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These are the user uploaded subtitles that are being translated: 1 00:00:03,554 --> 00:00:10,993 CHRIS: From on board the spaceship, you can see the world has a secret. 2 00:00:11,028 --> 00:00:15,698 At dawn or at dusk, where the shadows are lining up just the right way, 3 00:00:15,733 --> 00:00:22,971 you're at just the right place in time to see an asteroid crater. 4 00:00:23,007 --> 00:00:30,312 Where a bullet from the universe left a perpetual hole in the smooth surface of our planet. 5 00:00:30,347 --> 00:00:34,383 There are a billion years worth of impacts. 6 00:00:34,418 --> 00:00:42,024 Huge asteroids have smashed into the world, and turned it into an enveloped fire. 7 00:00:42,059 --> 00:00:45,160 Uninhabitable to almost all life on the surface. 8 00:00:50,000 --> 00:00:55,304 The world will get hit again. 9 00:00:55,339 --> 00:00:57,039 It's just a matter of when. 10 00:00:57,975 --> 00:01:02,845 So, what should we do as a species? 11 00:01:02,880 --> 00:01:08,217 Should we just, like the dinosaurs, look up and die? 12 00:01:10,821 --> 00:01:15,457 The reasons the dinosaurs are extinct is they didn't have a space program. 13 00:01:15,493 --> 00:01:18,026 We do. 14 00:01:18,062 --> 00:01:21,997 We have the capability to perhaps escape the Earth. 15 00:01:26,237 --> 00:01:29,538 NARRATOR: Escaping Earth? 16 00:01:29,573 --> 00:01:33,342 Leaving home is hard at the best of time. 17 00:01:33,377 --> 00:01:38,313 Imagine how hard it would be if you were never coming back. 18 00:01:38,349 --> 00:01:42,985 Not just back to your home town, but your home planet. 19 00:01:43,020 --> 00:01:49,324 WILL: A one-way ticket away from everywhere, everything and everyone you know and need. 20 00:01:54,865 --> 00:01:59,434 NARRATOR: 8 astronauts with over 1,000 days in space between then, 21 00:01:59,470 --> 00:02:03,272 can tell us how being up there helped them to understand 22 00:02:03,307 --> 00:02:06,975 why we are going to have to make a choice. 23 00:02:07,011 --> 00:02:10,946 MIKE: Faced with extinction of life on Earth. 24 00:02:10,981 --> 00:02:17,352 Our best chance of survival is to build another colony somewhere else. 25 00:02:17,388 --> 00:02:21,423 LELAND: Having a base on Mars, a base on the moon or in other places, 26 00:02:21,458 --> 00:02:24,726 is important to keep our civilization going. 27 00:02:26,564 --> 00:02:30,732 CHRIS: It's really kinda up to us how long we wanna survive as a species. 28 00:02:33,070 --> 00:02:37,706 NARRATOR: Can we really cut the cord with the planet that made us? 29 00:02:37,741 --> 00:02:42,144 And face the physical extremes and mental torment of space? 30 00:02:43,914 --> 00:02:46,248 WILL: Theanswers are right here on earth. 31 00:02:46,283 --> 00:02:49,151 In some pretty unexpected places. 32 00:02:53,157 --> 00:02:57,459 NARRATOR: Like multi-million-year-old blood. 33 00:02:57,494 --> 00:03:00,662 Mutant bugs. 34 00:03:00,698 --> 00:03:03,932 And humans that had left the land behind. 35 00:03:06,837 --> 00:03:11,073 CHRIS: It is not going to be easy to get ourselves safely away from the Earth 36 00:03:11,108 --> 00:03:15,110 and onto another planet. 37 00:03:15,145 --> 00:03:19,248 People will die. 38 00:03:19,283 --> 00:03:21,950 This maybe what saves us. 39 00:03:25,656 --> 00:03:28,090 WILL: It's decision time on The Rock. 40 00:03:28,125 --> 00:03:30,292 Escape or extinction? 41 00:03:46,577 --> 00:03:50,245 NARRATOR: Earth's been through some big changes. 42 00:03:50,281 --> 00:03:53,482 Ice ages have come and gone... 43 00:03:53,517 --> 00:03:58,353 Volcanoes have blanketed the world in ash. 44 00:03:58,389 --> 00:04:02,291 And all of this could happen again. 45 00:04:02,326 --> 00:04:05,327 In fact, sooner or later, it's going to. 46 00:04:06,830 --> 00:04:13,135 So, if we knew a huge asteroid was bearing down... 47 00:04:13,170 --> 00:04:17,572 Or a giant eruption was about to suffocate the planet... 48 00:04:20,778 --> 00:04:26,114 We'd feel a lot better if we had a Plan B. 49 00:04:26,150 --> 00:04:31,720 CHRIS: To put a human base on another planet, it will involve risk. 50 00:04:31,755 --> 00:04:37,526 It pushes our technology right to the very edge of our capability. 51 00:04:37,561 --> 00:04:40,128 But the benefit is for the whole species. 52 00:04:56,814 --> 00:05:00,482 CAPT. BOWEN: So today, what we're going out there to do is intercept the eclipse. 53 00:05:00,517 --> 00:05:03,352 Really experience the full eclipse since it happens so rarely. 54 00:05:03,387 --> 00:05:04,886 Fly and chase the moon. 55 00:05:04,922 --> 00:05:07,389 You can't do it every day. 56 00:05:07,424 --> 00:05:11,526 At 15 is rated almost up to mach 2.5. 57 00:05:11,562 --> 00:05:16,665 So, our goal is approximately three minutes of time in the shadow. 58 00:05:16,700 --> 00:05:18,800 NARRATOR: Alright, let me break that down. 59 00:05:18,836 --> 00:05:24,906 Luckily, my dad was in the Air Force, so I can do this. 60 00:05:24,942 --> 00:05:30,979 These guys are going to try something they've never done before. 