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These are the user uploaded subtitles that are being translated: 1 00:01:32,840 --> 00:01:35,480 We were born into a mystery... 2 00:01:35,641 --> 00:01:39,441 one that has haunted us since at least as long as we've been human. 3 00:01:42,081 --> 00:01:47,442 We awakened on this tiny world beneath a blanket of stars... 4 00:01:48,041 --> 00:01:50,762 like an abandoned baby left on a doorstep... 5 00:01:50,921 --> 00:01:55,602 without a note to explain where we came from, who we are... 6 00:01:56,082 --> 00:01:58,762 how our universe came to be... 7 00:01:58,922 --> 00:02:03,002 and with no idea how to end our cosmic isolation. 8 00:02:03,483 --> 00:02:07,643 We've had to figure it all out for ourselves. 9 00:02:11,964 --> 00:02:15,323 Best thing we had going for us was our intelligence... 10 00:02:15,484 --> 00:02:18,884 especially our gift for pattern recognition... 11 00:02:19,044 --> 00:02:21,084 sharpened over eons of evolution. 12 00:02:21,885 --> 00:02:24,765 The ones who were good at spotting prey and predator... 13 00:02:24,924 --> 00:02:27,524 telling poisonous plants from the nourishing ones... 14 00:02:27,685 --> 00:02:30,605 had a better chance to live and reproduce. 15 00:02:30,765 --> 00:02:34,045 They survived and passed on those genes for pattern recognition... 16 00:02:34,206 --> 00:02:36,126 with its obvious advantages. 17 00:02:36,566 --> 00:02:40,886 Cultures all over the planet looked up at the same stars... 18 00:02:41,046 --> 00:02:44,326 and found different pictures there. 19 00:02:50,207 --> 00:02:53,047 We used this gift for recognizing patterns in nature... 20 00:02:53,207 --> 00:02:56,327 to read the calendar in the sky. 21 00:02:58,407 --> 00:03:02,488 The messages written in the stars told our forefathers and mothers... 22 00:03:02,647 --> 00:03:05,448 when to camp and when to move on... 23 00:03:05,608 --> 00:03:08,929 when the migratory herds and when the rains and the cold would come... 24 00:03:09,088 --> 00:03:11,129 and when they would cease for a time. 25 00:03:11,288 --> 00:03:14,369 When they observed the connection between the motions of the stars... 26 00:03:14,529 --> 00:03:16,569 and the seasonal cycles of life on Earth... 27 00:03:16,729 --> 00:03:19,890 the y concluded, naturally, that what happens up there... 28 00:03:20,050 --> 00:03:22,610 must be directed at us down here. 29 00:03:22,770 --> 00:03:24,169 It makes sense, right? 30 00:03:24,329 --> 00:03:28,410 If the sky was a calendar and somebody stuck a Post-it note on top of it... 31 00:03:28,570 --> 00:03:31,770 what else could it be but a message? 32 00:03:32,450 --> 00:03:35,010 And so when the heavenly order was suddenly violated... 33 00:03:35,170 --> 00:03:39,891 by the apparition of a comet in the sky, they took it personally. 34 00:03:40,051 --> 00:03:41,731 Can we really blame them? 35 00:03:41,891 --> 00:03:45,731 Back then, they had no other logical explanation for what was happening. 36 00:03:45,891 --> 00:03:48,692 This was long before anyone had yet to imagine Earth... 37 00:03:48,852 --> 00:03:52,612 as a spinning planet with a tilted axis, revolving around the sun. 38 00:03:52,772 --> 00:03:56,373 Every ancient human culture made the same mistake: 39 00:03:56,533 --> 00:04:01,092 The comet must be a message sent by the gods, or one particular god. 40 00:04:01,253 --> 00:04:07,973 And almost invariably our ancestors concluded the news was not good. 41 00:04:08,133 --> 00:04:14,854 It didn't matter if you were an ancient Aztec, Anglo-Saxon, Babylonian, Hindu. 42 00:04:15,174 --> 00:04:18,335 Comets were portents of doom. 43 00:04:18,494 --> 00:04:23,815 The only difference among them was the precise nature of the coming disaster. 44 00:04:23,974 --> 00:04:28,535 "Disaster, " as in the Greek word for "bad star." 45 00:04:28,695 --> 00:04:31,975 To the Masai of East Africa, a comet meant famine. 46 00:04:32,135 --> 00:04:34,896 To the Zulu in the south, it meant war. 47 00:04:35,056 --> 00:04:38,375 To the Eghap people of the west, it meant disease. 48 00:04:38,536 --> 00:04:43,017 To the Djaga of Zaire, specifically smallpox. 49 00:04:43,176 --> 00:04:48,656 To their neighbors, the Lube, a comet foretold the death of a leader. 50 00:04:48,816 --> 00:04:52,297 The ancient Chinese were remarkably systematic. 51 00:04:53,337 --> 00:04:55,817 Starting in roughly 1400 BC... 52 00:04:55,977 --> 00:04:59,937 they began recording and cataloging the apparitions of comets. 53 00:05:00,098 --> 00:05:03,218 A three-tailed comet meant calamity for the state. 54 00:05:03,378 --> 00:05:07,258 A four-tailed comet signified an epidemic was coming. 55 00:05:07,419 --> 00:05:11,379 The human talent for pattern recognition is a two-edged sword. 56 00:05:11,539 --> 00:05:16,459 We're especially good at finding patterns even when they aren't really there... 57 00:05:16,620 --> 00:05:20,420 something known as "false pattern recognition." 58 00:05:22,979 --> 00:05:25,019 We hunger for significance... 59 00:05:25,180 --> 00:05:30,540 for signs that our personal existence is of special meaning to the universe. 60 00:05:32,261 --> 00:05:36,581 To that end, we're all too eager to deceive ourselves and others... 61 00:05:36,741 --> 00:05:39,661 to discern a sacred image in a grilled cheese sandwich... 62 00:05:39,821 --> 00:05:42,861 or find a divine warning in a comet. 63 00:05:43,021 --> 00:05:45,422 Today we know exactly where comets come from... 64 00:05:45,581 --> 00:05:47,982 and what they're made of. 65 00:05:50,382 --> 00:05:52,262 Our Ship of the Imagination... 66 00:05:52,423 --> 00:05:55,823 fueled by equal parts of science and wonder... 67 00:05:55,983 --> 00:05:59,623 can take us anywhere in space and time. 68 00:05:59,783 --> 00:06:01,383 It can travel faster than light... 69 00:06:01,543 --> 00:06:05,103 and render visible those things that cannot be seen. 70 00:06:05,263 --> 00:06:10,744 It's carrying us to a mysterious realm that lies one light-year from the sun. 71 00:06:10,904 --> 00:06:13,104 What is this swarm of worlds? 