Prática de Shadowing: What If Earth got Kicked Out of the Solar System? Rogue Earth - Aprenda a falar inglês com o YouTube
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The night sky seems peaceful and orderly.
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The night sky seems peaceful and orderly.
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But in reality, stars are careening through the galaxy at speeds of hundreds of thousands of kilometers per hour.
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Not bound by static formations, but changing neighborhoods constantly.
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Fortunately, space is big, and so the stars of the Milky Way are very unlikely to hit us.
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Unfortunately, they don't have to hit anything to make us have a really bad time on Earth.
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And there are already stars, starting to get very close.
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To understand how dangerous stars are to us, we need to talk about gravity.
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Gravity attracts every piece of matter to every other piece of matter in the universe.
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You are attracted by an atom a million light years away and vice versa.
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Luckily, this force gets weaker over distance, and it also depends on how massive something is.
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So, things that are close and are very massive are more attractive, winning the cosmic tug-of-war.
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This way, massive things define how smaller things behave around them.
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The Sun makes up 99.75% of all the mass in the solar system, and so it shapes the behavior and orbits of everything else in it.
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Billions of years ago, after the Sun was born, The solar system was a chaotic and dangerous place as the planets were formed from countless little pieces that collided constantly.
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But over the eons, a stable balance emerged.
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Today, most planets and asteroids have settled into safe and predictable orbits.
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We have the inner and outer planets, the asteroid and Kuiper belt, and at the edge, the Oort cloud, a giant sphere of comets orbiting slowly in cold storage.
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We really don't want this balance to be disturbed.
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If another star came too close to us, its gravity would pull on everything in the solar system like a spoiled toddler, messing up the pleasant order of the planets and asteroids and comets.
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This isn't some imaginary danger.
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Some 70,000 years ago, a red dwarf-brown dwarf binary system passed through the Oort cloud and messed things up.
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It might even have sent a deadly onslaught of asteroids our way.
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But it could take two million years until those visitors from the Oort cloud arrive in the inner solar system.
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But there's a much bigger problem on the horizon.
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Gliese 710, a red dwarf with about half the mass of the Sun, is currently headed towards the solar system.
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In about a million years, it will pass through the Oort Cloud and become the brightest star in the night sky.
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A close flyby like this would unfold over hundreds of thousands of years, disrupting the orbits of millions of objects in the Oort Cloud considerably.
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If we are unlucky, it will trigger a new period of planetary bombardment, similar to the early solar system.
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The night sky could be filled with comets and asteroids raining down on the inner solar system.
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The larger ones could cause dinosaur-level mass extinctions and would be bad for the stock market.
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But it could get much worse.
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The galaxy is an intense place, and stars get close to each other regularly.
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So it is possible that a star could come much closer and not just pass us, but fly directly through the inner solar system.
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This would be very bad in the extreme.
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The chance of another star colliding with the Sun is astronomically unlikely, but that isn't what we're worried about.
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If another star were to pass by about as close as the Earth is from the Sun, it could easily eject the Earth from the solar system.
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The odds of such an event are estimated to be around 1 in 100,000 in the next 5 billion years.
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Small, but not absurdly so.
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As we discussed in another video, there seem to be billions of rogue planets doing their own thing in the galaxy
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and this is one way to make them.
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So if this were to happen with an average red dwarf, what would happen on Earth?
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Kicking Earth out of the solar system.
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As the star enters the solar system, a small orangish dot appears in the sky that grows bigger and bigger for months, eventually becoming visible during the day.
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It would get bigger and much brighter than the moon.
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Too bright to look at directly.
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the night sky would be filled with an eerie red glow.
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After a few months, it would start shrinking again.
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But so would the sun.
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Over a few years, the sun slowly grows smaller in the sky, and with it warmth and light start to dissipate.
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All around the world, as the days turn dark, the final winter of humanity would begin.
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The polar ice caps begin to grow and spread, while plants shrivel and die.
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Forests freeze, and animals die in droves.
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As the Earth passes the orbit of Mars, the average surface temperature has plummeted to near minus 50 degrees Celsius.
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From space, Earth begins to look like an icy moon, the blue-green surface becoming the pale grey-white of death.
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As global infrastructure breaks down, people huddle together indoors, burning what they can for warmth as the temperature continues to drop,
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counting the days until they'll be out of food which no longer grows.
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Everybody living at the surface is living on borrowed time.
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By the time Earth reaches Jupiter's orbit, surface temperatures sink to minus 150 degrees Celsius, lower than the coldest ever recorded temperatures in Antarctica.
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Needless to say, by now almost everyone is dead.
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Without the energy from sunlight to evaporate water, clouds don't form and the water cycle stops.
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The polar ice caps eventually touch at the equator and the oceans become covered in a thick layer of ice.
