Pratique du Shadowing: How To Terraform Venus (Quickly) - Apprendre l'anglais à l'oral avec la vidéo
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Leaving Earth to find new homes in space is an old dream of humanity, and will sooner or later be necessary for our survival.
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The planet that gets the most attention is Mars,
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a small, toxic and energy-poor planet that just about seems good enough for a colony of depressed humans huddled in underground cities.
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But what if we think bigger?
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What if we take Venus, one of the most hostile and deadly places in the solar system, and turn it into a colony.
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Not by building lofty cloud cities, but by creating a proper second Earth.
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It might be easier than you think.
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Venus is by far the hottest planet in the solar system, with a surface temperature of 460 degrees Celsius, hot enough to melt lead.
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This heat is due to the most extreme greenhouse effect in the solar system.
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CO2 is great at trapping heat.
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Even a rise from 0.03% to 0.04% in Earth's atmosphere is heating up our planet right now.
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Venus's atmosphere is 97% CO2.
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Also, Venus's atmosphere is 93 times denser than Earth's.
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Standing on Venus's surface would feel like taking a dive about 900 meters deep into the ocean.
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The pressure would kill you instantly.
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It's a truly horrible place, so why should we even bother?
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First and foremost, Venus is almost as big as Earth and has 90% of its surface gravity.
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Surface gravity is a big problem when colonizing the solar system
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because it's very likely that long stays in low-gravity places will have negative health effects.
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Venus's size means it could be the second largest habitat in the solar system.
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A new home for billions of humans and trillions of animals, with oceans, lush forests and a beautiful blue sky.
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A properly terraformed Venus may be the most pleasant place to live outside of Earth.
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While we can't exactly terraform Venus today, a slightly more ambitious future version of us could take this project on.
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It will take a few generations to complete and be a huge challenge, like building the Great Pyramids was for our ancestors.
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But then, it's not like humans have never started projects that took more than a lifetime to complete.
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Okay, let's do it.
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Before anything else, we need to cool Venus down and remove the gas that makes up the extremely heavy atmosphere.
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As mentioned, there's a lot of it.
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Around 465 million billion tons.
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How do we do that?
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There are a few options.
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We could create giant solar collectors powering a huge array of laser beams
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that heat up the atmosphere so much that it's blasted into space.
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Although we would need thousands of times the entire power generating capacity of humanity
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and it would still take thousands of years to remove the atmosphere.
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Another way is to sequester the atmosphere, binding the CO2 in different compounds through chemical reactions.
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We could mine elements like calcium or magnesium on mercury and shoot them at Venus via mass driver systems,
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electric rails that make rockets unnecessary on smaller planets.
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The metals would combine to bind the CO2 into different carbonates basically forever.
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But the scale makes the whole thing impractical.
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We would need several hundred billion tons of material to sequester the CO2 this way.
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Seems like a waste of material and might take too long.
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An equally ridiculous idea that could actually work is to put Venus in the shade,
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literally, by constructing a huge mirror to blot out the Sun to just freeze the atmosphere.
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The mirror doesn't need to be complex or massive, just a very thin foil with a little structural support.
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Building such a large flat surface
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so close to the Sun will turn it effectively into a solar sail and push it out of position.
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So instead of one giant circular object, our mirror will consist of many different pieces.
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Annular slats of angled mirrors can reflect sunlight from one set of mirrors to the next.
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Mirrors would be angled, reflecting light from one to another until the light is redirected to the back, balancing the force on the front and holding them in position.
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After a few years of getting the infrastructure in place, things start slowly and then escalate.
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For the first few decades, the atmosphere slowly cools down but stays dense and deadly.
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Until after some 60 years, it reaches the critical temperature of 31 degrees Celsius.
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Suddenly, the Great Flood begins on Venus as CO2 turns to liquid at this pressure and begins to rain down.
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A constant global rainstorm of unbelievable proportions lasting 30 years.
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The pressure and temperature suddenly begin to drop in unison.
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For almost a century, puddles turn into lakes and oceans.
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The surface temperature is now minus 56 degrees Celsius and the pressure has dropped to only seven times the pressure on Earth.
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Finally, at a really unpleasant minus 81 degrees Celsius, the CO2 oceans begin to freeze and the rain turns into snow.
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This leaves us with a frozen Venus covered in oceans as hard as rock and gigantic CO2 glaciers.
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remains of the atmosphere is mostly nitrogen at about three times Earth's surface pressure.
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If you don't mind freezing and suffocating, you can now take a stroll over Venus's surface.
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But the frozen CO2 remains a bit of a problem.
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At some point we want to warm up the planet, but if we do, the CO2 ice will melt and fill up the atmosphere again.
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So we need some way to keep it from doing that.
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One is to simply cover it all with cheap plastic insulation
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and cover it up with ground up Venus rock or water oceans.
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Although some planetary scientists will be very stressed out about us building a new planet containing a potential time bomb like that.
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A few unfortunately timed volcanoes could melt a lot of CO2 at once and ruin everything.
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Another obvious solution is to shoot it all out into space
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and collect it into a small moon for storage and future use.