72 00:06:13,264 --> 00:06:15,504 Was it organized by alien beings? 73 00:06:15,664 --> 00:06:18,185 No, just gravity. 74 00:06:18,345 --> 00:06:20,625 These are the snows of yesteryear. 75 00:06:20,785 --> 00:06:23,465 Drifting mountains of ice and rock. 76 00:06:23,625 --> 00:06:26,385 The preserved remnants of the birth of the solar system. 77 00:06:26,545 --> 00:06:29,785 It's called the Oort cloud, after Jan Oort... 78 00:06:29,945 --> 00:06:34,306 the Dutch astronomer who foretold its existence back in 1950. 79 00:06:34,466 --> 00:06:36,546 He was trying to solve a paradox. 80 00:06:36,706 --> 00:06:39,826 There's so many ways for comets to die. 81 00:06:39,986 --> 00:06:44,146 Because they cross the orbits of planets, comets frequently collide with them. 82 00:06:45,106 --> 00:06:48,747 Comets are largely made of ice, so every time they come near the sun... 83 00:06:48,907 --> 00:06:51,787 they lose a part of themselves through evaporation. 84 00:06:51,948 --> 00:06:55,947 And after several thousand trips, their ice is all gone... 85 00:06:56,107 --> 00:06:58,708 and what remains of the comet is now an asteroid. 86 00:06:58,868 --> 00:07:01,708 Comets can be gravitationally ejected from the solar system... 87 00:07:01,868 --> 00:07:03,388 and exiled into space. 88 00:07:03,548 --> 00:07:07,309 And yet somehow the comets keep coming. 89 00:07:07,468 --> 00:07:11,509 Oort and other astronomers wondered, "Where do all the comets come from?" 90 00:07:13,789 --> 00:07:16,549 Oort calculated the rate at which new comets appear... 91 00:07:16,709 --> 00:07:20,590 and concluded that there must be a vast spherical swarm of them... 92 00:07:20,750 --> 00:07:24,670 a few light-years across, surrounding the sun. 93 00:07:27,751 --> 00:07:29,590 Oort's logic still holds up... 94 00:07:29,750 --> 00:07:32,391 even after all the discoveries we've made about comets... 95 00:07:32,551 --> 00:07:35,111 and the solar system in the many decades since. 96 00:07:35,271 --> 00:07:40,752 And yet the Oort cloud is a sight that no one has ever seen. 97 00:07:41,152 --> 00:07:44,032 Nor could we. It's dark out here. 98 00:07:44,192 --> 00:07:47,072 And each comet is about as far from its closest neighbor... 99 00:07:47,231 --> 00:07:49,032 as the Earth is from Saturn. 100 00:07:49,192 --> 00:07:52,312 But science gives us special powers of our own. 101 00:07:52,472 --> 00:07:55,912 It gave Jan Oort the gift of prophecy. 102 00:07:56,073 --> 00:07:58,513 Oort was also the first to correctly estimate... 103 00:07:58,673 --> 00:08:01,593 the distance between the sun and the center of our galaxy. 104 00:08:02,233 --> 00:08:05,753 That's a big deal, finding out where we are in the Milky Way. 105 00:08:05,913 --> 00:08:10,074 Our star is about 30, 000 light-years from the center. 106 00:08:10,234 --> 00:08:12,794 Oort was also the first guy to use a radio telescope... 107 00:08:12,954 --> 00:08:15,154 to map the galaxy's spiral structure. 108 00:08:15,714 --> 00:08:21,355 And he discovered that the center of our galaxy was a place of titanic explosions... 109 00:08:21,515 --> 00:08:23,688 the first indication that there might have 110 00:08:23,699 --> 00:08:26,036 been a supermassive black hole lurking there. 111 00:08:26,195 --> 00:08:29,115 Does the fact that most of us know the names of mass murderers... 112 00:08:29,275 --> 00:08:33,716 but have never heard of Jan Oort, say anything about us? 113 00:08:42,477 --> 00:08:44,477 The Oort cloud is so enormous... 114 00:08:44,637 --> 00:08:47,477 that it takes one of its comets about a million years... 115 00:08:47,637 --> 00:08:51,157 to complete a single trip around the sun. 116 00:08:53,117 --> 00:08:55,638 Out here at the far edge of the solar system... 117 00:08:55,798 --> 00:08:58,758 even a little tug from the gravity of a passing star... 118 00:08:58,918 --> 00:09:04,038 can liberate some of these comets from their gravitational bondage to the sun. 119 00:09:07,198 --> 00:09:11,359 Some comets are flung out of the solar system to wander interstellar space. 120 00:09:11,519 --> 00:09:15,000 But for others there's a different fate. 121 00:09:20,960 --> 00:09:25,600 This one is plunging towards the sun, gaining speed in an unbroken free fall... 122 00:09:25,760 --> 00:09:28,880 that lasts hundreds of thousands of years. 123 00:09:29,681 --> 00:09:35,361 When Neptune's gravity gives it another tug, there's a small change in course. 124 00:09:35,521 --> 00:09:39,402 Mighty Jupiter, the most massive object in our solar system other than the sun... 125 00:09:39,561 --> 00:09:42,762 attracts the comet with its powerful gravitational pull... 126 00:09:42,922 --> 00:09:45,282 bending its path. 127 00:09:48,122 --> 00:09:52,163 When our comet reaches the inner solar system... 128 00:09:53,562 --> 00:09:57,043 heat from the sun bakes it. 129 00:10:04,443 --> 00:10:07,563 A beautiful transformation begins. 130 00:10:07,724 --> 00:10:12,804 The barren, sooty iceberg now sports a glowing halo... 131 00:10:13,604 --> 00:10:15,524 and a tail. 132 00:10:22,085 --> 00:10:24,925 These layers tell the story of how the comet was made... 133 00:10:25,086 --> 00:10:28,086 some 4 billion years ago. 134 00:10:32,206 --> 00:10:35,046 During the 40,000 generations of humanity... 135 00:10:35,206 --> 00:10:40,287 there must have been roughly 100,000 apparitions of a bright comet. 136 00:10:40,766 --> 00:10:45,927 For all that time, the best we could do was look up in helpless wonder... 137 00:10:46,087 --> 00:10:49,127 prisoners of Earth with nowhere to turn for an explanation... 138 00:10:49,287 --> 00:10:52,088 beyond our guilt and our fears. 139 00:10:52,967 --> 00:10:56,008 But then a friendship began between two men... 140 00:10:56,168 --> 00:10:59,888 that led to a permanent revolution in human thought. 141 00:11:00,848 --> 00:11:03,808 Isaac Newton and Edmond Halley could not know it... 142 00:11:03,968 --> 00:11:07,208 but their collaboration would ultimately set us free... 143 00:11:07,369 --> 00:11:11,850 from our long confinement on this tiny world. 