Alien Worlds《外星世界（2020）》第一季第三集完整中英文对照剧本.docx

地球数百万物种的家园The Earth, home to millions of species.但地球之外…生存着什么？But what might live... beyond?天文学家已经在我们太阳系外发现了数千个行星Astronomers have discoveredxaO thousands of planets outside our solar system. 他们相信还有数万亿个未被发现They believe there are trillions more.即使一小部分行星上存在生命If life exists on only a fraction of them,那么宇宙一定充满生机then the universe must be... alive.所有生物都有同样的需求AH living things have the same needs.进食…To feed...繁衍…reproduce...和进化and evolve.通过将地球生物的规律By applying the laws of life on Earth应用到宇宙中的其他地方to the rest of the universe...我们可以想象its possible to imagine what could live...外星世界会有什么生存on alien worlds.（美国加州里克天文台）天文学家把我们太阳系之外的行星称为系外行星Planets beyond our solar systemxaO are known to astronomers as exoplanets. 他们距地球都有数万亿公里They are allxaO trillions of miles from Earth.然而生命的微弱信♥号♥♥还是可能通过它们环绕的恒星And yet, it might be possible to detect a faint signature of life, 发出来的光被侦测到from the light of the stars they orbit.每颗恒星都向我们发送不同颜色的光Every star is sending to usxaO light of all different colors. 所以如果我们可以利用望远镜接收这种光So, if we can catch that lightxaO in our telescope利用仪器将光分散成彩虹and put it through an instrument that spreads the light out into a rainbow, 然后观察这个彩虹的丰富细节and we look in great detailxaO at that rainbow,我们能发现这颗恒星大气中we will find the chemical fingerprints各种元素的化学指纹of the elements in the atmospherexaO of that star.这是我们利用望远镜捕捉到的一颗This is one of those rainbowsxaOcapturedxaO by the telescope of a distant star约12光年之外称为天仓五的遥远的恒星的彩虹about 12 light-years away, the star Tau Ceti.我们能看到这些暗线这是恒星大气中氢元素留下的We can see these dark lines, likexaO from hydrogen in the stars atmosphere.这里我们能看到镁元素留下的具有特征性的三条线Down here, we see thesexaO three characteristic lines of magnesium.所以这就是这颗恒星的大气So, this is the atmosphere of the star,但我们想做的是but what we wanna do is catch light捕捉穿过系外行星大气的光线that passes throughxaO the atmosphere of an exoplanet,以同样的方式捕捉系外行星大气元素的指纹to capture the chemical fingerprintxaOofxaO that atmosphere in exactly the same way. 2012年在我们自己的太阳系这种指纹可以被观测到In 2012, this sort of fingerprint was visible in our own solar system.当金星从太阳前面飞过When Venus passed in front of the sun,留下了阴暗的背影it was silhouetted against it.一瞬间一个微小的光环出现了这就是金星的大气层For a moment, a tiny halo appeared, the atmosphere of Venus. 这就是天文学家寻找的一片光线Its this sliver of light astronomers are looking for.如果他们能分♥析♥遥远的系外行星的大气层If they can analyze the atmosphere of distant exoplanets也就是它们背对遥远的恒星留下的剪影silhouetted against distant stars,天文学家有可能找到生命的证据they might find proof of life.我们仔细思考过什么会是生命的信♥号♥♥Weve thought very carefully about what the signs of life will be.于是我们四处寻找我们查看大气层里有什么So we look around and we look at whats in the atmosphere能从数光年之外远程侦测到that could be remotely detectablexaO from light-years away.最终归结为同一种气体：And it always leads us backxaO to the same gas.氧气Oxygen.我们的大气层中50%到70%的氧气50 to 70 percent of oxygen in our atmosphere其实来自海洋…is actually coming from the ocean...海洋是地球的肺which is the lungs ofxaOplanet Earth.促使海洋中巨大的海带生长的过程The process that drives the growthxaO of the giant kelp in the oceans, 正如我们在陆地上看到的森林一样and, in fact, all the forestsxaO that we see on the land,都是光合作用is photosynthesis.光合作用最令我感兴趣的在于What interests me mostxaO about photosynthesis其排出的废料is the waste productxaO that gets tossed away,也就是进入大气层的氧气and thats the oxygen that goes into the atmosphere. 我们认为我们大气中几乎所有的氧气都是地球上的生物We think that almost all of the oxygen in our atmosphere is produced by photosynthesis, 通过光合作用制♥造♥的by life here on planet Earth.如果你看到某个星球上氧气充沛If you see it in abundance,你就知道那里充满生机you know that the planet is a living world.在宇宙中亿万个世界里Among trillions of worlds out there,那些有更多氧气的星球更有机会支撑生命those with more oxygen are more likely to sustain life. 想象一下…一颗类似地球的行星绕着不止一颗恒星…Imagine... a planet like Earth orbiting not one star... 而是两颗恒星旋转but two.这就是伊甸This is Eden.双太阳的光给光合作用提供了能量The light from its twin stars powers photosynthesis...将氧气大量排放到大气层中pumping oxygen into the atmosphere...供生命繁衍生息allowing life to thrive.食草动物以地面的菌类为食Grazers feed on low-lying fungus...但它们随时对危险保持警惕・.・ but theyre constantly alert to danger.树林的冠层是掠食者的家园The canopy is home to predators...进化让它们完美地适应了树上的生活・.・ perfectly evolved to live among the trees...等待出击的时机・.・ waiting for their moment to strike.在地面上食草动物有优势On the ground, the grazer has the edge.在追逐中它们更快Its faster in a chase.但掠食者进化出一种特别的武器But the predator has evolvedxaO a special weapon.这次食草动物得以逃脱This time, the grazer escapes...掠食者保存了其能量and the predator conserves its energy.在任何星球能量都是珍贵的On any planet, energy is precious.恒星的光几乎是无限的资源Starlight is a virtually infinite source.但问题在于如何将这种光转变为生命But the trick is to turn that light into life.我们在热带雨林中We are in the tropical rainforest.这里比地球的其他地方有更多种植物和动物There are more types of plants and animals here than anywhere else on。