쉐도잉 연습: Why is the sky blue? - 영상으로 영어 말하기 배우기
레슨 만드는 중...
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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.
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이 레슨에 대해
"Why is the sky blue?"으로 쉐도잉 기법을 사용해 영어를 연습합니다.
매일 15~30분 꾸준히 연습하면 IELTS 스피킹에 대한 자신감이 길러집니다.
쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법
쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.