:18,574 --> 00:15:21,543 infrared radiation, heat radiation coming out. 266 00:15:21,644 --> 00:15:24,779 Then a few seconds later, the shockwave. 267 00:15:24,847 --> 00:15:28,283 The shockwave traveling near the speed of sound, 268 00:15:28,384 --> 00:15:31,419 pulverizing everything in its wake. 269 00:15:31,487 --> 00:15:35,323 And then after that, perhaps we would have a tsunami 270 00:15:35,391 --> 00:15:37,659 coming at you. 271 00:15:37,760 --> 00:15:41,062 Remember that Halley's Comet is about 20 miles across, 272 00:15:41,130 --> 00:15:43,165 about the size of Manhattan, 273 00:15:43,266 --> 00:15:45,800 but the object which destroyed the dinosaurs 274 00:15:45,902 --> 00:15:49,437 65 million years ago was only 6 miles across. 275 00:15:49,539 --> 00:15:52,607 And so, if we had Halley's Comet 276 00:15:52,708 --> 00:15:53,808 hit the planet Earth, 277 00:15:53,910 --> 00:15:56,311 it would be not just a city buster, 278 00:15:56,379 --> 00:15:59,214 it would be a planet buster. 279 00:16:01,350 --> 00:16:03,718 Even today we have the technology 280 00:16:03,819 --> 00:16:06,288 to track and photograph Halley's Comet 281 00:16:06,389 --> 00:16:08,223 at every point in its orbit. 282 00:16:08,291 --> 00:16:11,593 In the future, there is time to develop a plan 283 00:16:11,661 --> 00:16:14,429 to save humanity. 284 00:16:14,530 --> 00:16:17,766 If we have a comet and we've been following its orbit, 285 00:16:17,833 --> 00:16:20,235 for many, many years and we know it very accurately 286 00:16:20,336 --> 00:16:23,538 and we can predict the collision with Earth 287 00:16:23,639 --> 00:16:24,773 decades ahead of time, 288 00:16:24,840 --> 00:16:27,075 then we might be able to do something 289 00:16:27,176 --> 00:16:30,445 about that comet before it hits the Earth. 290 00:16:30,546 --> 00:16:33,615 You can send a spacecraft up there and tug it a little bit 291 00:16:33,716 --> 00:16:36,785 so that a bit at a time we pull it away 292 00:16:36,886 --> 00:16:40,789 in such a way that it doesn't hit the Earth. 293 00:16:40,890 --> 00:16:42,457 The truly dangerous comets 294 00:16:42,558 --> 00:16:45,627 are the ones we've never seen before... 295 00:16:45,728 --> 00:16:47,629 Objects with orbits so long 296 00:16:47,730 --> 00:16:49,631 that they come in once every thousand 297 00:16:49,732 --> 00:16:52,467 or ten thousand years. 298 00:16:52,568 --> 00:16:54,836 For a comet coming in for the first time 299 00:16:54,904 --> 00:16:56,438 in recorded history, 300 00:16:56,539 --> 00:16:58,840 there's essentially nothing we can do 301 00:16:58,908 --> 00:17:00,742 with today's technology. 302 00:17:00,810 --> 00:17:04,813 We have a few months' warning, maybe one year at maximum. 303 00:17:04,914 --> 00:17:06,748 We don't know the trajectory very well. 304 00:17:06,816 --> 00:17:10,018 We can't send up the spacecraft. 305 00:17:10,086 --> 00:17:13,021 So I'm sorry to say that if there's a giant comet 306 00:17:13,089 --> 00:17:14,489 with Earth's name written on it 307 00:17:14,557 --> 00:17:17,192 heading toward us for the first time, 308 00:17:17,260 --> 00:17:18,493 it's good-bye, cruel world. 309 00:17:18,594 --> 00:17:20,395 I'm sorry. 310 00:17:20,463 --> 00:17:24,366 A really bad omen that actually comes to pass. 311 00:17:27,436 --> 00:17:30,372 If a new comet is approaching Earth for the first time 312 00:17:30,439 --> 00:17:32,274 in recorded history, 313 00:17:32,375 --> 00:17:36,111 it's definitely coming in fast. 314 00:17:36,178 --> 00:17:38,647 Visualizing the motion of a comet in its orbit 315 00:17:38,714 --> 00:17:42,217 is kind of like visualizing the motion of a ball 316 00:17:42,318 --> 00:17:43,485 being tossed into the air. 317 00:17:43,586 --> 00:17:45,687 It starts out moving fairly quickly, 318 00:17:45,788 --> 00:17:47,756 slows at the apex, 319 00:17:47,857 --> 00:17:50,125 and accelerates back towards the ground. 320 00:17:50,226 --> 00:17:53,461 This is, in fact, a partial orbit. 321 00:17:53,529 --> 00:17:56,231 Let's look at one full orbit. 322 00:17:58,167 --> 00:18:00,368 So, as a comet moves away from the Sun, 323 00:18:00,436 --> 00:18:02,170 it's moving fairly quickly 324 00:18:02,271 --> 00:18:04,739 until, under the Sun's gravitational influence, 325 00:18:04,807 --> 00:18:07,309 it slows, reaching the apex, 326 00:18:07,410 --> 00:18:09,144 a point we call the aphelion. 327 00:18:09,245 --> 00:18:10,545 From that point on, 328 00:18:10,613 --> 00:18:14,749 it accelerates back towards the Sun, coming... 