61 00:05:31,015 --> 00:05:35,484 Something that shows how hard it is to go from 1 planet to another. 62 00:05:40,090 --> 00:05:45,160 Everything in our galaxy is moving. 63 00:05:45,195 --> 00:05:50,298 During an eclipse, when the moon slides across the sun... 64 00:05:50,334 --> 00:05:58,006 Its shadow speeds over the air at 1700 miles per hour. 65 00:05:58,042 --> 00:06:02,944 But it's easy to forget that we're moving too. 66 00:06:02,980 --> 00:06:09,384 Our planet spins at 1,000 miles per hour. 67 00:06:09,420 --> 00:06:14,489 To stay in the moon's shadow, the planes have to fly faster than earth spins. 68 00:06:20,664 --> 00:06:23,765 CAPT. BOWEN: 3 3 units, mark ready, ready now. 69 00:06:31,175 --> 00:06:33,742 This is definitely the ultimate intercept. 70 00:06:33,777 --> 00:06:37,079 Chasing the fastest object that we could chase. 71 00:06:37,114 --> 00:06:39,815 If we can do this, we can intercept anything. 72 00:06:42,486 --> 00:06:46,288 Keep it tight, the eclipse is coming. 73 00:06:46,323 --> 00:06:48,990 PILOT: Here comes the shadow out in front of us now. 74 00:06:49,026 --> 00:06:52,694 CAPT. BOWEN: Alright stand by for. 75 00:06:52,729 --> 00:06:54,029 OK. 76 00:06:56,333 --> 00:06:57,365 PILOT: That's pretty cool. 77 00:07:00,671 --> 00:07:02,404 CAPT. BOWEN: 20 seconds. 78 00:07:10,547 --> 00:07:12,481 It's almost like you're in outer space. 79 00:07:20,557 --> 00:07:22,023 As a kid, you know, you always think about astronauts and travelling 80 00:07:22,059 --> 00:07:26,394 to space and circling the moon. 81 00:07:26,430 --> 00:07:28,330 But I never thought of how fast the moon was travelling. 82 00:07:34,705 --> 00:07:36,938 OK 5:30 into the eclipse. 83 00:07:41,278 --> 00:07:42,777 Here comes the daylight. 84 00:07:47,117 --> 00:07:48,783 And it's daytime. 85 00:07:52,723 --> 00:07:56,091 CHRIS: If you're in an aeroplane and trying to chase that shadow, 86 00:07:56,126 --> 00:08:03,398 that's really just a little hint of how hard it is to launch a rocket ship and go intercept 87 00:08:03,433 --> 00:08:08,270 the moon or go all the way out to Mars where everything is moving. 88 00:08:08,305 --> 00:08:10,438 And the Earth isn't just rotating. 89 00:08:10,474 --> 00:08:14,576 It's moving through space at almost 70,000 miles an hour. 90 00:08:14,611 --> 00:08:19,214 While Mars is moving at over 50,000 miles an hour. 91 00:08:19,249 --> 00:08:26,121 It's like grabbing a gun and trying to hit a bullet with a bullet. 92 00:08:26,156 --> 00:08:30,192 We've sent probes to Mars and to Jupiter and to Saturn. 93 00:08:30,227 --> 00:08:32,360 But probes are machines. 94 00:08:32,396 --> 00:08:34,462 Getting people there? 95 00:08:34,498 --> 00:08:37,566 That's a whole other level of difficult. 96 00:08:43,307 --> 00:08:47,442 So before we make that commitment and fire those engines, 97 00:08:47,477 --> 00:08:52,781 we really wanna be sure we know what we're doing. 98 00:08:52,816 --> 00:08:58,119 The natural human reaction to the unknown is fear. 99 00:08:58,155 --> 00:09:03,725 But the greatest antidote for fear is preparation. 100 00:09:03,760 --> 00:09:08,029 Part of the reason I love flight is how it makes me feel. 101 00:09:08,065 --> 00:09:12,133 It pushes me a little bit closer to the limit of my capabilities. 102 00:09:12,169 --> 00:09:14,469 Especially when you're flying an older plane. 103 00:09:14,504 --> 00:09:16,438 Just barely give it a couple of these. 104 00:09:20,210 --> 00:09:23,478 You have to focus, you have to constantly thing about what are the things that are gonna try 105 00:09:23,513 --> 00:09:27,315 and kill me. 106 00:09:27,351 --> 00:09:31,453 Try and predict what the dangers are going to be. 107 00:09:31,488 --> 00:09:33,588 And then try and get ready for those. 108 00:09:35,225 --> 00:09:36,224 Pull her out. 109 00:09:36,260 --> 00:09:38,026 Yeah. 110 00:09:38,061 --> 00:09:38,760 Here we go. 111 00:09:44,534 --> 00:09:47,502 Permanently leaving the earth. 112 00:09:47,537 --> 00:09:51,206 Turning our tail to the planet and firing the engines to go somewhere else, 113 00:09:51,241 --> 00:09:54,075 that is still right on the edge of impossible. 114 00:09:58,849 --> 00:10:04,452 But in 1902, flying was impossible. 115 00:10:04,488 --> 00:10:07,555 But after the Wright Brothers, it was something we knew how to do. 116 00:10:11,128 --> 00:10:14,562 Summer of '69, impossible to walk on the moon. 117 00:10:14,598 --> 00:10:22,370 And then 12 people put their grey, dusty footprints into the surface of the moon. 118 00:10:22,406 --> 00:10:29,110 So I think we'll go from a space station to the moon and eventually onto Mars. 119 00:10:29,146 --> 00:10:32,781 Because it's a necessary thing for the survival of our species. 120 00:10:35,085 --> 00:10:37,986 NARRATOR: They call it a Goldilocks planet. 121 00:10:38,021 --> 00:10:41,289 A world that's not too hot and not too cold. 122 00:10:41,325 --> 00:10:43,191 Just like Earth. 