シャドーイング練習: Three Ways to Destroy the Universe - YouTubeで英語スピーキングを学ぶ
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One day the universe will die.
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One day the universe will die.
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But why? And how? And will the universe be dead forever?
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And how do we know that?
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First of all, the universe is expanding.
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And not only that, the rate of its expansion is accelerating.
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The reason: dark energy.
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Dark energy is a strange phenomenon that scientists believe permeates the universe.
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Until 1998 we thought that the universe must work a bit like a ball that you throw into the sky.
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The ball moves up, but at some point it has to come down again.
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But the expansion of the universe is actually speeding up.
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That’s like throwing a ball up and watching it fly away faster and faster and faster.
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Where is this acceleration coming from?
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Well, we don’t know, but we call it “dark energy”.
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Einstein thought of it first and then decided it was stupid.
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Now, astrophysicists have decided it is plausible.
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Trouble is, this is all very theoretical, and we don’t actually know what the properties of dark energy are.
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But there are various theories and they lead us to three scenarios for the end of the universe.
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One: the Big Rip.
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Since its birth, the universe has been expanding.
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For unknown reasons new spaces created everywhere equally.
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The space between galaxies expands, so they move apart.
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The space inside galaxies also expands, but here, gravity is strong enough to keep them together.
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In the Big Rip scenario, the expansion accelerates up to a point where space expands so fast that gravity can’t compensate for this effect anymore.
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The result is a Big Rip.
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At first, only large structures like galaxies are torn apart, since space between the single objects expands very fast.
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Next, big bodies like black holes, stars, and planets die.
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Their gravity isn’t strong enough to keep them together, so they dissolve into their components.
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In the end, space would expand faster than the speed of light.
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Atoms would now be affected, and they would just disband.
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Once space is expanding faster than light, no particle in the universe can interact with any other particle anymore.
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The universe would dissolve into countless lonely particles that won’t be able to touch anything else in a strange, timeless universe.
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Hmm, and you thought you felt lonely!
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Two: Heat death or a Big Freeze.
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In a nutshell, the difference between the Big Rip and heat death is that in a heat death scenario matter stays intact and is converted over an incredibly long but finite period of time into radiation, while the universe expands forever.
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But how does this work? Let’s talk about entropy.
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Every system tends towards the state of highest entropy, like when we have a latte macchiato.
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Initially, it has different regions, but over time, they will cool down and disintegrate, until it’s uniform.
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And this also applies to the universe.
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So, while the universe gets bigger and bigger, matters slowly decays and spreads out.
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At some point, after lots of generations of stars, all the gas clouds necessary to form stars will be exhausted, so the universe will turn dark.
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The remaining suns will die; black holes will slowly degenerate and evaporate over trillions of years due to what’s known as Hawking radiation.
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When this process is complete, only a dilute gas of photons and light particles remains, until even this decays.
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All activity in the universe ceases at this point; entropy is at its maximum and the universe is dead forever.
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Unless… theoretically, it might be possible that after an incredibly long amount of time, there might be a spontaneous entropy decrease as a result of something called “quantum tunneling”, leading to a new Big Bang.
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Three: Big Crunch and Big Bounce.
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This is the most uplifting scenario.
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If there is less dark energy than we think or it decreases over time, gravity will be the dominating force in the universe one day.
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In a few trillion years, the rate of expansion of the universe will slow down and stop.
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After that, it reverses.
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Galaxies will race at each other, merging as the universe becomes smaller and smaller.
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Since a smaller universe also means a hotter universe, temperatures rise everywhere all at once.
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One hundred thousand years before the Big Crunch, background radiation would be hotter than the surfaces of the most stars, which means that they would be cooked from the outside.
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Minutes before the Big Crunch happens, atom cores are ripped apart, before supermassive black holes devour everything.
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Finally, all black holes would emerge into a supermassive mega-black hole that contains the entire mass of the universe, and in the last moment before the Big Crunch it would devour the universe, including itself.
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The Big Bounce theory states that this has happened a lot of times and that the universe goes through an infinite cycle of expansion and contraction.
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Well, wouldn’t that be nice?
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So what will actually happen to the universe in the end?
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At the moment, heat death seems the most likely, but we at Kurzgesagt hope that this “dead forever” stuff is wrong and the universe will start over and over again.
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We don't know for sure either way, so let’s just assume the most uplifting theory is true.
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By the way, we have a Twitter account.
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Subtitles by the Amara.org community
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このレッスンについて
このレッスンでは、宇宙の終焉に関する3つのシナリオについて学びます。暗黒エネルギーや宇宙の膨張の速度の加速についての理解を深めることができるでしょう。また、会話の中で出てくる英語のフレーズや用語を通じて、リスニングやスピーキングのスキルを向上させる練習も行います。特に、声に出して発音することで、英語の発音を良くするための効果的な方法を体験しましょう。このトピックは異なる視点を提供し、あなたの語彙を増やす手助けとなります。
重要な語彙とフレーズ
- 暗黒エネルギー (dark energy)
- 宇宙の膨張 (expansion of the universe)
- ビッグリップ (Big Rip)
- 熱的死 (heat death)
- ビッグクランチ (Big Crunch)
- エントロピー (entropy)
- ホーキング放射 (Hawking radiation)
- 量子トンネル効果 (quantum tunneling)
練習のコツ
このビデオのように複雑なトピックを学ぶ際には、shadowing siteを活用することが非常に有効です。声に出して発音しながら、話者の速度やトーンに合わせることで、より自然な英語のリズムを身につけることができます。ビデオのスピードは中程度ですが、しっかりとした理解を助けるためにはまずはゆっくりと練習し、その後でスピードを上げてみると良いでしょう。特に、shadow speechやshadow speakの練習を通じて、耳で聞くだけでなく体全体を使って覚えていくことが大切です。
特定のフレーズを繰り返すことが、英語の発音を良くするための鍵となります。音声を聞きながら、メモを取ることも忘れずに。最初は難しいかもしれませんが、続けることであなたの発音力がじわじわと向上していくのを感じることでしょう。実際に声に出してみて、自分の成長を楽しんでください。
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。