329 00:18:14,850 --> 00:18:17,719 back to its original position. 330 00:18:20,156 --> 00:18:23,391 With our newfound understanding of the dangers that lurk 331 00:18:23,492 --> 00:18:25,093 in the solar system, 332 00:18:25,161 --> 00:18:29,431 we do have to be aware that some of these bad omens 333 00:18:29,532 --> 00:18:33,768 indeed do turn out to have terrible effects 334 00:18:33,869 --> 00:18:37,105 on humans on Earth. 335 00:18:37,206 --> 00:18:40,141 While our ancestors feared comets, 336 00:18:40,242 --> 00:18:44,612 they were even more frightened of another bad omen in the sky... 337 00:18:44,714 --> 00:18:48,450 One that arrives with a sudden shadow and the terror 338 00:18:48,517 --> 00:18:53,221 of daytime turned into a potentially endless night. 339 00:18:56,826 --> 00:18:58,560 In the tenth century, 340 00:18:58,661 --> 00:19:03,264 a group of Vikings are on top of the world. 341 00:19:03,366 --> 00:19:06,368 They've set sail from what we would now call Norway 342 00:19:06,469 --> 00:19:09,137 and are bound for the Shetland Islands 343 00:19:09,238 --> 00:19:13,375 off the coast of modern-day Scotland. 344 00:19:13,476 --> 00:19:15,143 And while they may be ready 345 00:19:15,244 --> 00:19:17,278 for anything the North Sea can throw at them, 346 00:19:17,380 --> 00:19:20,081 nothing can prepare them for what is happening 347 00:19:20,182 --> 00:19:22,550 in the northern sky. 348 00:19:22,651 --> 00:19:27,088 One minute, bright sunlight. 349 00:19:27,189 --> 00:19:31,693 Then suddenly, a shadow starts to blot out the Sun. 350 00:19:31,794 --> 00:19:35,063 What's going on? 351 00:19:35,164 --> 00:19:38,099 Norse mythology tells of twin wolves 352 00:19:38,167 --> 00:19:40,268 who track the Sun and moon. 353 00:19:40,369 --> 00:19:43,505 When they catch them and devour them, 354 00:19:43,606 --> 00:19:47,342 that will signal the beginning of Ragnarok... 355 00:19:47,443 --> 00:19:49,611 The end of all things. 356 00:19:51,680 --> 00:19:55,350 For a Viking, the question he must face is simple 357 00:19:55,451 --> 00:19:56,684 yet chilling... 358 00:19:56,786 --> 00:19:58,653 is this it? 359 00:19:58,721 --> 00:20:02,056 With the midday sun getting darker by the second, 360 00:20:02,158 --> 00:20:05,193 is this the end of the world? 361 00:20:05,294 --> 00:20:07,462 This is the bad omen 362 00:20:07,563 --> 00:20:11,399 that is a solar eclipse. 363 00:20:11,500 --> 00:20:13,134 Historically, in China, 364 00:20:13,235 --> 00:20:15,970 people would go outside and bang pots, 365 00:20:16,071 --> 00:20:18,039 because they perceived the solar eclipse 366 00:20:18,140 --> 00:20:22,510 as a bad omen of a dragon consuming the Sun, 367 00:20:22,611 --> 00:20:26,581 and by banging the pots, they were scaring away the dragon. 368 00:20:28,417 --> 00:20:31,486 In the case of a total solar eclipse, 369 00:20:31,587 --> 00:20:33,588 it actually gets reasonably dark. 370 00:20:33,689 --> 00:20:36,658 It can last several minutes. 371 00:20:36,759 --> 00:20:40,929 You don't know that the Sun's gonna come back. 372 00:20:41,030 --> 00:20:43,097 You could go wild 373 00:20:43,199 --> 00:20:45,200 with uncertainty about your future, and, indeed, 374 00:20:45,301 --> 00:20:48,937 ancient cultures would sometimes react 375 00:20:49,038 --> 00:20:51,906 in very, very negative ways to an eclipse. 376 00:20:52,007 --> 00:20:54,909 There would be mass murders. 377 00:20:55,010 --> 00:20:56,478 All sorts of things could happen. 378 00:20:56,579 --> 00:20:58,379 Mayhem would break loose. 379 00:21:03,085 --> 00:21:06,254 In 585 BC, 380 00:21:06,355 --> 00:21:08,456 a six-year conflict 381 00:21:08,557 --> 00:21:11,593 near present-day Turkey 382 00:21:11,694 --> 00:21:16,564 is thrown into turmoil when the day becomes night. 383 00:21:19,134 --> 00:21:22,470 There's some evidence that on May 28, 585, 384 00:21:22,571 --> 00:21:25,573 a battle between the Lydians and the Medes 385 00:21:25,674 --> 00:21:29,143 was stopped because of a solar eclipse. 386 00:21:29,245 --> 00:21:31,980 They were into the sixth year battling each other, 387 00:21:32,081 --> 00:21:35,650 and near sunset, a solar eclipse occurred. 388 00:21:35,751 --> 00:21:38,286 The battlefield goes quiet, 389 00:21:38,387 --> 00:21:42,290 as all involved look to the heavens. 390 00:21:42,391 --> 00:21:44,359 And they said, "The gods are giving us a sign. 391 00:21:44,460 --> 00:21:46,361 We shouldn't be fighting." 