Prática de Shadowing: Why is the sky blue? - Aprenda a falar inglês com vídeo
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Hi it's Doug.
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I've got a plastic sandwich bag and I was noticing how
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if you look through one plastic sandwich bag it's clear but
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if you get a whole bunch of them check this out
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now it's not clear it looks kind of blue you see
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that the reason I have these plastic sandwich bags with me is
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because I heard there's an interesting question this week from someone named Celine Let's give her a call now.
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Hi, Doug.
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Hi, Celine.
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Good to see you.
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Our class has a question for you.
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Why is the sky blue?
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That's a great question.
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Before I say anything, I want you to stop and think about it.
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What do you think?
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Could you come up with any idea for why you think the sky is blue?
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Now would be a good time to pause the video so that you can think and discuss this with someone near you.
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Okay, you ready?
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There are a lot of different ideas you could have come up with.
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I can't guess all of the ideas you might have had, but I'll bet at least one of you thought, maybe the sky is blue because our oceans are blue.
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Like, maybe the sky reflects the color of our oceans.
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That's a really interesting idea.
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There's actually a way to figure out if that's the reason.
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Think about it.
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If the color of the sky had to do with the color of Earth's surface, then if you were in the middle of a continent, surrounded by thousands of miles of land,
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like this, then the sky shouldn't look blue at all, right?
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It should actually look green, reflecting the color of all the land.
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But that's not the case.
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Even people who live in the middle of a whole bunch of land still see blue sky.
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Why is the sky blue then?
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This is a hard question to solve.
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Scientists themselves didn't know for a long time.
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Here's an interesting clue I can point out though.
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We've sent spacecraft up to the moon and to other planets.
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And it turns out the sky in those places isn't blue.
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Have a look at the sky as seen from the moon.
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Whoa, it's a black sky.
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Okay, now let's check out what the sky looks like from Mars.
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You ready?
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Here it is.
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Weird, it's kind of a yellowish sky.
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So the Moon's sky and Mars' sky are somehow different from Earth's sky.
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What's going on here?
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Well, keep in mind, our own sky is made out of air.
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It turns out the Moon has no air at all, so the sky just looks like outer space, even when you're on the surface of the Moon.
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Now Mars' sky has air, but it's a different kind of air than what's found on Earth.
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It's mostly made of a gas called carbon dioxide.
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So the blue color of Earth's sky, this is a view from space, it has something to do with the kind of air that Earth has.
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Our air is made of two gases.
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It's got some oxygen.
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That's the part of air that our bodies need to breathe in.
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And Earth's air has a whole bunch of another gas, too, called nitrogen.
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When the sunlight shines on all that oxygen and nitrogen, it looks blue to our eyes.
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And the reason Mars' sky looks yellow is because of the gas that its sky is made of.
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When sunlight shines on carbon dioxide, it looks yellow.
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Now, I have to point something out.
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This is not the full story.
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There's more to this question.
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It's complicated.
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The reason that our planet's air looks blue also has something to do with how light works.
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Look around you.
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You're surrounded by Earth's air.
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It's the same stuff that's in our sky.
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But it doesn't look blue, does it?
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No, it's clear.
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You see, it matters how much air you're looking at.
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When you look up at the sky you're looking at a
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lot more air than just the air in the room around you.
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Sometimes when you have a lot of something, like this water in a swimming pool, it can look different than when you just have a little bit of something, like this water in a glass of water.
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It's also kind of like those plastic sandwich bags I was playing with earlier.
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Just one of them looks clearer, but when you have a whole bunch of them the color looks different,
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doesn't it it's interesting here's another thing to notice our sky
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isn't always blue is it at the time around sunrise
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or sunset you can see lots of different colors especially reddish orange color
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all of this is something we can explore in a future episode
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but as a first step toward understanding why our sky is blue you can just notice
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that our sky is blue because of the type of air we have in our sky.
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We can see for ourselves by comparing the color of our
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sky with the color of the sky on other planets and the moon.
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The way that light works, when you have a whole bunch of our type of air, it looks blue to our eyes.