123 00:10:43,226 --> 00:10:46,328 WILL: Until we find it, we're looking at the next best thing. 124 00:10:46,363 --> 00:10:49,431 Life on Mars. 125 00:10:49,466 --> 00:10:55,136 But even if we have the technology to leave our home, do we have the biology? 126 00:11:05,582 --> 00:11:07,716 NARRATOR: Nothing good lasts forever. 127 00:11:07,751 --> 00:11:11,286 Earth is no different. 128 00:11:11,321 --> 00:11:15,657 WILL: If we want to outlast our home, we need to franchise. 129 00:11:15,693 --> 00:11:18,560 Set up an outlet on another planet. 130 00:11:21,098 --> 00:11:25,567 NARRATOR: When we leave earth, we leave behind more than a rock. 131 00:11:25,602 --> 00:11:28,670 Earth is a living planet. 132 00:11:28,706 --> 00:11:32,607 An interconnected web of life. 133 00:11:32,643 --> 00:11:37,279 We are part of it and it is part of us. 134 00:11:37,314 --> 00:11:41,249 WILL: So when we go, what comes and what stays. 135 00:11:44,855 --> 00:11:48,457 CHRIS: One of the final stages of preparation for my third space flight 136 00:11:48,492 --> 00:11:54,496 to fly a Russian spaceship, was wiping my entire body with rubbing alcohol. 137 00:11:54,531 --> 00:11:58,133 To try and get rid of as many bacteria as possible. 138 00:12:01,472 --> 00:12:07,275 You don't want the spaceship to become unhealthy for the people living there. 139 00:12:07,311 --> 00:12:12,214 But bacteria have been colonizing the planet for billions of years. 140 00:12:12,249 --> 00:12:15,117 And they're pretty good at getting everywhere. 141 00:12:24,361 --> 00:12:29,664 To spot them we have to use something else that's survived for a long time. 142 00:12:36,507 --> 00:12:44,346 Horseshoe crabs were alive 200 Million years before the dinosaurs. 143 00:12:44,381 --> 00:12:48,683 And yet, they've turned out to be surprisingly useful in space. 144 00:12:52,990 --> 00:12:58,827 Their immune system is primitive but effective. 145 00:12:58,862 --> 00:13:02,931 So we make use of their incredible blue blood. 146 00:13:07,504 --> 00:13:15,777 When cells in their blood come into contact with bacteria, they instantly release enzymes. 147 00:13:15,813 --> 00:13:23,685 And these enzymes can be used to detect bacteria at less than one part per trillion. 148 00:13:23,720 --> 00:13:29,524 That's like detecting one grain of sugar in an Olympic size swimming pool. 149 00:13:29,560 --> 00:13:36,498 So we can use a tiny spec of horseshoe crab blood to spot contamination. 150 00:13:38,669 --> 00:13:43,104 It's easy to think of the bacteria on my body as some foreign matter that I would like 151 00:13:43,140 --> 00:13:45,340 to get rid of. 152 00:13:45,375 --> 00:13:52,480 But if you look at us under a microscope, we're crawling with life. 153 00:13:52,516 --> 00:13:59,387 There are more bacterial cells in our body than there are human cells. 154 00:13:59,423 --> 00:14:03,091 An entire universe inside me. 155 00:14:08,866 --> 00:14:15,403 The more we study the human microbiome, all of the little microbes that live within us, 156 00:14:15,439 --> 00:14:19,741 and especially when we start thinking about leaving earth, the more we realize, 157 00:14:19,776 --> 00:14:24,079 the bacteria aren't stowaways, they're crew. 158 00:14:24,114 --> 00:14:28,149 And we're going to have to bring some of them with us, when we go to another planet. 159 00:14:28,185 --> 00:14:40,996 (music) 160 00:14:41,031 --> 00:14:42,797 DR. KERR: How far are they, ahead, do you think? 161 00:14:42,833 --> 00:14:47,469 MALE CREW: I would say absolute minimum of two, probably at least three miles. 162 00:14:53,110 --> 00:14:58,446 NARRATOR: We are searching for the world's biggest creature. 163 00:14:58,482 --> 00:15:00,015 The blue whale. 164 00:15:02,185 --> 00:15:08,990 Most species on the planet are totally dependant on their microbiomes to survive. 165 00:15:09,026 --> 00:15:13,428 It's amazing how similar whales and humans are. 166 00:15:13,463 --> 00:15:18,133 Even though we walk on the land and they swim in the abyss, 167 00:15:18,168 --> 00:15:21,603 the same biological mechanisms are in play here. 168 00:15:25,943 --> 00:15:31,479 The reality is, it's very difficult to collect data on whales. 169 00:15:31,515 --> 00:15:35,717 Imagine if an elephant disappeared under the Serengeti and came up five miles away. 170 00:15:37,955 --> 00:15:41,356 MALE CREW: Whale's right over here at ten o'clock. 171 00:15:41,391 --> 00:15:46,928 NARRATOR: Every time a whale exhales, it's throwing up this biological treasure trove. 172 00:15:46,964 --> 00:15:48,697 DR. KERR: Starting engines, clear. 173 00:15:48,732 --> 00:15:54,302 NARRATOR: So how can you collect biological data in a non-invasive manner? 174 00:15:54,338 --> 00:15:56,871 The answer is, snot bot. 175 00:16:00,210 --> 00:16:02,844 DRONE OPERATOR: 30 plus feet, you're just going off for visual? 176 00:16:02,879 --> 00:16:04,212 MALE CREW: Yeah, you're in good shape. 177 00:16:04,247 --> 00:16:08,850 DR. KERR: And I see the whale now. DRONE OPERATOR: OK. 178 00:16:08,885 --> 00:16:12,220 You're right to 16 feet, 16. 