392 00:21:46,462 --> 00:21:48,997 So they made a truce and even offered 393 00:21:49,098 --> 00:21:52,133 their own sons and daughters to the other side for marriage. 394 00:21:52,234 --> 00:21:54,469 That was a good thing, 395 00:21:54,570 --> 00:21:58,439 even though it was initially thought of as a bad omen. 396 00:21:58,541 --> 00:22:02,944 So what's really going on during a solar eclipse? 397 00:22:03,045 --> 00:22:05,280 A solar eclipse occurs 398 00:22:05,381 --> 00:22:08,416 when the moon goes exactly, 399 00:22:08,517 --> 00:22:12,287 or nearly exactly, between Earth and the Sun. 400 00:22:12,388 --> 00:22:14,222 So the moon's disc 401 00:22:14,323 --> 00:22:17,625 blocks part or all of the Sun's disc. 402 00:22:17,726 --> 00:22:21,462 And the Sun is so important in our lives that the idea 403 00:22:21,564 --> 00:22:24,666 of something going in front of it and blotting it out 404 00:22:24,767 --> 00:22:27,635 would be just a remarkable event. 405 00:22:27,736 --> 00:22:30,939 So you can imagine this would create fear, 406 00:22:31,040 --> 00:22:33,141 or perhaps it would be interpreted 407 00:22:33,242 --> 00:22:37,045 as a sign of something terrible to happen. 408 00:22:37,146 --> 00:22:38,646 But none of this would matter. 409 00:22:38,747 --> 00:22:41,082 Eclipses on Earth wouldn't be possible 410 00:22:41,183 --> 00:22:44,085 without an amazing coincidence. 411 00:22:44,186 --> 00:22:46,588 One that isn't duplicated anywhere else 412 00:22:46,689 --> 00:22:49,257 in our solar system. 413 00:22:49,358 --> 00:22:51,593 The sun and the moon just happen to be 414 00:22:51,694 --> 00:22:56,431 the same apparent size in our sky. 415 00:22:56,532 --> 00:22:59,133 That's because, while the moon's diameter 416 00:22:59,234 --> 00:23:02,604 is about 400 times smaller than the Sun's, 417 00:23:02,705 --> 00:23:07,442 the moon itself is 400 times closer to us. 418 00:23:07,543 --> 00:23:10,945 It's a celestial accident that the disc of the moon 419 00:23:11,046 --> 00:23:13,982 just covers the disc of the Sun. 420 00:23:14,083 --> 00:23:18,119 And so these eclipses have fascinated astronomers 421 00:23:18,220 --> 00:23:19,954 for thousands of years. 422 00:23:20,055 --> 00:23:22,290 The perfect fit of Earth's moon 423 00:23:22,391 --> 00:23:24,626 makes eclipses possible. 424 00:23:24,727 --> 00:23:27,228 But will that always be the case? 425 00:23:30,265 --> 00:23:33,167 Year by year, inch by inch, 426 00:23:33,268 --> 00:23:37,572 the moon is moving further away from Earth. 427 00:23:37,673 --> 00:23:40,341 Someday in the distant future, 428 00:23:40,442 --> 00:23:44,078 the moon will no longer completely block the Sun. 429 00:23:44,179 --> 00:23:46,581 The moon continues to go away from the Earth, 430 00:23:46,682 --> 00:23:49,083 appearing smaller and smaller in the sky. 431 00:23:49,184 --> 00:23:52,086 That means that in about half a billion years, 432 00:23:52,187 --> 00:23:55,490 total solar eclipses will no longer be possible. 433 00:23:55,591 --> 00:23:57,859 So we've lived in a special time 434 00:23:57,960 --> 00:24:01,262 where we can enjoy the beauty 435 00:24:01,363 --> 00:24:03,631 of what the ancients thought were bad omens, 436 00:24:03,732 --> 00:24:05,566 and we now understand them 437 00:24:05,668 --> 00:24:08,603 and can appreciate them for how beautiful and rare 438 00:24:08,704 --> 00:24:11,539 they really are. 439 00:24:11,640 --> 00:24:16,377 Our ancestors also saw lunar eclipses as a bad omen. 440 00:24:18,414 --> 00:24:21,282 A lunar eclipse foretold famine and disease, 441 00:24:21,383 --> 00:24:24,952 according to the Chinese. 442 00:24:25,054 --> 00:24:29,624 In Japan, lunar eclipses were associated with earthquakes 443 00:24:29,725 --> 00:24:33,461 and meant disaster was on the way. 444 00:24:33,562 --> 00:24:37,899 But does science support this superstition? 445 00:24:38,000 --> 00:24:42,637 If the sky turns dark, will the ground roll and roar? 446 00:24:46,975 --> 00:24:50,445 The ancients looked warily on the night sky, 447 00:24:50,546 --> 00:24:55,316 where sudden changes might foretell impending doom. 448 00:24:55,384 --> 00:24:59,387 The disappearance of the moon in a total lunar eclipse 449 00:24:59,455 --> 00:25:03,558 struck fear into our ancestors. 450 00:25:03,659 --> 00:25:06,227 But did it also, as some believed, 451 00:25:06,295 --> 00:25:09,564 cause earthquakes. 