144 00:11:17,929 --> 00:11:22,490 The comet of 1664 sent shivers of dread throughout Europe. 145 00:11:22,650 --> 00:11:24,770 And the terror seemed justified... 146 00:11:24,930 --> 00:11:28,490 when the plague and the Great Fire of London followed soon after. 147 00:11:29,891 --> 00:11:33,011 There, with long bloody hair... 148 00:11:33,171 --> 00:11:36,691 a blazing star threatens the world... 149 00:11:36,851 --> 00:11:41,612 with famine, plague and war. 150 00:11:42,451 --> 00:11:45,492 To princes, it spells death. 151 00:11:46,092 --> 00:11:49,092 To kingdoms, many crosses. 152 00:11:50,412 --> 00:11:53,452 To all estates, inevitable losses. 153 00:11:54,293 --> 00:11:56,173 To herdsmen, rot. 154 00:11:56,333 --> 00:11:58,733 To plowmen, hapless seasons. 155 00:11:59,773 --> 00:12:03,134 To sailors, it brings storms. 156 00:12:04,614 --> 00:12:08,494 To cities, civil treasons. 157 00:12:14,095 --> 00:12:15,335 But for one child... 158 00:12:16,175 --> 00:12:19,055 the comet was not the least bit frightening. 159 00:12:23,856 --> 00:12:27,215 For him, it was a thing of wonder. 160 00:12:27,376 --> 00:12:31,096 Like all of us, Edmond Halley was born curious. 161 00:12:31,256 --> 00:12:32,896 Hell's bells. 162 00:12:33,737 --> 00:12:37,577 He was lucky to have a father who encouraged and nurtured his curiosity... 163 00:12:37,736 --> 00:12:41,777 buying him the best scientific instruments, and even funding his expedition... 164 00:12:41,937 --> 00:12:45,457 to make the first accurate star map of the Southern Hemisphere. 165 00:12:45,617 --> 00:12:49,297 Halley dropped out of Oxford when he was 20 and sailed to St. Helena... 166 00:12:49,458 --> 00:12:52,258 an island below the equator, off the west coast of Africa. 167 00:12:58,419 --> 00:13:00,658 Hell's bells. 168 00:13:00,818 --> 00:13:03,859 Problem was, nobody told Halley that the weather on St. Helena... 169 00:13:04,019 --> 00:13:07,659 was generally lousy. It took him 12 frustrating months... 170 00:13:07,819 --> 00:13:12,179 to observe enough southern stars to make a complete map. 171 00:13:12,940 --> 00:13:14,939 The gods and heroes of ancient Greece... 172 00:13:15,100 --> 00:13:19,100 were now joined by the mythic figures of a new world and age: 173 00:13:19,260 --> 00:13:23,980 a toucan, a compass, a bird of paradise. 174 00:13:31,581 --> 00:13:34,101 When Halley came home with the other half of the sky... 175 00:13:34,261 --> 00:13:36,301 his map created a sensation. 176 00:13:36,461 --> 00:13:39,142 Now merchants and explorers could navigate by the stars... 177 00:13:39,302 --> 00:13:40,942 visible anywhere on Earth. 178 00:13:41,101 --> 00:13:43,222 At the time, the Royal Society of London... 179 00:13:43,382 --> 00:13:46,023 was the world's clearinghouse of scientific discovery. 180 00:13:46,182 --> 00:13:51,343 It's motto, "Nullius in verba," sums up the heart of the scientific method. 181 00:13:51,503 --> 00:13:54,223 It's Latin for "see for yourself." 182 00:13:54,383 --> 00:13:57,743 In other words, question authority. 183 00:13:57,903 --> 00:14:01,784 Halley's star maps caught the attention of the Society's curator of experiments. 184 00:14:01,943 --> 00:14:04,310 I'd show him to you if I could, but no portrait 185 00:14:04,322 --> 00:14:06,304 of Robert Hooke exists from his time... 186 00:14:06,464 --> 00:14:08,984 only the verbal descriptions of his contemporaries. 187 00:14:09,144 --> 00:14:12,185 They called him "lean, bent, ugly." 188 00:14:12,345 --> 00:14:15,384 He was possibly the most inventive person who ever lived. 189 00:14:15,544 --> 00:14:20,105 And despite his appearance, he was the most sought-after party guest in all of London. 190 00:14:20,265 --> 00:14:26,746 Why? Hooke's insatiable curiosity encompassed absolutely everything. 191 00:14:28,106 --> 00:14:30,506 Hooke discovered a little cosmos... 192 00:14:30,666 --> 00:14:34,746 and we still call it by the name he gave it: the cell. 193 00:14:34,906 --> 00:14:36,824 Hooke discovered the cell by looking at a 194 00:14:36,835 --> 00:14:38,947 piece of cork with one of his own inventions: 195 00:14:39,106 --> 00:14:40,667 the compound microscope. 196 00:14:41,267 --> 00:14:46,827 He anticipated aspects of Darwin's theory of evolution by almost 200 years. 197 00:14:46,987 --> 00:14:48,828 Hooke also improved the telescope. 198 00:14:48,987 --> 00:14:51,748 The drawings he made of the astronomical bodies he observed... 199 00:14:51,908 --> 00:14:54,148 attest to his uncanny precision. 200 00:14:54,308 --> 00:14:58,108 After the Great Fire destroyed central London in 1666... 201 00:14:58,269 --> 00:15:00,788 Hooke partnered with the architect Christopher Wren... 202 00:15:00,948 --> 00:15:02,549 to redesign and rebuild the city. 203 00:15:03,268 --> 00:15:07,229 Hooke was the foremost experimentalist of his age. 204 00:15:07,389 --> 00:15:10,630 Using coiled springs, he derived the law of elasticity... 205 00:15:10,789 --> 00:15:13,390 known today as Hooke's law. 206 00:15:13,549 --> 00:15:17,270 He perfected the air pump, the height of technology in its time... 207 00:15:17,430 --> 00:15:21,110 and used it to experiment on respiration and sound. 208 00:15:21,270 --> 00:15:23,911 And he experimented with cannabis. 209 00:15:24,071 --> 00:15:26,231 He reported to a meeting of the Royal Society... 210 00:15:26,391 --> 00:15:30,951 that a sea captain friend of his, quote, "had so often experimented with it... 211 00:15:31,111 --> 00:15:36,432 that there is no cause of fear, though possibly there may be of laughter." 212 00:15:39,912 --> 00:15:43,992 But coffee was the drug of choice for England in the 17th century. 213 00:15:44,152 --> 00:15:46,632 Coffeehouses sprang up all over London. 214 00:15:58,313 --> 00:16:00,674 This is where people came to get news... 215 00:16:00,834 --> 00:16:03,554 to launch new ventures, and to debate ideas. 216 00:16:04,034 --> 00:16:09,315 The coffeehouse was an oasis of equality in a class-obsessed society. 