쉐도잉 연습: How To Terraform Venus (Quickly) - 영상으로 영어 말하기 배우기
레슨 만드는 중...
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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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