452 00:25:09,665 --> 00:25:11,599 Some people in Japan, in particular, 453 00:25:11,700 --> 00:25:15,403 have thought that total lunar eclipses cause 454 00:25:15,471 --> 00:25:18,039 bigger or more frequent earthquakes. 455 00:25:18,107 --> 00:25:22,176 So lunar eclipses were bad omens for that reason. 456 00:25:24,012 --> 00:25:27,248 December 21, 2010... 457 00:25:27,349 --> 00:25:30,852 For only the second time in the last two millennia, 458 00:25:30,919 --> 00:25:32,854 a lunar eclipse takes place 459 00:25:32,921 --> 00:25:36,524 on the day of the winter solstice. 460 00:25:36,625 --> 00:25:40,194 In Japan, a massive 7.4 earthquake 461 00:25:40,262 --> 00:25:44,866 triggers tsunami warnings along the coast. 462 00:25:44,967 --> 00:25:48,202 30 years prior, a 7.7 quake 463 00:25:48,270 --> 00:25:51,539 killed 25,000 people in Iran, 464 00:25:51,640 --> 00:25:53,875 just a few hours before the start 465 00:25:53,976 --> 00:25:56,911 of a total lunar eclipse. 466 00:25:57,012 --> 00:25:59,213 Could it be that when the Sun and moon 467 00:25:59,314 --> 00:26:01,215 are in perfect alignment, 468 00:26:01,316 --> 00:26:05,052 their combined gravity has enough influence on the Earth 469 00:26:05,154 --> 00:26:08,890 to trigger killer quakes? 470 00:26:08,991 --> 00:26:11,492 The truth is that if you look at long-term statistics, 471 00:26:11,593 --> 00:26:13,861 you don't see this. 472 00:26:13,962 --> 00:26:16,964 And physically, we can't think of a reason why 473 00:26:17,065 --> 00:26:19,567 a total lunar eclipse or a partial lunar eclipse 474 00:26:19,635 --> 00:26:21,569 would lead to more earthquakes. 475 00:26:21,637 --> 00:26:24,539 It's bunk, basically. 476 00:26:24,640 --> 00:26:26,407 A lunar eclipse happens 477 00:26:26,508 --> 00:26:29,443 when the Earth's shadow covers the moon. 478 00:26:30,979 --> 00:26:32,513 If the disappearance of the moon 479 00:26:32,614 --> 00:26:34,916 wasn't frightening enough to ancient eyes, 480 00:26:34,983 --> 00:26:36,851 during some eclipses, 481 00:26:36,952 --> 00:26:40,788 the moon actually changes color. 482 00:26:40,889 --> 00:26:43,391 When our moon passes through Earth's shadow, 483 00:26:43,492 --> 00:26:46,127 it can turn blood red. 484 00:26:46,228 --> 00:26:49,497 To the ancients, that was a bad omen. 485 00:26:49,598 --> 00:26:52,500 From the moon's perspective, during a total lunar eclipse, 486 00:26:52,601 --> 00:26:55,336 the moon is receiving the Sunlight 487 00:26:55,437 --> 00:26:59,307 of all the Sunrises and sunsets on Earth. 488 00:26:59,408 --> 00:27:03,044 And that light is predominantly orange or red, 489 00:27:03,145 --> 00:27:06,247 having traveled through all of that air 490 00:27:06,348 --> 00:27:09,317 and dust and whatnot in the atmosphere. 491 00:27:12,254 --> 00:27:14,422 As frightening as they were, 492 00:27:14,523 --> 00:27:17,024 some sky watchers eventually realized 493 00:27:17,125 --> 00:27:20,995 that eclipses were predictable. 494 00:27:21,063 --> 00:27:24,398 Omens in the sky are something that you can make use of. 495 00:27:24,499 --> 00:27:28,903 If you have superior knowledge of eclipses, you can use it. 496 00:27:28,971 --> 00:27:32,073 One person to take advantage of that knowledge, 497 00:27:32,140 --> 00:27:36,410 the famed explorer Christopher Columbus. 498 00:27:36,511 --> 00:27:39,914 In 1502, Columbus and his crew 499 00:27:40,015 --> 00:27:42,850 were stranded in Jamaica and running out of food. 500 00:27:42,951 --> 00:27:46,020 And the natives, basically, were no longer thinking 501 00:27:46,121 --> 00:27:49,090 that there is something special and God-like, 502 00:27:49,191 --> 00:27:52,426 you know? They were losing their oomph. 503 00:27:52,494 --> 00:27:57,064 Columbus is said to have access to a perpetual almanac 504 00:27:57,132 --> 00:27:59,467 that contained more than 300 pages 505 00:27:59,568 --> 00:28:01,903 of sky tables, charts, 506 00:28:02,004 --> 00:28:05,006 and eclipse forecasts. 507 00:28:05,107 --> 00:28:08,843 Columbus happened to know that there was a total lunar eclipse 508 00:28:08,944 --> 00:28:10,378 coming up the next night, 509 00:28:10,479 --> 00:28:13,147 and he told the natives that if they don't continue 510 00:28:13,215 --> 00:28:17,084 to provide food, the moon will go away. 511 00:28:17,185 --> 00:28:21,022 Sure enough, the next night, a lunar eclipse did occur, 512 00:28:21,123 --> 00:28:22,323 as predicted by Columbus. 