217 00:16:09,794 --> 00:16:14,395 Here a poor man needn't give up his seat to a rich man, nor submit to his opinion. 218 00:16:14,555 --> 00:16:16,835 It was a kind of laboratory of democracy. 219 00:16:17,435 --> 00:16:19,395 In this highly caffeinated atmosphere... 220 00:16:20,156 --> 00:16:24,556 Halley and Hooke met Christopher Wren to discuss a deep mystery: 221 00:16:24,715 --> 00:16:27,595 Why do the planets move as they do? 222 00:16:27,756 --> 00:16:31,157 The astronomer Johannes Kepler had demonstrated some 80 years before... 223 00:16:31,677 --> 00:16:33,916 that the orbits of the planets around the sun... 224 00:16:34,076 --> 00:16:37,117 were not perfect circles, but actually ellipses... 225 00:16:37,277 --> 00:16:42,877 and that the closer a planet was to the sun, the faster it moved. 226 00:16:43,797 --> 00:16:46,517 Why? Could some invisible force from the sun 227 00:16:46,529 --> 00:16:49,078 be responsible for this change in motion? 228 00:16:49,238 --> 00:16:51,038 If so, how did it work? 229 00:16:51,198 --> 00:16:53,958 Could there be a simple mathematical law to describe it? 230 00:16:54,118 --> 00:16:57,719 Maybe something like Hooke's law of elasticity? 231 00:17:01,599 --> 00:17:02,759 Perhaps. 232 00:17:02,919 --> 00:17:06,959 But try as he might, Christopher Wren couldn't figure it out. 233 00:17:07,119 --> 00:17:09,759 Damned if I haven't tried. It's beyond me. 234 00:17:09,920 --> 00:17:13,160 I'll wager a book worth 40 shillings to the man who can solve it. 235 00:17:13,320 --> 00:17:16,680 That book is mine, Mr. Wren. I've already done the calculation. 236 00:17:16,840 --> 00:17:17,880 Halley was delighted. 237 00:17:18,040 --> 00:17:19,520 Show us, Mr. Hooke. 238 00:17:19,681 --> 00:17:22,880 But months passed, and Hooke failed to deliver. 239 00:17:23,040 --> 00:17:24,681 He couldn't do the math. 240 00:17:24,841 --> 00:17:25,921 None of them could. 241 00:17:26,081 --> 00:17:28,881 Finally Halley had enough of Hooke's excuses. 242 00:17:29,041 --> 00:17:33,601 Halley knew there must be someone, somewhere, up to the challenge. 243 00:17:40,042 --> 00:17:42,762 What about that mathematician at Cambridge? 244 00:17:42,922 --> 00:17:44,202 He was a clever fellow. 245 00:17:44,363 --> 00:17:47,803 He had solved central questions about the nature of light years before... 246 00:17:47,963 --> 00:17:49,963 when he was still only 22. 247 00:17:50,123 --> 00:17:52,523 And he invented the reflecting telescope. 248 00:17:52,683 --> 00:17:55,723 Odd bird. Dropped out of sight a while back. 249 00:17:55,884 --> 00:17:58,924 Some squabble over Hooke and his discovery about light. 250 00:17:59,083 --> 00:18:02,724 Went completely to pieces over it, has been hiding out in Cambridge ever since. 251 00:18:02,884 --> 00:18:07,324 Halley wondered if this strange and, by all accounts, exceedingly difficult man... 252 00:18:07,484 --> 00:18:10,364 might succeed where Hooke and others had failed. 253 00:18:10,525 --> 00:18:14,085 What he couldn't know, what no one could possibly imagine at the time... 254 00:18:14,245 --> 00:18:18,126 were the countless ways the world would be forever changed by this meeting... 255 00:18:18,285 --> 00:18:22,046 on an August day in 1684. 256 00:18:29,846 --> 00:18:33,967 Isaac Newton was born in England on Christmas Day in 1642. 257 00:18:35,767 --> 00:18:39,727 Before he even opened his eyes, his father was already dead. 258 00:18:41,728 --> 00:18:45,968 His mother left him when he was only 3 and did not return until he was 11. 259 00:18:47,848 --> 00:18:50,768 When she did, it was with a new family and husband... 260 00:18:50,928 --> 00:18:54,849 a stepfather who Isaac Newton despised. 261 00:18:58,729 --> 00:19:01,449 Newton's refuge from his miserable family life... 262 00:19:01,609 --> 00:19:04,929 was his passion to understand how things worked... 263 00:19:05,089 --> 00:19:08,129 especially nature itself. 264 00:19:08,290 --> 00:19:13,410 In 1661 the talented young Isaac entered Trinity College at Cambridge University... 265 00:19:13,570 --> 00:19:16,811 where he was a consistently lousy student... 266 00:19:16,971 --> 00:19:21,650 one without friends or a loving family to provide any warmth or encouragement. 267 00:19:21,810 --> 00:19:25,171 Newton mostly kept to himself, sequestered in his room... 268 00:19:25,331 --> 00:19:29,651 studying ancient Greek philosophers, geometry and languages... 269 00:19:29,811 --> 00:19:36,051 and pondering deep questions on the nature of matter, space, time and motion. 270 00:19:36,372 --> 00:19:40,293 This budding scientist was also a passionate mystic. 271 00:19:40,452 --> 00:19:43,413 Newton believed that a secret knowledge called alchemy... 272 00:19:43,573 --> 00:19:46,733 known only to a small group of ancient philosophers... 273 00:19:46,892 --> 00:19:48,493 was waiting to be rediscovered. 274 00:19:49,173 --> 00:19:53,493 He hoped to learn how to change ordinary metals into silver and gold... 275 00:19:53,653 --> 00:19:58,734 and maybe even cook up the elixir of life, the key to immortality. 276 00:19:59,934 --> 00:20:04,734 He was also obsessed with finding hidden messages in the words of the Bible. 277 00:20:06,055 --> 00:20:09,215 He combed through translations in several different languages... 278 00:20:09,374 --> 00:20:13,975 hoping to decipher coded instructions from God. 279 00:20:18,615 --> 00:20:23,056 He made elaborate calculations in an effort to discover the date of the Second Coming. 280 00:20:25,016 --> 00:20:31,017 His lifelong research in alchemy and biblical chronology never led anywhere. 281 00:20:34,657 --> 00:20:41,178 When Halley found Newton that fateful day, he was living as a virtual recluse. 282 00:20:43,618 --> 00:20:46,778 Newton had gone into hiding 13 years earlier... 283 00:20:46,938 --> 00:20:49,498 after Robert Hooke had publicly accused Newton... 284 00:20:49,658 --> 00:20:53,298 of stealing his groundbreaking work on light and color. 285 00:20:53,458 --> 00:20:57,859 In fact, it was Isaac Newton who solved the mystery of the spectrum of light... 