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As more and more of its heat leaks out, more water freezes onto the bottom of the ice sheet, the concentration of salt in the deep ocean grows, poisoning most animals that survived here.
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Although around hydrothermal vents, communities of extremophiles might adapt even to these circumstances.
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Deep below the surface, some bacteria would not notice much of any of this, as they're still kept warm by the radioactive decay of elements in the Earth's core.
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As the Earth reaches the orbit of Pluto and the Kuiper belt, the Sun is still the brightest star in the but it's one among many,
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with stars now visible during the day.
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The temperature is now barely 40 degrees Celsius above absolute zero, below the freezing temperature of the gases in the atmosphere.
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A weird spectacle, enjoyed by no one unfortunately, unfolds as the atmosphere turns into nitrogen and then oxygen snow.
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Over a few years, it's deposited into an icy 10 meter thick sheet all over the planet's surface, with only a thin whisper of gas remaining.
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The frozen corpses of flora and fauna are buried beneath them.
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As Earth leaves the solar system, it becomes a rogue planet, traveling alone through the dark, lifeless and in solitude.
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But weirdly enough, there is hope.
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Humanity would not be surprised by this potential extinction event.
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We'd notice it thousands of years in advance.
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There's not a lot we could do to stop a star, but we could prepare.
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Most of us would perish, but a few million could survive in huge artificial complexes powered by geothermal and nuclear energy,
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possibly even fusion if we can learn to use the ice around us for power.
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Here, humanity might survive for hundreds of thousands of years.
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At some point, we would become used to our circumstances, and new generations would watch documentaries in disbelief about the time we had our own star
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and could walk the surface of Earth.
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And at some point, we might decide to look for another home.
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If the Earth were lucky enough to pass by another star with a habitable planet, we could try to make a fresh start.
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Spaceflight, oddly enough, would become very easy without the atmosphere in the way.
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So it's not unthinkable that the last survivors would leave Earth behind
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and try again on a new planet around a new star.
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Maybe one day, thousands of years later, the descendants of humanity will tell legends about Earth's ancient past.
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Stories of our lost home, of a mysterious icy planet, floating alone and empty through the dark of space.
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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 ten 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.
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He has incredibly high standards.
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Lucky 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.
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A very special piece, of course, 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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Contexto e Antecedentes
O vídeo "E se a Terra fosse expulsa do Sistema Solar? Terra Errante" explora um cenário hipotético fascinante onde a Terra poderia ser ejetada de seu sistema, desvendando a dinâmica envolvente entre estrelas e a gravidade que as rege. Nele, o apresentador discute como as estrelas se locomovem no vasto universo e como a gravidade influencia drásticas alterações no equilíbrio do nosso sistema solar. Esse contexto traz não só um aprendizado científico, mas também uma profundidade de vocabulário útil para aqueles que desejam melhorar sua prática de conversação em inglês.
Top 5 Frases para Comunicação Diária
- “A gravidade atrai cada pedaço de matéria.” - Uma frase fundamental que nos ensina sobre a força que mantém os corpos celestes em suas órbitas.
- “Se outra estrela passar muito perto de nós…” - Uma forma de abordar cenários hipotéticos, útil para discussões.
- “A noite poderia ser preenchida com um brilho vermelho.” - Adiciona um elemento descritivo às suas conversas sobre o céu e os fenômenos naturais.
- “Isso não é um perigo imaginário.” - Como exprimir que um risco é real, importante em diálogos sobre segurança.
- “A Terra poderia ser expulsa do sistema solar.” - Uma maneira de expressar situações extremas de forma acessível.
Guia Passo a Passo de Shadowing
Praticar com o shadow speak pode transformar sua fluência em inglês, especialmente com conteúdos complexos como o deste vídeo. Siga este guia para aprimorar sua prática de conversação em inglês.
- Assistir o vídeo com legendas em português: Comece assistindo ao vídeo nessa configuração para capturar o contexto geral e familiarizar-se com o conteúdo.
- Reproduzir trechos curtos: Escolha frases específicas e escute-as repetidamente. Tente imitar a pronúncia e a entonação do narrador.
- Interromper e repetir: Pause o vídeo após cada frase e repita em voz alta, tentando igualar a velocidade e a naturalidade do discurso original.
- Gravar sua voz: Ao repetir as frases, grave-se. Isso ajudará a identificar áreas onde você pode melhorar sua articulação e pronúncia.
- Praticar a conversa em grupo: Se possível, discuta os temas abordados no vídeo com amigos ou colegas, utilizando as frases que você aprendeu. Isso reforça e aplica o que você trabalhou.
Com a determinação e estas técnicas de shadowing, como o "shadowing em inglês", você se tornará mais confiante em seu uso da língua, capaz de engajar em conversas mais profundas sobre temas fascinantes como o universo. Explore, pratique e não hesite em revisitar este shadowing site oportunidades futuras de aprimoramento!
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.
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