179 00:16:12,255 --> 00:16:13,688 14. 180 00:16:13,724 --> 00:16:21,029 (music) 181 00:16:21,064 --> 00:16:24,099 DR. KERR: Alright. She's dived. No words, lovely dive. 182 00:16:26,903 --> 00:16:32,474 Might not have liked that head on approach, but there's no way to know. 183 00:16:32,509 --> 00:16:39,381 As excited as we are with this tool, you've gotta be at the right place at the right time. 184 00:16:39,416 --> 00:16:41,983 OK, so the whale's been doing 9-minute dives. 185 00:16:42,019 --> 00:16:46,588 Let's launch the drone at 8 minutes and then we're ready when it comes up. 186 00:16:46,623 --> 00:16:48,456 Hopefully we'll get the second blow. 187 00:16:56,400 --> 00:16:59,701 DRONE OPERATOR: Looking good, right on track. That's 14 feet. 188 00:16:59,736 --> 00:17:04,139 DR. KERR: They're exchanging a lung full of air, probably bigger than a VW 189 00:17:04,174 --> 00:17:06,808 in one or two seconds. 190 00:17:06,843 --> 00:17:08,643 It's incredible. 191 00:17:10,147 --> 00:17:11,679 DRONE OPERATOR: Staying with it. DR. KERR: What's my height? 192 00:17:11,715 --> 00:17:12,914 DRONE OPERATOR: You're at 14. 193 00:17:15,585 --> 00:17:18,286 DR. KERR: Whale's looking really calm. 194 00:17:18,321 --> 00:17:20,488 Moving very slowly. 195 00:17:33,336 --> 00:17:34,302 Bingo. 196 00:17:42,746 --> 00:17:44,512 Good job team, good job. 197 00:17:48,085 --> 00:17:50,652 Alright, you guys ready for landing, bring her in. 198 00:17:53,757 --> 00:17:56,357 And this is gonna be a snotty dish. 199 00:17:58,161 --> 00:18:01,963 We know bacteria in the stomach of whales is necessary for digestion, 200 00:18:01,998 --> 00:18:07,168 but we're starting to see that the microbiome in the lungs plays a key role 201 00:18:07,204 --> 00:18:11,339 in fighting infection. Just like it does in humans. 202 00:18:11,374 --> 00:18:17,946 (music) 203 00:18:17,981 --> 00:18:23,451 NARRATOR: There's a world of bacteria outside us and a world of bacteria inside us. 204 00:18:29,126 --> 00:18:33,661 WILL: And nobody knows what will happen when those two worlds are pulled apart. 205 00:18:36,066 --> 00:18:40,001 But we know one thing that we can't take with us. 206 00:18:40,036 --> 00:18:41,836 And it's something that keep us all grounded. 207 00:18:41,872 --> 00:18:51,913 (music) 208 00:18:51,915 --> 00:19:05,894 (music) 209 00:19:05,929 --> 00:19:13,835 JONATHAN: The feeling in the platform is full of emotion, is fear, pressure, tension. 210 00:19:35,091 --> 00:19:37,792 It's something that you love to do. 211 00:19:37,827 --> 00:19:41,062 Even when you know that you can kill yourself. 212 00:19:41,097 --> 00:19:48,570 (music) 213 00:19:48,605 --> 00:19:52,907 You have only 2.9 seconds. Anything can go wrong. 214 00:19:54,611 --> 00:19:59,347 If you did a mistake in the air... 215 00:19:59,382 --> 00:20:01,416 That's it, it's over. 216 00:20:01,451 --> 00:20:16,297 (music) 217 00:20:16,333 --> 00:20:21,469 CHRIS: We are all intimately familiar with gravity. 218 00:20:21,504 --> 00:20:26,474 The huge mass of the world pulls us down. 219 00:20:26,509 --> 00:20:30,945 We call it 1 G, that's how the world pulls on us. 220 00:20:30,981 --> 00:20:34,649 But we're the only species that has found a way to cheat that. 221 00:20:39,356 --> 00:20:45,793 Perhaps the most magic moment in an astronaut's life is when the rocket ship has done its job. 222 00:20:48,164 --> 00:20:53,601 You are at the right height, you're at the right speed, the engine's shut off. 223 00:20:53,637 --> 00:20:58,172 You're in space and for the first time in your life, you're weightless. 224 00:21:01,511 --> 00:21:07,782 You feel like something is magically pulling you towards the ceiling. 225 00:21:07,817 --> 00:21:12,287 It's just fun to be weightless. And leaves a smile on your face. 226 00:21:12,322 --> 00:21:14,022 You wanna play with it. 227 00:21:14,057 --> 00:21:17,158 You wanna play with your food, you wanna do a thousand somersaults. 228 00:21:17,193 --> 00:21:20,728 You wanna get into a big part so the space station so you could push off the wall 229 00:21:20,764 --> 00:21:25,833 and fly across like superman. 230 00:21:25,869 --> 00:21:31,306 But even as you feel super human, you quickly start to realize just how much 231 00:21:31,341 --> 00:21:33,841 the human body needs gravity. 232 00:21:35,245 --> 00:21:40,114 With gravity, I can tell which way up is. 233 00:21:40,150 --> 00:21:45,053 The weight of my body as I sit down, the weight of lifting my arms. 234 00:21:45,088 --> 00:21:49,424 All of those things constantly tell me which way is up. 235 00:21:49,459 --> 00:21:51,526 But as soon as your weightless... 236 00:21:51,561 --> 00:21:53,361 all that's gone. 237 00:21:55,498 --> 00:21:57,298 And it makes you nauseous. 238 00:21:59,169 --> 00:22:02,203 MIKE: I was feeling terrible when I first got to space. 239 00:22:02,238 --> 00:22:06,641 And I thought to myself, is this really fun? 240 00:22:06,676 --> 00:22:09,844 When you wanna throw up, really nothing's fun. 241 00:22:09,879 --> 00:22:12,380 I did puke on my first day in space. 