513 00:28:22,391 --> 00:28:24,458 And so this raised him, 514 00:28:24,559 --> 00:28:26,394 his stature, in their eyes, 515 00:28:26,495 --> 00:28:29,597 and the next day they started providing goods and services 516 00:28:29,665 --> 00:28:33,034 once again. 517 00:28:33,135 --> 00:28:38,506 It's been said that all warfare is based on deception. 518 00:28:38,573 --> 00:28:41,842 And some of the world's greatest military leaders 519 00:28:41,944 --> 00:28:47,281 have used deceptions based on lunar eclipses. 520 00:28:47,382 --> 00:28:49,450 The famed T.E. Lawrence, 521 00:28:49,551 --> 00:28:52,253 better known as "Lawrence of Arabia," 522 00:28:52,354 --> 00:28:55,289 is said to have timed his assault on Aqaba 523 00:28:55,390 --> 00:28:58,125 to a lunar eclipse. 524 00:28:58,226 --> 00:29:00,494 Muslims Turks holding the town 525 00:29:00,562 --> 00:29:04,165 were distracted on the night of the eclipse. 526 00:29:04,266 --> 00:29:08,202 As was their tradition, they were busy making noises, 527 00:29:08,303 --> 00:29:10,905 firing rifles and banging pots 528 00:29:11,006 --> 00:29:15,142 in an effort to rescue the moon. 529 00:29:15,210 --> 00:29:19,080 Using his knowledge of science and superstition, 530 00:29:19,181 --> 00:29:22,383 Lawrence and his Arab fighters were victorious, 531 00:29:22,484 --> 00:29:25,720 taking the town without losing a single man. 532 00:29:29,024 --> 00:29:32,526 September 20, 331 B.C. 533 00:29:32,627 --> 00:29:35,129 Alexander the Great is outnumbered 534 00:29:35,197 --> 00:29:36,564 and headed for defeat 535 00:29:36,665 --> 00:29:40,568 at the hands of Emperor Darius of Persia. 536 00:29:40,669 --> 00:29:42,837 Alexander the Great was very smart. 537 00:29:42,938 --> 00:29:44,305 There's a lunar eclipse. 538 00:29:44,373 --> 00:29:46,273 You know it's an omen of something. 539 00:29:46,375 --> 00:29:49,276 You don't want your own army to become disheartened, 540 00:29:49,378 --> 00:29:53,280 so he used it as a propaganda coup. 541 00:29:53,382 --> 00:29:56,017 As the moon glows blood red, 542 00:29:56,118 --> 00:29:59,353 Alexander's secret weapon goes to work 543 00:29:59,454 --> 00:30:02,023 and the great leader launches a desperate plan 544 00:30:02,090 --> 00:30:04,925 to save himself, his men 545 00:30:05,027 --> 00:30:07,461 and his empire. 546 00:30:12,334 --> 00:30:15,836 In the ancient world, bad omens from the heavens 547 00:30:15,904 --> 00:30:19,840 were exploited to change history. 548 00:30:19,908 --> 00:30:22,243 On a battlefield in Mesopotamia, 549 00:30:22,344 --> 00:30:26,414 Alexander the Great turns a lunar eclipse 550 00:30:26,515 --> 00:30:29,216 into a weapon of fear. 551 00:30:29,284 --> 00:30:33,054 Alexander the Great spread word via his astrologers 552 00:30:33,155 --> 00:30:35,956 that the lunar eclipse meant that the Persians 553 00:30:36,058 --> 00:30:38,759 were going to lose. 554 00:30:38,827 --> 00:30:40,061 His men take heart, 555 00:30:40,162 --> 00:30:41,429 they make sure they spread this message 556 00:30:41,530 --> 00:30:42,963 to the enemy army... 557 00:30:45,367 --> 00:30:47,935 They lose heart. It's a fantastic coup 558 00:30:48,003 --> 00:30:50,438 in terms of undermining the enemy morale. 559 00:30:50,539 --> 00:30:54,175 Of course it helps them win the battle. 560 00:30:54,276 --> 00:30:56,243 The bad omen, paired with 561 00:30:56,344 --> 00:30:59,346 Alexander's tactical superiority 562 00:30:59,448 --> 00:31:02,450 is a devastating blow against the Persians 563 00:31:02,551 --> 00:31:05,019 as Alexander romps to victory 564 00:31:05,087 --> 00:31:07,221 and into history. 565 00:31:10,358 --> 00:31:12,493 Nearly 300 years later, 566 00:31:12,594 --> 00:31:14,462 another omen would play a part 567 00:31:14,529 --> 00:31:17,498 in history's most notorious betrayal 568 00:31:17,599 --> 00:31:20,868 and assassination. 569 00:31:21,615 --> 00:31:24,851 From a hilltop in the mountains north of Rome, 570 00:31:24,952 --> 00:31:28,054 observers gather and watch with trepidation 571 00:31:28,155 --> 00:31:32,825 as an unblinking red dot rises in the night sky. 572 00:31:36,130 --> 00:31:40,867 The date, March 15, 44 B.C. 573 00:31:40,968 --> 00:31:42,135 The Ides of March. 574 00:31:48,675 --> 00:31:51,344 Julius Caesar is dead. 575 00:31:51,411 --> 00:31:56,048 And now, it appears Mars is angry. 576 00:31:56,150 --> 00:31:58,785 The Roman had whole colleges of priests 577 00:31:58,852 --> 00:32:01,587 who were responsible for interpreting the omens. 