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We can make this more efficient by using mass drivers instead of rockets, but moving all that mass will still be a pretty intense challenge that will take some time to solve.
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Whatever we end up doing with the atmosphere, to move forward we need water, which we could get from ice moons.
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Europa, a moon of Jupiter, has twice as much water as Earth's oceans.
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Now, catching a moon and transporting it through the solar system is not exactly easy.
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So instead, it might be easier to cut chunks of ice off Europa
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with an army of construction drones and shoot them at Venus using more of those mass drivers.
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Space tethers could save us a lot of effort and energy here.
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We made a whole video explaining how they work, but in a nutshell, they are slings that can take a payload on both ends.
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On Europa, they do most of the work needed to catapult our ice to Venus.
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The ice hits the Venus tethers, which gently drop it into the atmosphere, where it falls down as snow.
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In exchange, the Venus tethers get to catch CO2 ice shot up from below and accelerate it into orbit.
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We can remove excess nitrogen using this same method to further lower our atmospheric pressure.
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After a few decades or centuries, Venus would be covered by a nice, shallow, frozen ocean a few hundred meters deep.
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It would look extremely different from today.
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A few continents and countless islands have formed.
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This is beginning to look a bit like our planet planet.
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Now the last and most magnificent phase of terraforming begins, making the atmosphere breathable and adding life.
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First, we need light though, and we need to heat the planet up again.
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A Venus day is 2,802 hours long, more than 116 Earth days.
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So, if we just remove our giant mirror, we would grill half of our planet.
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Even without the massive atmosphere, temperatures would reach unbearable levels.
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The simplest way to create a day-night cycle
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and let some energy in again is with another set of mirrors to illuminate our continents and melt our water oceans,
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which would let us completely control how much energy we get and where it goes.
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The atmosphere is now mostly made up of nitrogen and basically devoid of oxygen.
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So the first inhabitants will likely be trillions and trillions of cyanobacteria, which can get photosynthesizing and release oxygen.
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We know that they can quickly turn around the atmosphere of a planet
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because billions of years ago they were probably responsible for turning
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the toxic atmosphere of our young earth into an atmosphere with enough oxygen for more complex animal life.
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But not only that, cyanobacteria can fix nitrogen from the atmosphere
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and turn it into nutrients that can be used by living beings.
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This way, they will essentially fertilize our dead ocean water and prepare it for more complex organisms. On land,
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our colonists need to grind down some of the former Venusian surface to make soil for nitrogen-fixing plants to grow on.
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Eventually billions of trees would spread, creating large forests covering massive parts of the continents.
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Venus would turn green.
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To speed things up, CO2 would be strategically released to supply the plants and cyanobacteria.
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Areas already covered with plants could get extra daylight from our orbital mirrors
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so the plants would be active for most of each day.
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Maybe we won't have to do this with the same plants and animals we know today.
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As genetic engineering matures and our understanding of genetics and the machinery of life expands, we might just engineer life as we need it.
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All in all, it would take several thousand years to make the atmosphere breathable by humans.
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In the meantime, you could stroll around with nothing more than regular clothes and an oxygen mask.
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Settlers would enjoy a vast new planet, filled with resources and bathed in sunlight.
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They might think of new ways to use the vast amounts of carbon dioxide ice and nitrogen orbiting in space above,
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industrial processes, rocket fuel, or even boosting the terraforming of another planet like tiny Mars.
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Venus is fully terraformed.
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Animals roam through vast ecosystems.
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are being constructed.
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Billions of settlers and their descendants make this world their home.
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They will see images of the past.
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How Venus was once the most hostile planet around.
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How it took hundreds of years to freeze hell
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and to ship in the oceans and another few thousand years to make it possible to breathe freely.
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They will barely be able to believe it.
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Okay, maybe it's not that It's easy to terraform Venus
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and a lot of things must go right for this future to become reality.
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But it is possible and with technology
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that is within the reach of a motivated and slightly more advanced humanity that wants to venture into space.
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The only thing that's stopping it is our imagination.
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And that at least is a problem that's easy to overcome.
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Welcome to the Kurzgesagt Lab.
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Let's conduct a few stellar experiments.
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We'll first add some more mass to this protostar.
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More.
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A bit more.
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Wow, we've just created a blue giant.
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A star with 10 times the mass of our Sun.
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Let's now add a couple of million years and see what happens.
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A supernova.
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Breathtaking.
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And look, it leaves behind a black hole.
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Fascinating stuff.
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Now we record our findings.
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Be careful to preserve the sparkle.
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It's now time for Duck's final inspection.
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This one is always a nail biter, he has incredibly high standards.
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Luckily for us, our work is scientifically accurate, offers an overview of important astrophysical processes and is a real stunner.
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Duck approves.
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Looks like it's ready to be shared with the world as a poster, a very special piece of Kurzgesagt you can take home and touch.
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You can get this very special poster along with many other sciencey
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and spacey things created with love and care from our shop.
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Every Kurzgesagt product you buy directly funds another moment we get to spend working on our videos.