242 00:22:16,119 --> 00:22:22,423 MAE: When you're on Earth, gravity is pulling all the fluids in your body down. 243 00:22:22,459 --> 00:22:26,694 When you're up in space, there's a major fluid shift. 244 00:22:26,730 --> 00:22:33,101 It feels like you've been standing on your head for about three hours. 245 00:22:33,136 --> 00:22:36,270 CHRIS: Gravity defines how big our heart has to be and what the configuration 246 00:22:36,306 --> 00:22:38,840 of our cardiovascular system looks like. 247 00:22:38,875 --> 00:22:44,078 The whole design of the human body, the skeleton underneath it, the strength of the muscles, 248 00:22:44,114 --> 00:22:47,181 it's really shaped by the gravity of the Earth. 249 00:22:51,821 --> 00:22:56,357 We don't really think about it, but we're constantly weight lifting on Earth. 250 00:22:56,393 --> 00:23:00,895 Holding our head up, holding our body up, fighting gravity. 251 00:23:00,930 --> 00:23:06,534 Without gravity, your muscles and your bones start to waste away. 252 00:23:06,569 --> 00:23:11,606 We have machines that, that we push against and lift against and elastics that hold us 253 00:23:11,641 --> 00:23:13,174 on the treadmill. 254 00:23:13,209 --> 00:23:17,145 Sort of gravity simulations. 255 00:23:17,180 --> 00:23:22,583 But even with the best exercise equipment we've invented so far, I lost about eight percent 256 00:23:22,619 --> 00:23:27,288 of the bone density across my hips and my upper femur. 257 00:23:27,323 --> 00:23:30,625 My skeleton started to waste away. 258 00:23:34,164 --> 00:23:39,467 What do the effects of weightlessness mean for interplanetary exploration? 259 00:23:39,502 --> 00:23:42,970 With that long time in weightlessness have degraded our bodies enough that 260 00:23:43,006 --> 00:23:47,175 we'd be useless when we get there? 261 00:23:47,210 --> 00:23:51,279 We're working on it, but we definitely haven't solved all those problems yet. 262 00:23:51,314 --> 00:23:52,947 WILL: Astronauts. 263 00:23:52,982 --> 00:23:56,951 Their heads swell and they throw up a lot. 264 00:23:56,986 --> 00:23:59,454 You don't see that in the movies. 265 00:23:59,489 --> 00:24:02,824 The truth is, we are a part of this planet. 266 00:24:02,859 --> 00:24:05,493 It is baked into our bones. 267 00:24:05,528 --> 00:24:08,863 Down here we're nurtured and protected. 268 00:24:08,898 --> 00:24:12,166 But when we go, we'll be going it alone. 269 00:24:19,468 --> 00:24:27,174 ooner or later we are going to have to get off plane. 270 00:24:27,209 --> 00:24:29,976 Plan B. 271 00:24:30,012 --> 00:24:34,648 WILL: But the second we step outside the safety of our home, we are exposed. 272 00:24:37,986 --> 00:24:43,356 CHRIS: Our sun is constantly spewing out radiation. 273 00:24:43,392 --> 00:24:50,230 And occasionally there's a huge solar flare, where a big mass ejection 274 00:24:50,265 --> 00:24:53,900 that could threaten life on Earth. 275 00:24:53,936 --> 00:24:58,739 The Earth is protected by a magnetic field in the atmosphere. 276 00:24:58,774 --> 00:25:03,977 And that force field helps deflect the deadly radiation. 277 00:25:04,012 --> 00:25:07,380 And it keeps it from driving right through and hitting our bodies. 278 00:25:09,685 --> 00:25:15,188 On board the International Space Station, we are much more vulnerable. 279 00:25:15,224 --> 00:25:21,595 If the scientists on earth have seen one of these huge storms from the sun coming towards us, 280 00:25:21,630 --> 00:25:26,099 we go to the parts of the space station that have the best protection from the storm 281 00:25:26,135 --> 00:25:29,269 of radiation that's about to pour past. 282 00:25:31,273 --> 00:25:39,246 You're subject to not just the sun's radiation, but all of the radiation of the universe. 283 00:25:39,281 --> 00:25:41,948 A strange thing sometimes happens. 284 00:25:41,984 --> 00:25:47,254 You see a flash of light out of the darkness. 285 00:25:47,289 --> 00:25:52,526 A reminder that you're not in Kansas anymore. 286 00:25:52,561 --> 00:25:58,064 When a star out in our galaxy dies in an enormous explosion that we call a supernova, 287 00:25:58,100 --> 00:26:02,269 it releases a huge amount of energy. 288 00:26:02,304 --> 00:26:06,873 Cosmic rays racing across the universe at essentially the speed of light, 289 00:26:06,909 --> 00:26:12,212 186,000 miles a second. 290 00:26:12,247 --> 00:26:17,551 So fast that those little radiation particles come by Pluto and make it all the way 291 00:26:17,586 --> 00:26:19,853 to the earth in just five hours. 292 00:26:22,057 --> 00:26:24,958 And if you're above the earth's atmosphere, 293 00:26:24,993 --> 00:26:29,129 there is nothing to stop them slamming into your body. 294 00:26:31,133 --> 00:26:34,000 Most of them you're unaware of. 295 00:26:34,036 --> 00:26:40,307 But sometimes one of these little cosmic rays goes through your optic nerve. 296 00:26:40,342 --> 00:26:47,180 And because of the way our vision is designed, it actually reacts like a flash of light. 