286 00:20:58,019 --> 00:20:59,899 not Robert Hooke. 287 00:21:00,059 --> 00:21:01,900 The wound was painful and deep... 288 00:21:02,059 --> 00:21:04,419 and Newton resolved to never expose himself... 289 00:21:04,579 --> 00:21:08,020 to that kind of public humiliation ever again. 290 00:21:08,180 --> 00:21:11,780 Sir, I don't suppose you recall our meeting a few years ago? 291 00:21:11,940 --> 00:21:13,580 Yes, Mr. Halley. 292 00:21:13,740 --> 00:21:15,181 I'm sorry to bother you. 293 00:21:15,341 --> 00:21:17,781 Never mind the formalities. Get to your point. 294 00:21:17,941 --> 00:21:20,860 I've been talking with our friends Mr. Wren and Mr. Hooke. 295 00:21:21,021 --> 00:21:23,821 That scoundrel Hooke's no friend of mine. 296 00:21:23,981 --> 00:21:25,541 Yes, I understand, sir. 297 00:21:25,701 --> 00:21:30,301 But the thing is, we've been debating the puzzling question of planetary motion. 298 00:21:30,461 --> 00:21:32,684 We all agree that some force of attraction from 299 00:21:32,695 --> 00:21:34,742 the sun governs the motions of the planets. 300 00:21:34,902 --> 00:21:37,543 We suspect there must be a mathematical law... 301 00:21:37,702 --> 00:21:41,142 to describe how this force changes with distance. 302 00:21:41,302 --> 00:21:42,583 And knowing of your skill... 303 00:21:42,743 --> 00:21:46,303 Yes, yes, the attraction of gravity weakens with the square of the distance. 304 00:21:46,463 --> 00:21:48,703 That's why the planets move in ellipses. 305 00:21:48,863 --> 00:21:51,264 But, sir, how can you know this? 306 00:21:51,423 --> 00:21:54,063 Why, I have calculated it some five years ago. 307 00:21:54,224 --> 00:21:56,824 I beg you, show it to me. 308 00:21:56,984 --> 00:22:00,064 The calculation is here somewhere. 309 00:22:00,224 --> 00:22:03,544 Well, no matter. I shall redo it and be sure to send it on to you. 310 00:22:03,704 --> 00:22:08,225 This is stupendous. Why have we not had word of it before? 311 00:22:08,385 --> 00:22:11,425 Newton remembered all too well what Hooke had done to him... 312 00:22:11,585 --> 00:22:14,586 the last time he put forth an idea. 313 00:22:15,065 --> 00:22:16,985 Just when Halley may have begun to wonder... 314 00:22:17,146 --> 00:22:19,906 if Newton was bluffing, as Hooke had done earlier... 315 00:22:20,066 --> 00:22:23,386 a messenger arrived with an envelope from Newton. 316 00:22:26,627 --> 00:22:30,147 Here are the opening pages of modern science... 317 00:22:30,666 --> 00:22:32,827 with its all-embracing vision of nature... 318 00:22:33,386 --> 00:22:37,307 universal laws of motion, gravity... 319 00:22:37,467 --> 00:22:42,067 not just for the Earth but for the cosmos. 320 00:22:42,228 --> 00:22:44,148 Halley raced back to Cambridge. 321 00:22:44,308 --> 00:22:47,188 Mr. Newton, I beseech you to work all of this 322 00:22:47,348 --> 00:22:49,468 into a book as soon as possible. 323 00:22:49,628 --> 00:22:52,829 I can assure you the Royal Society will publish it. 324 00:22:52,989 --> 00:22:54,629 But there was one little problem. 325 00:22:55,509 --> 00:23:00,069 We are in agreement that Mr. Newton has produced a masterpiece. 326 00:23:00,229 --> 00:23:03,589 However, I'm afraid the Royal Society has... 327 00:23:03,749 --> 00:23:07,549 Well, regrettably, sales for the History of Fish... 328 00:23:07,710 --> 00:23:11,110 have not lived up to our financial expectations. 329 00:23:12,550 --> 00:23:13,831 It's an impressive book. 330 00:23:13,990 --> 00:23:17,830 Extremely comprehensive, really. 331 00:23:17,990 --> 00:23:23,071 It's filled with lavish illustrations of, well, fish. 332 00:23:24,351 --> 00:23:27,112 The disappointing sales led to a bigger problem. 333 00:23:27,272 --> 00:23:32,352 The Royal Society pretty much blew its total annual budget on the History of Fish. 334 00:23:32,512 --> 00:23:34,992 In fact, they were so strapped for cash... 335 00:23:35,152 --> 00:23:39,753 they had to pay poor Halley's salary with copies of their worst-selling book. 336 00:23:39,912 --> 00:23:42,633 With no money to print Newton's Principia... 337 00:23:42,792 --> 00:23:46,393 the scientific revolution hung in the balance. 338 00:23:50,793 --> 00:23:52,553 Without Halley's heroic efforts... 339 00:23:52,714 --> 00:23:57,074 the reclusive Newton's masterwork might never have seen the light of day. 340 00:23:57,234 --> 00:23:58,955 But Halley was a man on a mission... 341 00:23:59,114 --> 00:24:02,434 absolutely determined to bring Newton's genius to the world. 342 00:24:03,155 --> 00:24:07,275 That pre-scientific world, the world ruled by fear... 343 00:24:07,435 --> 00:24:10,475 was poised at the edge of a revolution. 344 00:24:10,635 --> 00:24:13,356 Everything depended on whether or not Edmond Halley... 345 00:24:13,515 --> 00:24:16,476 could get Newton's book out to the wider world. 346 00:24:16,636 --> 00:24:19,196 Halley resolved not only to edit Newton's book... 347 00:24:19,356 --> 00:24:21,996 but to publish it at his own expense. 348 00:24:22,156 --> 00:24:24,516 Newton completed the first two volumes... 349 00:24:24,676 --> 00:24:28,476 laying the mathematical framework for the physics of motion. 350 00:24:28,636 --> 00:24:32,917 The third volume would settle once and for all who won the coffeehouse wager. 351 00:24:33,077 --> 00:24:37,078 Newton applied his principles to explain all the known motions of the Earth... 352 00:24:37,237 --> 00:24:39,597 the moon and the planets. 353 00:24:39,757 --> 00:24:42,638 Unfortunately, there was this problem. 354 00:24:42,798 --> 00:24:47,118 Now Halley also took on the role of Newton's psychotherapist. 355 00:24:47,919 --> 00:24:49,839 Isaac, I'm afraid that Mr. Hooke... 356 00:24:49,998 --> 00:24:53,599 requires an acknowledgment in the preface of your third volume. 357 00:24:53,759 --> 00:24:56,999 But I have done so, thanking him, Mr. Wren and yourself... 358 00:24:57,159 --> 00:24:59,919 for prodding me to think again on astronomical matters. 359 00:25:00,079 --> 00:25:02,359 Mr. Hooke has been going about London... 