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Thank you so much for being a part of our story and for making this channel possible.
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Thank you.
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale de niveau C1 s’appuie sur la vidéo « How To Terraform Venus ». Les mots qui reviennent le plus souvent : Venus, atmosphere, planet, ocean, mirror. Cette vidéo contient 155 phrases et 2031 mots à répéter en shadowing. La partie parlée dure 12:40. Le locuteur parle à un rythme naturel d’environ 160 mots par minute, proche d’une conversation courante. Seuls 79 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.
Vocabulaire clé de cette vidéo
Les 15 mots les plus avancés de la vidéo, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| nitrogen nom | /ˈnaɪ.tɹə.d͡ʒən/ | azote |
| terraform verbe | /ˈtɛɹəfɔː(ɹ)m/ | terraformer |
| melt verbe | /mɛlt/ | fondre, se dissoudre |
| cyanobacterium nom | cyanobactérie | |
| tether nom | /ˈtɛðəɹ/ | longe |
| continent nom | /ˈkɑntɪnənt/ | continent |
| breathable adjectif | /ˈbɹiːðəbəl/ | respirable |
| sequester verbe | /sɪˈkwɛs.tɚ/ | séquestrer, mettre sous séquestre |
| settler nom | /ˈsɛt.lɚ/ | colon |
| terraforming nom | /ˈtɛɹəfɔːmɪŋ/ | terraformation, terraforming |
| stroll verbe | /stɹoʊl/ | flâner, se promener |
| sunlight nom | /ˈsʌnˌlaɪt/ | lumière du soleil |
| dense adjectif | /ˈdɛns/ | dense |
| construct verbe | /ˈkɑn.stɹʌkt/ | construire |
| minus | /ˈmaɪ.nəs/ | moins |
Les verbes à particule que vous entendrez
| Mot | Prononciation | Sens |
|---|---|---|
| heat up verbe | chauffer | |
| cool down verbe | /kuːl ˈdaʊn/ | se refroidir, refroidir |
| end up verbe | se terminer, se finir | |
| fall down verbe | /fɔl ˈdaʊn/ | tomber |
| fill up verbe | remplir | |
| leave behind verbe | abandonner | |
| make up verbe | /ˌmeɪk ˈʌp/ | constituer, composer |
| turn around verbe | retourner |
Des phrases à répéter
Des phrases courtes et complètes de la vidéo, à réutiliser dans la conversation de tous les jours :
- It's a truly horrible place, so why should we even bother?
- How do we do that?
- The only thing that's stopping it is our imagination.
- Let's conduct a few stellar experiments.
- We'll first add some more mass to this protostar.
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Phrases conditionnelles if + proposition, will/would + verbe — une condition et son résultat | if we do, the CO2 ice will melt |
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | would be angled · would be covered · is now mostly made |
| Present perfect have/has + participe passé — une action passée qui compte encore maintenant | have never started · has dropped · have formed |
Prononciation à surveiller
Le locuteur utilise 6 contractions et formes réduites, comme can't, doesn't, don't. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Les sons « th »: tether /ˈtɛðəɹ/, breathable /ˈbɹiːðəbəl/, breathtaking /ˈbɹɛθˌteɪ.kɪŋ/
- Les sons « sh » et « zh »: nutshell /ˈnʌt.ʃɛl/, glacier /ˈɡleɪ.ʃɚ/, insulation /ˌɪnsəˈleɪʃən/, ambitious /æmˈbɪʃ.əs/, machinery /məˈʃiːnəɹi/
- Mots longs — placez bien l’accent: terraforming /ˈtɛɹəfɔːmɪŋ/, illuminate /ɪˈl(j)umɪneɪt/, impractical /ɪmˈpɹæktɪkəl/, inhabitant /ɪnˈhæb.ɪ.tənt/, magnesium /ˌmæɡˈnizi.əm/
Les sons difficiles pour les francophones :
- /h/ — il se souffle, il n’est pas muet: hostile /ˈhɑstəl/, huddle /ˈhʌdəl/, inhabitant /ɪnˈhæb.ɪ.tənt/, greenhouse /ˈɡɹːnˌ(h)aʊs/, habitat /ˈhæb.ɪ.tæt/
- /tʃ/ et /dʒ/ — à ne pas adoucir en « ch » et « j »: nitrogen /ˈnaɪ.tɹə.d͡ʒən/, gigantic /d͡ʒaɪˈɡæntɪk/, chunk /t͡ʃʌŋk/, genetics /dʒəˈnɛt.ɪks/, gently /ˈd͡ʒɛntli/
- /r/ anglais — langue recourbée, sans frotter la gorge: nitrogen /ˈnaɪ.tɹə.d͡ʒən/, terraform /ˈtɛɹəfɔː(ɹ)m/, tether /ˈtɛðəɹ/, breathable /ˈbɹiːðəbəl/, terraforming /ˈtɛɹəfɔːmɪŋ/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Commencez à la vitesse 0,75×, répétez phrase par phrase, puis revenez à la vitesse normale quand cela devient facile.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme nitrogen, terraform, melt.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.