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Thanks, Selene, for asking that question.
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Now, for the next episode, I reached into my question jar and found three questions submitted to me that I'm thinking about answering.
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When this video is done playing, you'll get to vote on one.
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you can choose from why do people have different eye colors
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or if the earth is round why does it look flat
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or how did alligators get their name so submit your vote
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when the video is over I want to hear from all
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of you watching now just like a lot of you are
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taking a summer break I'm gonna take a break as well
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but I'll be back in September remember there are mysteries all around you.
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Have fun and stay curious.
📺 Mesmo canal
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Vocabulário e dicas de fala para esta lição
Este vídeo tem 91 frases e 1002 palavras para praticar shadowing. A fala dura 6:03. O falante fala em ritmo natural, cerca de 166 palavras por minuto, próximo de uma conversa do dia a dia. 89% das palavras estão entre as 3.000 mais comuns do inglês, por isso o vocabulário é fácil de acompanhar.
Vocabulário principal deste vídeo
15 palavras do vídeo que vale a pena aprender, com pronúncia e significado:
| Palavra | Pronúncia | Significado |
|---|---|---|
| reflect verbo | /ɹɪˈflɛkt/ | refletir |
| submit verbo | /səbˈmɪt/ | ceder, entregar-se |
| oxygen substantivo | /ˈɑksɪd͡ʒən/ | oxigênio, oxigénio |
| shine verbo | /ʃaɪn/ | brilhar, luzir |
| sunlight substantivo | /ˈsʌnˌlaɪt/ | luz do sol |
| dioxide substantivo | /daɪˈɑksaɪd/ | bióxido |
| surround verbo | /səˈɹaʊnd/ | contornar, cercar |
| nitrogen substantivo | /ˈnaɪ.tɹə.d͡ʒən/ | azoto, nitrogênio |
| complicated adjetivo | /ˈkɑm.plɪˌkeɪ.tɪd/ | complicado |
| compare verbo | /kəmˈpɛɚ/ | comparar |
| curious adjetivo | /ˈkjʊɹ.i.əs/ | curioso |
| mystery substantivo | /ˈmɪs.t(ə.)ɹi/ | mistério |
| solve verbo | /sɒlv/ | resolver, solucionar |
| explore verbo | /ɪkˈsploɹ/ | explorar |
| breathe verbo | /bɹiːð/ | respirar |
Phrasal verbs que você vai ouvir
| Palavra | Significado |
|---|---|
| come up with verbo | pensar (em), alcançar |
| turn out verbo | terminar |
| check out verbo | verificar, sacar só |
| figure out verbo | descobrir, deduzir |
| point out verbo | apontar |
Pronúncia para ficar de olho
O falante usa 19 contrações e formas reduzidas, como you're, doesn't, I'll. Diga-as na forma curta, do jeito que você ouve.
- Os sons de “sh” e “zh”: shine /ʃaɪn/, reddish /ˈɹɛdɪʃ/, yellowish /ˈjɛlɔʊɪʃ/
- Palavras longas — acerte a sílaba tônica: complicated /ˈkɑm.plɪˌkeɪ.tɪd/, alligator /ˈæl.ɪ.ɡeɪ.tɚ/
Como praticar com este vídeo
- Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
- Comece na velocidade 0,75×, faça shadowing frase por frase e volte à velocidade normal quando ficar fácil.
- Grave a sua voz e compare com o original, prestando atenção a palavras como reflect, submit, oxygen.
Gramática neste vídeo
As estruturas que o falante mais usa, com as palavras exatas do vídeo:
| Estrutura | No vídeo |
|---|---|
| Voz passiva be + particípio passado — o foco está no que acontece, não em quem faz | is made · is done |
| Past continuous was/were + -ing — uma ação em andamento em um momento do passado | was noticing · was playing |
| Conselho com “should” should + verbo — dizer o que é uma boa ideia | shouldn't look · should actually look |
| Present continuous am/is/are + -ing — algo que está acontecendo agora ou nestes dias | you're looking · I'm thinking |
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.