360 00:25:02,519 --> 00:25:05,359 saying that you got the law of gravity from him. 361 00:25:05,520 --> 00:25:07,320 Why, that litigious little... 362 00:25:07,480 --> 00:25:11,921 Never. I would sooner burn the third volume than deface it with such a lie. 363 00:25:12,080 --> 00:25:13,320 To hell with Hooke. 364 00:25:13,480 --> 00:25:16,880 He will be long forgotten when your ideas are still being celebrated. 365 00:25:19,321 --> 00:25:22,561 More copies of that dreadful book? 366 00:25:22,721 --> 00:25:25,161 Wherever shall we put them all? 367 00:25:25,322 --> 00:25:26,921 We talked about this, Mary, dear. 368 00:25:27,082 --> 00:25:29,162 This is my salary from the Society. 369 00:25:29,322 --> 00:25:31,842 They have nothing else with which to pay me. 370 00:25:32,002 --> 00:25:36,082 If only Mr. Hooke and Mr. Newton were more like you. 371 00:25:36,242 --> 00:25:39,443 Halley and Wren decided to confront Hooke about his false claims. 372 00:25:40,082 --> 00:25:42,003 That law is mine, I tell you. 373 00:25:42,163 --> 00:25:43,363 I proved it first. 374 00:25:43,523 --> 00:25:45,363 Then fetch your proof here at once. 375 00:25:45,524 --> 00:25:49,724 Let us see it. Surely we have waited on it long enough. 376 00:25:50,123 --> 00:25:52,724 You'll simply have to take my word for it. 377 00:25:52,884 --> 00:25:57,204 Empty claims may persuade elsewhere, but not here. 378 00:25:57,364 --> 00:25:59,724 Put up or shut up, Mr. Hooke. 379 00:26:00,725 --> 00:26:03,085 Blasted Newton. I'll make him pay. 380 00:26:19,206 --> 00:26:21,006 If it wasn't for Edmond Halley... 381 00:26:21,166 --> 00:26:25,967 Newton's great book would've never been conceived, nor written, nor printed. 382 00:26:26,127 --> 00:26:30,447 Okay, but so what? What difference does that make to us? 383 00:26:30,607 --> 00:26:32,447 What's the big deal? 384 00:26:38,808 --> 00:26:44,408 When Isaac Newton was born in this house in 1642, the world was very different. 385 00:26:44,568 --> 00:26:46,570 Everyone looked at the perfection of the 386 00:26:46,581 --> 00:26:48,889 clockwork motions of the planets in the sky... 387 00:26:49,048 --> 00:26:52,689 and could only understand it as the work of a master clockmaker. 388 00:26:52,849 --> 00:26:54,289 How else to explain it? 389 00:26:54,449 --> 00:26:58,169 There was only one way such a thing could come about in their imagination. 390 00:26:58,330 --> 00:27:01,289 Only one answer for them: God. 391 00:27:01,450 --> 00:27:06,210 For reasons beyond our understanding, God just created the solar system that way. 392 00:27:06,370 --> 00:27:09,370 But this explanation is the closing of a door. 393 00:27:09,530 --> 00:27:12,250 It doesn't lead to other questions. 394 00:27:22,011 --> 00:27:26,812 Along came Newton, a God-loving man who's also a genius. 395 00:27:26,972 --> 00:27:31,092 He could write the laws of nature in perfect mathematical sentences. 396 00:27:31,252 --> 00:27:37,973 Formulas that applied universally to apples, moons, planets and so much more. 397 00:27:40,612 --> 00:27:42,973 With one foot still in the Middle Ages... 398 00:27:43,133 --> 00:27:46,173 Isaac Newton imagined the whole solar system. 399 00:27:46,334 --> 00:27:49,441 Newton's laws of gravity and motion revealed 400 00:27:49,453 --> 00:27:52,294 how the sun held distant worlds captive. 401 00:27:52,454 --> 00:27:55,454 His laws swept away the need for a master clockmaker... 402 00:27:55,614 --> 00:27:59,215 to explain the precision and beauty of the solar system. 403 00:27:59,375 --> 00:28:01,815 Gravity is the clockmaker. 404 00:28:02,574 --> 00:28:05,215 Matter obeyed commandments we could discover... 405 00:28:05,375 --> 00:28:07,735 laws the Bible hadn't mentioned. 406 00:28:07,896 --> 00:28:11,056 Newton's answer to why the solar system is the way it is... 407 00:28:11,215 --> 00:28:13,856 opened the way to an infinite number of questions. 408 00:28:14,375 --> 00:28:17,856 Principia also happened to include the invention of calculus... 409 00:28:18,016 --> 00:28:23,097 and the first sound theoretical basis for an end to our imprisonment on Earth: 410 00:28:23,257 --> 00:28:24,816 space travel. 411 00:28:28,417 --> 00:28:32,217 Newton envisioned the firing of a Cannonball... 412 00:28:32,377 --> 00:28:36,138 with increasingly greater explosive thrust. 413 00:28:37,858 --> 00:28:40,258 He reasoned that with enough velocity... 414 00:28:40,418 --> 00:28:43,018 the bounds of gravity could be broken... 415 00:28:43,178 --> 00:28:47,059 and the cannonball could escape to orbit the Earth. 416 00:28:47,219 --> 00:28:49,979 This changed everything. 417 00:29:49,384 --> 00:29:53,544 Newton's Principia Mathematica set us free in another way. 418 00:29:53,704 --> 00:29:57,944 By finding the natural laws governing the comings and goings of comets... 419 00:29:58,105 --> 00:30:00,425 he decoupled the motions of the heavens... 420 00:30:00,585 --> 00:30:04,905 from their ancient connections to our fears. 421 00:30:09,705 --> 00:30:13,066 If Halley hadn't been standing next to Newton for all those years... 422 00:30:13,226 --> 00:30:15,106 perhaps the world would remember him... 423 00:30:15,266 --> 00:30:17,866 for his own host of accomplishments and discoveries. 424 00:30:18,026 --> 00:30:22,066 But the only thing that comes to mind for most people is the comet. 425 00:30:22,226 --> 00:30:25,066 The irony is that discovering a comet... 426 00:30:25,227 --> 00:30:28,907 is actually one of the few things that Halley never did. 427 00:30:33,747 --> 00:30:35,627 Mountain of ice to starboard. 428 00:30:35,787 --> 00:30:38,028 Come about. Come about! 429 00:30:38,188 --> 00:30:40,588 Aye, aye, Captain Halley! 430 00:30:40,748 --> 00:30:42,828 After the publication of the Principia... 431 00:30:43,308 --> 00:30:46,748 Halley was commanded by his king to lead three ocean voyages... 432 00:30:47,229 --> 00:30:51,469 scientific expeditions to solve navigational problems for the British navy. 433 00:30:51,629 --> 00:30:56,909 Halley used this opportunity to make the first map of the Earth's magnetic field. 434 00:31:00,670 --> 00:31:03,310 And he was also a businessman. 