578 00:32:01,688 --> 00:32:03,756 Omens in the sky, omens from the birds, 579 00:32:03,857 --> 00:32:06,359 omens everywhere. They were the guys you went to. 580 00:32:06,460 --> 00:32:08,895 What does it mean? 581 00:32:08,996 --> 00:32:12,765 On the night of Caesar's death, 582 00:32:12,866 --> 00:32:16,502 it was said that Mars was especially bright and red, 583 00:32:16,570 --> 00:32:21,574 as though marking a triumph over the emperor. 584 00:32:21,675 --> 00:32:24,010 More than 2,000 years later, 585 00:32:24,111 --> 00:32:28,548 we know Mars isn't red because it's angry. 586 00:32:28,649 --> 00:32:31,551 Mars is red, literally, 587 00:32:31,652 --> 00:32:34,687 because it is rusty. 588 00:32:34,755 --> 00:32:37,590 There's leftover water on the surface of Mars 589 00:32:37,658 --> 00:32:39,358 and below the surface. 590 00:32:39,459 --> 00:32:41,928 Leftover from when Mars formed. 591 00:32:42,029 --> 00:32:44,831 And it rusts or oxidizes 592 00:32:44,898 --> 00:32:47,834 the iron in the surface. 593 00:32:49,803 --> 00:32:53,072 But why would Mars be brighter on certain nights, 594 00:32:53,173 --> 00:32:57,043 giving it extra power as an omen? 595 00:32:57,110 --> 00:33:00,446 The distance between Earth and Mars varies 596 00:33:00,547 --> 00:33:03,649 as the two planets orbit the Sun. 597 00:33:03,750 --> 00:33:05,051 Earth circles the Sun 598 00:33:05,118 --> 00:33:08,988 once every 365 days. 599 00:33:09,089 --> 00:33:12,925 Mars takes 687 days, 600 00:33:13,026 --> 00:33:16,362 meaning that at some times during their orbits, 601 00:33:16,463 --> 00:33:20,533 Earth is getting closer and closer to Mars. 602 00:33:20,634 --> 00:33:22,969 Finally, the planets reach the phase 603 00:33:23,070 --> 00:33:25,571 astronomers call opposition. 604 00:33:25,639 --> 00:33:30,409 That's when Mars and the Sun are on opposite sides of the Earth. 605 00:33:30,477 --> 00:33:34,480 It is during opposition that Mars is closest to Earth 606 00:33:34,548 --> 00:33:37,683 and shines its brightest. 607 00:33:37,751 --> 00:33:40,820 When the Sun is directly between Mars and Earth, 608 00:33:40,921 --> 00:33:43,723 the planets are farthest away from each other, 609 00:33:43,824 --> 00:33:45,858 about seven times farther 610 00:33:45,926 --> 00:33:47,994 than they were during opposition. 611 00:33:51,632 --> 00:33:54,433 Ancient observers often saw omens 612 00:33:54,534 --> 00:33:56,435 in the bright celestial objects 613 00:33:56,536 --> 00:34:00,873 we know today as planets. 614 00:34:00,974 --> 00:34:03,009 But could a planet be responsible for 615 00:34:03,110 --> 00:34:04,543 an ancient mystery 616 00:34:04,645 --> 00:34:05,645 buried in the jungles 617 00:34:05,746 --> 00:34:09,048 of Mexico's Yucatan Peninsula? 618 00:34:09,149 --> 00:34:12,485 For years, archaeologists studying the Mayan ruins 619 00:34:12,552 --> 00:34:14,587 at Chichen Itza 620 00:34:14,688 --> 00:34:17,924 wondered why twin staircases on one of the buildings 621 00:34:17,991 --> 00:34:20,559 are out of alignment. 622 00:34:20,627 --> 00:34:23,796 Could it be somehow connected to the astronomer priests 623 00:34:23,897 --> 00:34:28,834 who wielded tremendous power in Mayan culture? 624 00:34:28,936 --> 00:34:30,870 By offsetting the stairs, 625 00:34:30,971 --> 00:34:35,041 what message were they trying to send across the centuries? 626 00:34:35,142 --> 00:34:38,277 We do know this... 627 00:34:38,345 --> 00:34:43,316 the Mayans called Venus "the great star." 628 00:34:43,417 --> 00:34:45,618 Mayan leaders would always account for 629 00:34:45,719 --> 00:34:47,053 the position of Venus 630 00:34:47,154 --> 00:34:51,324 in their calculations for battles and raids. 631 00:34:51,425 --> 00:34:53,693 When Venus is close to the horizon, 632 00:34:53,794 --> 00:34:56,295 it can shimmer, it can change colors. 633 00:34:56,363 --> 00:34:59,365 Venus has been reported as a UFO 634 00:34:59,433 --> 00:35:02,735 more times than any other object in the universe. 635 00:35:02,803 --> 00:35:04,870 You can imagine, to the ancients, when it was doing 636 00:35:04,972 --> 00:35:07,773 those weird things, those twinkling and changing colors, 637 00:35:07,874 --> 00:35:11,544 that could be seen as a bad omen. 638 00:35:11,611 --> 00:35:14,046 The Mayans would actually block their chimneys, 639 00:35:14,147 --> 00:35:18,017 so what they feared as the evil light from Venus 640 00:35:18,118 --> 00:35:20,453 couldn't get into their homes. 