シャドーイング練習: How far would you have to go to escape gravity? - Rene Laufer - YouTubeで英語スピーキングを学ぶ
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More than six thousand light years from the surface of the earth, a rapidly spinning neutron star called the Black Widow pulsar blasts its companion brown dwarf star with radiation as the two orbit each other every 9 hours.
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More than six thousand light years from the surface of the earth, a rapidly spinning neutron star called the Black Widow pulsar blasts its companion brown dwarf star with radiation as the two orbit each other every 9 hours.
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Standing on our own planet, you might think you’re just an observer of this violent ballet.
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But in fact, both stars are pulling you towards them.
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And you’re pulling back, connected across trillions of kilometers by gravity.
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Gravity is the attractive force between two objects with mass— any two objects with mass.
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Which means that every object in the universe attracts every other object: every star, black hole, human being, smartphone, and atom are all constantly pulling on each other.
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So why don’t we feel pulled in billions of different directions?
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Two reasons: mass and distance.
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The original equation describing the gravitational force between two objects was written by Isaac Newton in 1687.
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Scientists’ understanding of gravity has evolved since then, but Newton’s Law of Universal Gravitation is still a good approximation in most situations.
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It goes like this: the gravitational force between two objects is equal to the mass of one times the mass of the other, multiplied by a very small number called the gravitational constant, and divided by the distance between them, squared.
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If you doubled the mass of one of the objects, the force between them would double, too.
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If the distance between them doubled, the force would be one-fourth as strong.
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The gravitational force between you and the Earth pulls you towards its center, a force you experience as your weight.
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Let’s say this force is about 800 Newtons when you’re standing at sea level.
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If you traveled to the Dead Sea, the force would increase by a tiny fraction of a percent.
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And if you climbed to the top of Mount Everest, the force would decrease— but again, by a minuscule amount.
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Traveling higher would make a bigger dent in gravity’s influence, but you won’t escape it.
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Gravity is generated by variations in the curvature of spacetime— the three dimensions of space plus time— which bend around any object that has mass.
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Gravity from Earth reaches the International Space Station, 400 kilometers above the earth, with almost its original intensity.
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If the space station was stationary on top of a giant column, you’d still experience ninety percent of the gravitational force there that you do on the ground.
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Astronauts just experience weightlessness because the space station is constantly falling towards earth.
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Fortunately, it’s orbiting the planet fast enough that it never hits the ground.
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By the time you made it to the surface of the moon, around 400,000 kilometers away, Earth’s gravitational pull would be less than 0.03 percent of what you feel on earth.
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The only gravity you’d be aware of would be the moon’s, which is about one sixth as strong as the earth’s.
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Travel farther still and Earth’s gravitational pull on you will continue to decrease, but never drop to zero.
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Even safely tethered to the Earth, we’re subject to the faint tug of distant celestial bodies and nearby earthly ones.
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The Sun exerts a force of about half a Newton on you.
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If you’re a few meters away from a smartphone, you'll experience a mutual force of a few piconewtons.
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That’s about the same as the gravitational pull between you and the Andromeda Galaxy, which is 2.5 million light years away but about a trillion times as massive as the sun.
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But when it comes to escaping gravity, there’s a loophole.
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If all the mass around us is pulling on us all the time, how would Earth’s gravity change if you tunneled deep below the surface, assuming you could do so without being cooked or crushed?
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If you hollowed out the center of a perfectly spherical Earth— which it isn’t, but let’s just say it were— you’d experience an identical pull from all sides.
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And you’d be suspended, weightless, only encountering the tiny pulls from other celestial bodies.
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So you could escape the Earth’s gravity in such a thought experiment— but only by heading straight into it.
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このレッスンについて
このレッスンでは、重力に関する科学的な概念を学びながら、英語の発音を良くするための練習を行います。トランスクリプトの内容を通じて、重力の基本的な説明から、遠くの天体が私たちにどのように影響を与えているのかについて考えていきます。特に、科学的な語彙を強化し、流暢さを向上させるための英語スピーキング練習に焦点を当てます。理解を深めるだけでなく、リスニングスキルや発音も向上させることが目指せます。
重要な語彙とフレーズ
- 重力 (gravity): 物体同士が引き合う力
- 質量 (mass): 物体の量を示す指標
- 半径 (radius): 円や球体の中心から外周までの距離
- ニュートン (Newton): 重力の力を測る単位
- 放射線 (radiation): 物質がエネルギーを放出する現象
- 無重量 (weightlessness): 重力を感じない状態
- 宇宙空間 (outer space): 地球の大気の外に広がる空間
- 天体 (celestial body): 星や惑星などの宇宙の物体
練習のヒント
このビデオのリズムやトーンに合わせて、shadow speechのテクニックを利用すると、効果的な練習が可能です。最初に、トランスクリプトを声に出して読み上げ、原音を注意深く聞きましょう。特に速いパートでは、発音を明瞭にするための意識が重要です。パターンを繰り返すことで、英語スピーキング練習の中で自分の発音を改善できます。
さらに、IELTS スピーキング対策としては、質問に対する自分の意見を述べる練習をすることが勧められます。内容を理解したら、自分の言葉で要約してみましょう。これにより、語彙力も増し、表現力が向上します。また、shadowspeaksを用いて他のリスナーと一緒に練習することも、スピーキング力を引き上げる助けになります。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。