435 00:31:05,830 --> 00:31:08,751 Halley perfected the diving bell... 436 00:31:09,871 --> 00:31:14,191 and used his invention to start a flourishing commercial salvage operation. 437 00:31:18,631 --> 00:31:20,872 Hmm. Our Dr. Halley's gone and done it this time. 438 00:31:21,031 --> 00:31:23,792 I reckon he's been down there at least three hours. 439 00:31:23,952 --> 00:31:30,512 Not one to risk the lives of others, Halley personally tested his own invention. 440 00:31:33,672 --> 00:31:36,713 I make it exactly four hours since our descent. 441 00:31:36,873 --> 00:31:38,593 Not at all bad for 10 fathoms. 442 00:31:43,754 --> 00:31:46,794 He invented the weather map. 443 00:31:48,234 --> 00:31:53,474 And the symbols he devised for indicating prevailing winds are still in use today. 444 00:32:04,196 --> 00:32:07,955 Halley laid the groundwork for the science of population statistics. 445 00:32:08,115 --> 00:32:09,076 How? 446 00:32:09,236 --> 00:32:14,756 He compared the birth, marriage, death and population densities of London and Paris. 447 00:32:14,917 --> 00:32:18,116 He actually had to pace off the entire perimeter of Paris on foot... 448 00:32:18,276 --> 00:32:20,077 to learn its true dimensions. 449 00:32:20,237 --> 00:32:23,277 He came to the conclusion that since roughly half of all adults... 450 00:32:23,436 --> 00:32:26,597 fail to reproduce children, who themselves survive to reproduce... 451 00:32:27,277 --> 00:32:30,273 every married couple must have four children 452 00:32:30,285 --> 00:32:32,757 in order to maintain the population. 453 00:32:35,038 --> 00:32:38,758 And it was Edmond Halley who gave us the actual scale of the solar system. 454 00:32:38,919 --> 00:32:42,398 He figured out a clever way to find the distance from Earth to the sun. 455 00:32:42,558 --> 00:32:45,807 It involved precisely measuring the time it took 456 00:32:45,819 --> 00:32:48,879 for the planet Venus to cross the sun's disc. 457 00:32:51,159 --> 00:32:53,359 Twenty-seven years after Halley's death... 458 00:32:53,519 --> 00:32:56,320 Captain James Cook made his first voyage to Tahiti... 459 00:32:56,479 --> 00:32:59,160 for the express purpose of testing Halley's method... 460 00:32:59,320 --> 00:33:02,000 during a transit of Venus across the sun. 461 00:33:02,160 --> 00:33:04,281 Using a special filter to protect his vision... 462 00:33:04,440 --> 00:33:06,960 from being destroyed by looking directly at the sun... 463 00:33:07,121 --> 00:33:09,481 Cook and his men made it possible for us to know... 464 00:33:09,641 --> 00:33:13,801 that the sun is 93 million miles from Earth. 465 00:33:14,481 --> 00:33:17,210 And Halley was the first to realize that the 466 00:33:17,221 --> 00:33:19,961 so-called fixed stars were not fixed at all. 467 00:33:20,602 --> 00:33:21,721 How'd he do it'? 468 00:33:21,882 --> 00:33:23,361 He pored over the observations... 469 00:33:23,522 --> 00:33:26,682 made by the ancient Greek astronomers of the brightest stars. 470 00:33:26,842 --> 00:33:28,522 And he compared their observations... 471 00:33:28,683 --> 00:33:33,242 with the ones he himself made of the same stars 1800 years later. 472 00:33:33,403 --> 00:33:35,803 Why hadn't anyone noticed this before? 473 00:33:35,963 --> 00:33:38,483 Halley figured out that it would only become apparent... 474 00:33:38,643 --> 00:33:41,724 if you waited long enough between observations. 475 00:33:41,883 --> 00:33:45,004 It's hard to perceive the motions of things that are far away. 476 00:33:45,164 --> 00:33:47,396 And the stars are so very far away that you 477 00:33:47,408 --> 00:33:49,804 would need to track them for many centuries... 478 00:33:49,965 --> 00:33:53,485 before you could detect that they moved at all. 479 00:33:55,044 --> 00:33:58,965 Halley discovered the first clue to a magnificent reality: 480 00:33:59,125 --> 00:34:02,405 All the stars are in motion, streaming past each other... 481 00:34:02,566 --> 00:34:05,085 rising and falling like merry-go-round horses... 482 00:34:05,245 --> 00:34:09,846 in their Newtonian dance around the center of our galaxy. 483 00:34:10,806 --> 00:34:14,846 And, oh, yes, there was that thing about the comet. 484 00:34:19,287 --> 00:34:21,887 What were those strange and beautiful celestial visitors... 485 00:34:22,047 --> 00:34:24,607 that appeared without warning from time to time? 486 00:34:24,767 --> 00:34:27,808 Halley set out to solve this mystery as a detective would... 487 00:34:27,967 --> 00:34:30,447 by gathering all credible eyewitness testimony. 488 00:34:30,607 --> 00:34:34,208 The earliest precise observations of a comet that Halley could find... 489 00:34:34,368 --> 00:34:37,809 were made in Constantinople by Nicephorus Gregoras... 490 00:34:37,969 --> 00:34:42,009 a Byzantine astronomer and monk, in June 1337. 491 00:34:42,169 --> 00:34:45,809 Halley hunted down every astronomical observation of a comet... 492 00:34:45,969 --> 00:34:51,410 recorded in Europe between 1472 and 1698. 493 00:34:51,569 --> 00:34:55,490 And remember, there was no such thing as a search engine or a computer. 494 00:34:55,650 --> 00:34:59,010 All Halley had were his books and his mind. 495 00:34:59,170 --> 00:35:00,451 Now here comes the hard part: 496 00:35:00,610 --> 00:35:03,571 Halley had to take the observations made for each comet... 497 00:35:03,731 --> 00:35:07,011 and find the shape of its actual path through space. 498 00:35:07,171 --> 00:35:09,171 No one else but Newton had yet attempted... 499 00:35:09,331 --> 00:35:12,411 to apply his new set of laws to an astronomical question. 500 00:35:12,571 --> 00:35:15,772 In an arduous tour de force of mathematical brilliance... 501 00:35:15,932 --> 00:35:22,212 Halley discovered that comets were bound to the sun in long elliptical orbits. 502 00:35:26,132 --> 00:35:30,132 And he was the first to know that the comets seen in 1531 503 00:35:31,173 --> 00:35:35,813 1607, and 1682... 504 00:35:35,974 --> 00:35:37,533 were one and the same. 505 00:35:37,693 --> 00:35:40,774 A single comet that returned every 76 years. 