641 00:35:20,520 --> 00:35:22,822 If you look at Venus, orbit after orbit, 642 00:35:22,889 --> 00:35:24,824 month after month, you'll notice that 643 00:35:24,891 --> 00:35:27,760 it traces out a pattern in the sky. 644 00:35:27,861 --> 00:35:29,996 These different patterns are actually reflected 645 00:35:30,063 --> 00:35:33,265 in Mayan architecture. 646 00:35:33,333 --> 00:35:36,002 And so, the mysterious message 647 00:35:36,069 --> 00:35:38,771 is revealed. 648 00:35:38,872 --> 00:35:41,374 The misalignment of the grand staircase 649 00:35:41,475 --> 00:35:43,442 at El Caracol, 650 00:35:43,510 --> 00:35:46,545 an ancient Mayan observatory, 651 00:35:46,613 --> 00:35:48,981 actually matches perfectly 652 00:35:49,049 --> 00:35:51,984 with Venus's most northern appearance in the sky. 653 00:35:56,490 --> 00:35:59,825 Bright lights in the sky always attracted the attention 654 00:35:59,926 --> 00:36:02,828 of our ancient ancestors. 655 00:36:02,929 --> 00:36:05,698 And while some were merely ominous, 656 00:36:05,799 --> 00:36:10,036 others crackled with the threat 657 00:36:10,137 --> 00:36:12,605 of imminent attack. 658 00:36:20,847 --> 00:36:23,916 Darkness reigns. 659 00:36:23,984 --> 00:36:26,786 Polar bears are common here. 660 00:36:26,887 --> 00:36:28,554 So, too, are elk 661 00:36:28,622 --> 00:36:30,556 and other dangerous creatures 662 00:36:30,624 --> 00:36:33,926 that serve as both predator and prey 663 00:36:34,027 --> 00:36:38,964 for the hearty few who make this land their home. 664 00:36:39,066 --> 00:36:41,967 It is dark and scary 665 00:36:42,069 --> 00:36:47,640 and potentially deadly. 666 00:36:47,707 --> 00:36:53,045 Suddenly, a man out hunting sees it, 667 00:36:53,146 --> 00:36:57,149 a threat known to his people since ancient times. 668 00:36:59,519 --> 00:37:01,554 So he does what comes naturally, 669 00:37:01,655 --> 00:37:07,393 what generations of native Alaskans have done before him. 670 00:37:07,461 --> 00:37:08,761 He draws his weapon 671 00:37:08,862 --> 00:37:10,996 and prepares to defend himself 672 00:37:11,064 --> 00:37:13,365 from the swirling electrical madness 673 00:37:13,467 --> 00:37:17,403 he sees in the skies. 674 00:37:17,504 --> 00:37:19,538 Blazing lights. 675 00:37:19,606 --> 00:37:23,609 A mysterious and ever-changing symphony of color. 676 00:37:26,580 --> 00:37:31,684 Today, we know this phenomenon as the aurora borealis, 677 00:37:31,785 --> 00:37:35,387 the Northern Lights. 678 00:37:35,489 --> 00:37:38,324 And for many cultures, like the Eskimos 679 00:37:38,425 --> 00:37:41,527 living near Barrow, Alaska, 680 00:37:41,595 --> 00:37:46,899 the aurora is a bad omen. 681 00:37:46,967 --> 00:37:49,435 Auroras, the northern or southern lights, 682 00:37:49,503 --> 00:37:52,004 have often been seen as bad omens because 683 00:37:52,105 --> 00:37:54,373 there are these ghostly lights in the sky 684 00:37:54,474 --> 00:37:57,443 and they're flickering and they're of unknown origin 685 00:37:57,544 --> 00:37:58,944 to the people watching them. 686 00:37:59,045 --> 00:38:01,981 Are the gods angry or something? 687 00:38:02,048 --> 00:38:07,353 So what causes this sparkling show in the sky? 688 00:38:07,454 --> 00:38:09,488 Aurorae are fascinating examples 689 00:38:09,589 --> 00:38:11,490 of the interaction between 690 00:38:11,591 --> 00:38:14,894 the Sun and us here on Earth. 691 00:38:14,995 --> 00:38:17,463 The sun has what we call space weather. 692 00:38:17,564 --> 00:38:21,333 These are solar flares or other phenomena associated with 693 00:38:21,401 --> 00:38:23,068 the Sun's magnetic activity 694 00:38:23,136 --> 00:38:26,972 that shower our planet with not only high energy radiation 695 00:38:27,040 --> 00:38:29,808 but also energetic particles. 696 00:38:29,910 --> 00:38:32,778 Earth has a magnetic field. 697 00:38:32,846 --> 00:38:35,047 Now, if that magnetic field was in isolation, 698 00:38:35,115 --> 00:38:37,349 it would look sort of like a cored apple. 699 00:38:37,450 --> 00:38:39,418 But it's not in isolation. 700 00:38:39,486 --> 00:38:42,521 The solar wind charged particles streaming out of the Sun 701 00:38:42,622 --> 00:38:44,356 impinges upon Earth, 702 00:38:44,457 --> 00:38:47,626 flattening the nearside and extending the farside 703 00:38:47,727 --> 00:38:48,928 of that field. 704 00:38:49,029 --> 00:38:50,696 It also has holes at 705 00:38:50,764 --> 00:38:52,364 the north and the south 706 00:38:52,465 --> 00:38:53,933 called polar cusps. 