297 00:26:47,216 --> 00:26:53,787 And what you're actually seeing is radiation going through you. 298 00:26:53,822 --> 00:26:58,758 JEFF: I'd be lying there in my sleeping bag and zap, zap, zap. 299 00:26:58,794 --> 00:27:03,597 One of the best light shows I've ever seen but at the same time, I knew that that meant 300 00:27:03,632 --> 00:27:08,201 that my head was getting zapped by charged particles. 301 00:27:08,237 --> 00:27:13,540 JERRY: And it can be a show stopper, it can be a bombardment of radiation than not only, 302 00:27:13,575 --> 00:27:16,877 you know, increases your chances of cancer down the line. 303 00:27:16,912 --> 00:27:21,047 But literally gives you radiation sickness on the way. 304 00:27:21,083 --> 00:27:25,051 If you're gonna spend weeks or months or years on a space ship, 305 00:27:25,087 --> 00:27:29,689 you have to start considering that this causes mutations. 306 00:27:29,725 --> 00:27:33,593 It overwhelms your body's ability to repair itself. 307 00:27:41,403 --> 00:27:47,340 NARRATOR: So, on our trip to colonize the stars, we know we'll get seriously zapped. 308 00:27:47,376 --> 00:27:49,743 We need to prepare for that. 309 00:27:49,778 --> 00:27:54,014 We can start in a place where the Geiger counter clicks like it would 310 00:27:54,049 --> 00:27:55,782 in a deep space mission. 311 00:28:12,401 --> 00:28:16,636 PROF. MOUSSEAU: Despite the fact that this is a dangerous place, 312 00:28:16,672 --> 00:28:23,476 Chernobyl provides this unique opportunity to examine what happens to the evolutionary 313 00:28:23,512 --> 00:28:28,081 process when you kick it with a little extra mutation. 314 00:28:30,652 --> 00:28:34,454 NARRATOR: Back in '86, I was a senior in high school. 315 00:28:34,489 --> 00:28:39,693 And I remember the nuclear meltdown that caused 400 times more fallout 316 00:28:39,728 --> 00:28:41,428 than the first atomic bomb. 317 00:28:41,463 --> 00:28:50,737 (music) 318 00:28:50,772 --> 00:28:54,941 When the reactor exploded, it was kind of like a volcano erupting. 319 00:28:54,977 --> 00:28:57,978 With radioactive metals being ejected into the atmosphere. 320 00:29:00,182 --> 00:29:04,818 That landed on the ground in a haphazard way, so there are these hot spots. 321 00:29:04,853 --> 00:29:14,894 (music) 322 00:29:14,896 --> 00:29:25,038 (music) 323 00:29:25,073 --> 00:29:31,644 You come into this landscape that was once thriving with happy people doing their thing. 324 00:29:31,680 --> 00:29:33,980 It gives you an eerie feeling. 325 00:29:35,884 --> 00:29:38,651 You really have to look around and see what's being affected. 326 00:29:43,058 --> 00:29:46,793 Many of the spiderwebs that were draped alongside some of the houses in the villages 327 00:29:46,828 --> 00:29:48,528 were extremely unusual. 328 00:29:53,835 --> 00:29:59,372 Some of the webs end up looking extraordinarily messy. 329 00:29:59,408 --> 00:30:01,708 They were very irregular. They had big holes in them. 330 00:30:06,181 --> 00:30:09,249 The spiders were having a problem spinning a normal web. 331 00:30:16,958 --> 00:30:19,726 It's not just behavior that's changing. 332 00:30:19,761 --> 00:30:23,730 Some of the creatures are even starting to look different. 333 00:30:23,765 --> 00:30:29,903 And firebugs are pretty hard to miss. f you look at it straight on, 334 00:30:29,938 --> 00:30:33,039 you'll see what looks like an African face mask. 335 00:30:33,075 --> 00:30:36,543 Two big eyes, a nose and a chi. 336 00:30:36,578 --> 00:30:42,682 And because of the symmetry, it makes it very easy to detect deviations. 337 00:30:49,291 --> 00:30:54,461 One of my colleagues picked one up and said, "Look, Tim, it's a mutant." 338 00:30:54,496 --> 00:30:59,766 This one bug was missing one of the eye spots. 339 00:30:59,801 --> 00:31:05,939 So, we starting collecting as many bugs as we could find. 340 00:31:05,974 --> 00:31:10,577 Bugs with really unusual color patterns were only found in these areas of high radiation. 341 00:31:13,448 --> 00:31:16,950 This is more serious than changing your spots. 342 00:31:16,985 --> 00:31:20,286 Mutations can kill you. 343 00:31:20,322 --> 00:31:24,591 Humans in space have a big problem. 344 00:31:24,626 --> 00:31:28,495 WILL: So, mission cancelled? Oh, not so fast. 345 00:31:28,530 --> 00:31:30,196 There might be a fix. 346 00:31:36,071 --> 00:31:39,372 NARRATOR: One of the more striking, unexpected observations 347 00:31:39,407 --> 00:31:41,708 is that some species appear to have adapted. 348 00:31:46,014 --> 00:31:50,049 Some of the bacteria where there have been thousands of generations since the accident 349 00:31:50,085 --> 00:31:52,652 are becoming more radiation resistant. 350 00:31:58,660 --> 00:32:03,296 As a species, humans are interested in expanding our horizons. 351 00:32:03,331 --> 00:32:08,067 Moving into space, moving to other planets. 352 00:32:08,103 --> 00:32:11,938 If we can develop a better understanding of the defenses used by organisms, 353 00:32:11,973 --> 00:32:15,141 that maybe useful in doping ways to protect humans. 