506 00:35:40,933 --> 00:35:44,294 In a stunning example of true pattern recognition... 507 00:35:44,454 --> 00:35:48,414 he predicted it would be seen again more than 50 years in the future. 508 00:35:50,694 --> 00:35:53,655 For millennia, comets had been props for mystics... 509 00:35:53,815 --> 00:35:57,775 who considered them to be merely omens of human events. 510 00:35:57,935 --> 00:36:02,095 Halley shattered their monopoly, beating them at their own game. 511 00:36:02,255 --> 00:36:05,576 A game that no scientist had ever played before: 512 00:36:05,736 --> 00:36:07,736 prophecy. 513 00:36:07,896 --> 00:36:09,576 And he did not hedge his bet. 514 00:36:09,736 --> 00:36:13,257 Like Babe Ruth predicting where his next home run would land in the stands... 515 00:36:13,417 --> 00:36:18,297 Halley stated flatly that the comet would return at the end of 1758... 516 00:36:18,457 --> 00:36:23,298 from a particular part of the sky, following a specific path. 517 00:36:23,457 --> 00:36:25,857 There is hardly a prophecy attempted by the mystics... 518 00:36:26,018 --> 00:36:29,938 that ever even strives for comparable precision. 519 00:36:49,740 --> 00:36:51,780 That's Halley's Cornet. 520 00:36:51,940 --> 00:36:54,940 Out here at the edge of the solar system, it doesn't look like much. 521 00:36:55,100 --> 00:36:58,180 Just a big hunk of ice and rock in space. 522 00:36:58,340 --> 00:37:02,741 That's because beyond the orbit of Neptune, nearly 5 billion kilometers from the sun... 523 00:37:02,901 --> 00:37:04,900 comets lead very quiet lives. 524 00:37:07,621 --> 00:37:09,662 As it reaches the far end of its orbit... 525 00:37:09,821 --> 00:37:13,261 it'll slow down till the sun allows it to go no farther. 526 00:37:13,421 --> 00:37:18,062 Then it'll begin its long fall back to the inner solar system. 527 00:37:18,422 --> 00:37:21,422 Halley's Comet is in free fall around the sun. 528 00:37:21,582 --> 00:37:23,062 Everything in our solar system... 529 00:37:23,223 --> 00:37:26,542 the Earth, the moon, the other planets, comets, asteroids... 530 00:37:26,702 --> 00:37:29,583 all of them are falling around the sun. 531 00:37:29,743 --> 00:37:34,303 Gravity pulls the planets towards the sun, but because of their orbital momentum... 532 00:37:34,463 --> 00:37:39,144 they keep moving around the sun, never falling into it. 533 00:37:42,624 --> 00:37:46,864 "Robert Hooke had died years before, having ruined his health with some bad habits." 534 00:37:47,024 --> 00:37:50,905 daily doses of Wormwood, opium, mercury. 535 00:37:51,065 --> 00:37:53,337 A few months later, Newton was elected to 536 00:37:53,349 --> 00:37:55,905 replace him as president of the Royal Society. 537 00:37:56,065 --> 00:38:01,346 It is said that a portrait of Hooke once hung on these walls. 538 00:38:01,506 --> 00:38:05,386 Halley lived on to accomplish many more astonishing feats. 539 00:38:05,546 --> 00:38:09,587 He worked right up to his death at age 85. 540 00:38:10,226 --> 00:38:13,746 His final act was to call for a glass of wine. 541 00:38:13,906 --> 00:38:18,027 He downed it with pleasure and breathed his last breath. 542 00:38:22,867 --> 00:38:26,548 Some believe that it was on a night like this... 543 00:38:26,708 --> 00:38:31,188 that Isaac Newton finally took his revenge against Robert Hooke. 544 00:38:38,828 --> 00:38:39,829 Heh. 545 00:38:45,469 --> 00:38:47,990 But Halley's prophecy was not forgotten. 546 00:38:48,149 --> 00:38:51,670 Fifty years later, as the time of the predicted return approached... 547 00:38:51,830 --> 00:38:56,110 the world's astronomers vied to be the first to catch sight of his comet. 548 00:38:56,270 --> 00:38:57,991 They weren't disappointed. 549 00:38:58,151 --> 00:39:01,750 It's been welcomed back every 76 years since. 550 00:39:02,710 --> 00:39:05,089 When Halley's Comet returns to our skies, 551 00:39:05,101 --> 00:39:07,831 sunlight will warm up the ice on its surface... 552 00:39:07,991 --> 00:39:13,951 once again setting loose the dust and gases trapped within. 553 00:39:15,432 --> 00:39:20,512 Halley's Comet most recently visited our neighborhood back in 1986. 554 00:39:20,672 --> 00:39:26,633 And if you're seeing this in 2061, then you'll know it's back. 555 00:39:27,993 --> 00:39:32,113 May you feel the wonder of all those who came before you... 556 00:39:32,273 --> 00:39:34,033 and none of the fear. 557 00:39:34,874 --> 00:39:37,354 Newton's laws made it possible for Edmond Halley... 558 00:39:37,514 --> 00:39:43,034 to see some 50 years into the future and predict the behavior of a single comet. 559 00:39:43,674 --> 00:39:46,675 Scientists have been using these laws ever since... 560 00:39:46,835 --> 00:39:51,355 opening the way to the moon, and even beyond our solar system. 561 00:39:51,514 --> 00:39:55,675 The baby in the basket is learning to walk... 562 00:40:00,475 --> 00:40:03,276 and to know the cosmos. 563 00:40:07,356 --> 00:40:10,316 Which brings me to one last prophecy. 564 00:40:10,476 --> 00:40:13,476 Using nothing more than Newton's laws of gravitation... 565 00:40:13,637 --> 00:40:17,957 we astronomers can confidently predict that several billion years from now... 566 00:40:18,117 --> 00:40:20,637 our home galaxy, the Milky Way... 567 00:40:20,797 --> 00:40:25,318 will merge with our neighboring galaxy Andromeda. 568 00:40:25,918 --> 00:40:30,238 Because the distances between the stars are so great compared to their sizes... 569 00:40:30,398 --> 00:40:34,559 few if any stars in either galaxy will actually collide. 570 00:40:34,718 --> 00:40:38,438 Any life on the worlds of that far-off future should be safe... 571 00:40:38,599 --> 00:40:43,519 but they would be treated to an amazing, billion-year-long light show... 572 00:40:44,759 --> 00:40:48,680 a dance of a half a trillion stars... 573 00:40:49,040 --> 00:40:52,320 to music first heard on one little world... 574 00:40:52,480 --> 00:40:56,400 by a man who had but one true friend. 51718

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