707 00:38:54,034 --> 00:38:56,769 Solar wind can flow into the polar cusps, 708 00:38:56,836 --> 00:38:59,338 creating the aurora borealis 709 00:38:59,439 --> 00:39:01,807 and the aurora australis. 710 00:39:01,908 --> 00:39:04,677 As they excite the gases in our atmosphere, 711 00:39:04,744 --> 00:39:06,645 depending upon the gases that get excited, 712 00:39:06,746 --> 00:39:08,714 you get different colors. 713 00:39:08,815 --> 00:39:11,917 These different gases are exactly what are used to make 714 00:39:12,018 --> 00:39:14,453 the neon signs that we see down at the deli. 715 00:39:14,554 --> 00:39:18,724 When you see that green palm tree or that red open sign, 716 00:39:18,825 --> 00:39:21,527 those are different gases being energized 717 00:39:21,628 --> 00:39:23,462 and it's the light escaping 718 00:39:23,563 --> 00:39:25,898 as the electrons change energy levels 719 00:39:25,999 --> 00:39:29,501 that we perceive as these different colors. 720 00:39:29,569 --> 00:39:32,805 The spectacular light show an aurora provides 721 00:39:32,906 --> 00:39:36,041 isn't the only way to experience one. 722 00:39:36,109 --> 00:39:41,647 As it turns out, you can actually hear an aurora too. 723 00:39:41,748 --> 00:39:44,583 There have always been stories of people hearing sounds 724 00:39:44,651 --> 00:39:46,518 associated with the aurora. 725 00:39:46,620 --> 00:39:49,054 Popping and whistling noises. 726 00:39:49,155 --> 00:39:52,558 But it was unclear if these were just stories 727 00:39:52,659 --> 00:39:55,060 or real, until recently 728 00:39:55,161 --> 00:39:57,529 when scientists were finally able to record 729 00:39:57,631 --> 00:39:59,632 that, under very certain circumstances, 730 00:39:59,733 --> 00:40:02,001 you can hear whistling and popping noises 731 00:40:02,102 --> 00:40:04,737 associated with the Sun's energy interacting with 732 00:40:04,838 --> 00:40:06,839 our own Earth's atmosphere. 733 00:40:06,906 --> 00:40:11,076 What causes the sound is still a bit of a mystery. 734 00:40:11,177 --> 00:40:14,380 Researchers think the same solar energy waves 735 00:40:14,447 --> 00:40:17,449 that generate the spectacular lights in the sky 736 00:40:17,550 --> 00:40:22,721 are also responsible for the sounds closer to the ground. 737 00:40:22,822 --> 00:40:26,425 The phenomenon of auroras is an ancient mystery 738 00:40:26,526 --> 00:40:30,329 that stretches across the cosmos. 739 00:40:30,430 --> 00:40:34,033 Jupiter has amazing aurorae that we see on a regular basis. 740 00:40:34,134 --> 00:40:35,801 Saturn has aurorae. 741 00:40:35,902 --> 00:40:38,871 And even Venus. 742 00:40:38,972 --> 00:40:42,508 Omens, portents, and signs 743 00:40:42,609 --> 00:40:46,812 are how ancient people made sense of their universe. 744 00:40:46,913 --> 00:40:50,949 Today, astronomers are making remarkable discoveries 745 00:40:51,051 --> 00:40:53,619 that help explain the science behind 746 00:40:53,720 --> 00:40:56,355 these once terrifying events. 747 00:40:56,456 --> 00:40:58,090 One of the things that's really amazing about 748 00:40:58,158 --> 00:41:01,360 the time that we live in, is that all of these things 749 00:41:01,428 --> 00:41:03,929 that were very scary for our ancestors 750 00:41:03,997 --> 00:41:07,499 we now understand through the lens of science. 751 00:41:07,600 --> 00:41:10,736 Humans always want to know about the future. 752 00:41:10,804 --> 00:41:14,707 Whether you're an ancient Roman, an ancient Chinese, 753 00:41:14,808 --> 00:41:17,509 a person living in America in the 21st century, 754 00:41:17,610 --> 00:41:21,413 we want to look for signs in nature, signs in the heavens, 755 00:41:21,514 --> 00:41:23,749 that can help us understand things, 756 00:41:23,850 --> 00:41:25,718 can reassure us that we know 757 00:41:25,785 --> 00:41:28,287 what will happen in the future. 758 00:41:28,388 --> 00:41:30,055 As we learn more about the universe, 759 00:41:30,156 --> 00:41:32,791 knowledge is replacing fear. 760 00:41:32,892 --> 00:41:35,627 People go north to see the aurora. 761 00:41:35,695 --> 00:41:37,396 They take eclipse cruises. 762 00:41:37,497 --> 00:41:42,301 Yesterday's bad omens are today's tourist attractions. 763 00:41:42,402 --> 00:41:47,373 This, then, is humanity at the dawn of the 21st century, 764 00:41:47,474 --> 00:41:49,975 striving to understand and experience first hand 765 00:41:50,076 --> 00:41:52,978 what men and women through the millennia 766 00:41:53,046 --> 00:41:56,048 formerly saw as bad omens. 58382

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