354 00:32:16,811 --> 00:32:19,445 Both here on this rock... 355 00:32:19,481 --> 00:32:21,147 As well as in outer space. 356 00:32:28,490 --> 00:32:35,562 A traveler to Mars has to survive 9 months in space and a 30-Million-mile journey. 357 00:32:38,433 --> 00:32:42,835 WILL: But once they get there, they'll face their biggest challenge of all. 358 00:32:42,871 --> 00:32:45,205 And this time, it's personal. 359 00:32:55,024 --> 00:32:58,258 CHRIS: One of my favorite things so see from space is a pace that you know. 360 00:32:58,294 --> 00:33:00,361 You know, somewhere you grew up. 361 00:33:00,396 --> 00:33:03,831 The town you were born in. 362 00:33:03,866 --> 00:33:07,301 Or where you got married or where you went on vacation. 363 00:33:07,336 --> 00:33:12,539 It's a delight to have a memory, like a present unwrapping itself. 364 00:33:14,043 --> 00:33:17,945 The further you get from earth, one of the significant problems is, 365 00:33:17,980 --> 00:33:24,084 how do we mental the mental health of the crew when you're so isolated from the rest of humanity? 366 00:33:26,622 --> 00:33:31,458 NICOLE: We don't really know how difficult it's gonna be for humans to leave Earth. 367 00:33:31,494 --> 00:33:35,295 I mean, we're a part of earth. 368 00:33:35,331 --> 00:33:42,069 JERRY: There you are just removed from mankind and that distance, being off the planet, 369 00:33:42,104 --> 00:33:44,138 you feel a disconnect. 370 00:33:44,173 --> 00:33:47,908 And I'd say, you know, I'm sort of in a prison. 371 00:33:47,943 --> 00:33:52,713 You know, I didn't do anything wrong for sure, but I am in a prison. 372 00:33:52,748 --> 00:33:57,818 CHRIS: If I were the commander, heading to Mars, I would have a talk with the crew and say, 373 00:33:57,853 --> 00:34:02,523 "Earth is now behind us. We are now Martians." 374 00:34:09,598 --> 00:34:16,236 NARRATOR: Have they really been living in this 1,000 square foot done for over 130 days? 375 00:34:16,272 --> 00:34:22,543 After surpassing the halfway point in the mission, I'm feeling utter disbelief. 376 00:34:22,578 --> 00:34:28,048 With the nature of an isolated and confined environment, we are effectively trapped. 377 00:34:35,724 --> 00:34:44,631 HI-SEAS stands for the Hawaii Space Exploration Analogue and Simulation. 378 00:34:44,667 --> 00:34:49,403 We want to know how to keep people safe and happy in space. 379 00:34:49,438 --> 00:34:52,139 Can they stay friends, not go crazy? 380 00:34:52,174 --> 00:34:55,909 Work well together for the two to three years it will take to go to the Red Planet 381 00:34:55,945 --> 00:34:57,277 and back again. 382 00:35:00,382 --> 00:35:01,782 DR. DUNN: Contact. 383 00:35:01,817 --> 00:35:04,952 Testing, one, two, three. 384 00:35:04,987 --> 00:35:09,123 ASTRONAUT: Go with the exit protocol now. 385 00:35:09,158 --> 00:35:13,727 NARRATOR: You begin to think about how harsh it is to live on Mars, all the technology, 386 00:35:13,762 --> 00:35:16,897 all the trouble you have to go through just to go for a walk. 387 00:35:21,470 --> 00:35:25,439 One of the greatest challenges to space travel isn't technical at all. 388 00:35:25,474 --> 00:35:31,044 It's the human vulnerability. 389 00:35:31,080 --> 00:35:34,314 You don't see the ocean, you don't see palm trees. 390 00:35:34,350 --> 00:35:38,485 And you just see this black and red lava. 391 00:35:38,521 --> 00:35:43,624 It doesn't have the different gravity, the real harsh danger of Mars. 392 00:35:46,028 --> 00:35:49,229 But it does have the confinement. 393 00:35:49,265 --> 00:35:52,132 And it has the isolation from your family and friends. 394 00:35:56,605 --> 00:36:05,579 I was surprised by how much the stress affected not just how I felt, but how I performed. 395 00:36:05,614 --> 00:36:10,918 Being away from your family can be tough, even for a week or two. 396 00:36:10,953 --> 00:36:15,889 Life on Mars is an entirely different kind of separation. 397 00:36:15,925 --> 00:36:18,525 You're a pioneer. 398 00:36:18,561 --> 00:36:22,462 You're never going to see home again. 399 00:36:22,498 --> 00:36:26,567 Everything you'll ever own, you brought with you. 400 00:36:26,602 --> 00:36:29,503 The rest? You'll have to use what you find. 401 00:36:31,840 --> 00:36:35,075 Luckily, that's something humans are pretty good at. 402 00:36:35,110 --> 00:36:45,152 (music) 403 00:36:45,154 --> 00:36:54,094 (music) 404 00:37:37,606 --> 00:37:47,180 (music) 405 00:37:55,691 --> 00:38:03,797 (music) 406 00:38:17,246 --> 00:38:27,287 (music) 407 00:38:27,289 --> 00:39:06,360 (music) 408 00:39:19,575 --> 00:39:25,345 (music) 409 00:39:25,381 --> 00:39:31,084 CHRIS: We're already using simulated Martian dust to figure out how to build a settlement, 410 00:39:31,120 --> 00:39:33,353 somewhere besides our planet. 411 00:39:34,590 --> 00:39:37,891 So, we're definitely taking the first step. 412 00:39:45,901 --> 00:39:51,338 NARRATOR: Even if we survive the journey, and make the place feel like home, 413 00:39:51,373 --> 00:39:55,642 we still might not save our species. 414 00:39:55,677 --> 00:40:00,447 WILL: Because just by being there, we might turn into something else. 415 00:40:10,448 --> 00:40:15,084 CHRIS: Life tends to naturally settle where the conditions are best for it. 416 00:40:15,119 --> 00:40:19,755 And from orbit, you can actually see where we have chosen to live. 417 00:40:24,428 --> 00:40:27,963 Those patterns of human habitation repeat themselves. 418 00:40:29,734 --> 00:40:33,969 Some parts of the world are so desirable that there's not enough land to support everybody 419 00:40:34,005 --> 00:40:35,938 who wants to live there. 420 00:40:35,973 --> 00:40:43,445 (music) 421 00:40:43,481 --> 00:40:49,118 We've taken nature and modified it to make the earth more habitable for more human beings. 422 00:40:49,153 --> 00:40:53,255 (music) 423 00:40:53,290 --> 00:40:57,826 We don't really think about it, but we've significantly terraformed earth. 424 00:40:57,862 --> 00:41:05,401 The farmer's fields, the terraces, the dams we've put up. 425 00:41:05,436 --> 00:41:10,739 And when we go somewhere else, we're going to inevitably have to do the same thing. 426 00:41:10,775 --> 00:41:15,611 But at the same time, we are influenced by the environment around us. 427 00:41:15,646 --> 00:41:18,113 That shapes us. 428 00:41:18,149 --> 00:41:23,619 Your body is constantly changing itself and adapting to best perform in the environment 429 00:41:23,654 --> 00:41:24,987 that you put it into. 430 00:41:25,022 --> 00:41:35,064 (music) 431 00:41:35,066 --> 00:41:43,338 (music) 432 00:42:12,002 --> 00:42:17,673 NARRATOR: The Bajau live in a world of water. 433 00:42:17,708 --> 00:42:20,209 Their kids swim before they walk. 434 00:42:20,244 --> 00:42:30,285 (music) 435 00:42:30,287 --> 00:42:39,728 (music) 436 00:42:39,763 --> 00:42:46,268 No need for goggles or oxygen tanks, their bodies have learned to do without them. 437 00:42:46,303 --> 00:42:57,446 (music) 438 00:43:39,690 --> 00:43:42,824 The differences go deeper. 439 00:43:42,860 --> 00:43:51,033 As children, the lenses in their eyes adapt so their underwater vision is twice as sharp as ours. 440 00:43:51,068 --> 00:43:52,634 Pretty handy when you're hunting. 441 00:44:00,544 --> 00:44:03,345 In the short term, humans can adjust. 442 00:44:06,717 --> 00:44:10,185 In the long term... 443 00:44:10,221 --> 00:44:11,653 We evolve. 444 00:44:14,158 --> 00:44:18,193 Maybe there is a Goldilocks planet out there, another Eart. 445 00:44:18,229 --> 00:44:21,530 If so, we'll be spending lifetimes getting there. 446 00:44:23,000 --> 00:44:25,534 WILL: What might happen to generations born in space? 447 00:44:25,569 --> 00:44:30,472 (music) 448 00:44:30,507 --> 00:44:35,344 CHRIS: One of the ways to test that is to take life forms from Earth that have a very rapid 449 00:44:35,379 --> 00:44:40,515 life cycle and take them up to the space station and see how they develop. 450 00:44:43,354 --> 00:44:48,490 Jellyfish have small sensors, like hairs. 451 00:44:48,525 --> 00:44:52,394 And that lets them know about gravity and which way's up. 452 00:44:52,429 --> 00:44:56,665 Sort of like the balance system we have in our inner ear. 453 00:44:56,700 --> 00:45:03,705 When we took jellyfish to the space station, they did not develop normally. 454 00:45:03,741 --> 00:45:10,545 When they came back to Earth, the ones born in space couldn't tell which way was up. 455 00:45:10,581 --> 00:45:18,887 It's a sobering thought, getting to a new home might change us in ways we can't predict. 456 00:45:18,922 --> 00:45:24,693 I'm confident that no matter what is thrown at us during this incredible journey, 457 00:45:24,728 --> 00:45:27,362 we'll find a way to survive. 458 00:45:27,398 --> 00:45:31,033 But there is a cost. 459 00:45:31,068 --> 00:45:36,471 What we think of as us, can only exist here. 460 00:45:36,507 --> 00:45:41,009 We will no longer be earthlings when we get there. 461 00:45:41,045 --> 00:45:43,912 We will be become aliens. 462 00:45:45,516 --> 00:45:50,052 NARRATOR: Sometimes you can only really see something from a distance. 463 00:45:50,087 --> 00:45:55,424 WILL: No one ever got homesick staying at home. 464 00:45:55,459 --> 00:45:59,027 NARRATOR: Earth has been our constant companion. 465 00:45:59,063 --> 00:46:05,634 WILL: There when the first cell flickered to life, here now as we turn to the stars. 466 00:46:05,669 --> 00:46:07,602 She's in our bones. 467 00:46:07,638 --> 00:46:12,708 And in our guts and in our minds. 468 00:46:12,743 --> 00:46:15,677 NARRATOR: We may one day ventue out from our strange rock. 469 00:46:15,713 --> 00:46:20,515 (music) 470 00:46:20,551 --> 00:46:24,152 WILL: But we'll never get the Rock out of us. 471 00:46:24,188 --> 00:46:30,826 (music) 472 00:46:30,861 --> 00:46:32,394 NARRATOR: Next time. 473 00:46:32,429 --> 00:46:35,964 How our paradise planet was made by life. 474 00:46:35,999 --> 00:46:46,041 (music) 475 00:46:46,043 --> 00:47:02,324 (music) 45410

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