シャドーイング練習: The Last Star in the Universe – Red Dwarfs Explained - 動画で英語スピーキングを学ぶ
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One day the last star will die and the universe will turn dark forever.
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It will probably be a red dwarf, a tiny kind of star that's also one of our best bets to find alien life
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and might be the last home of humanity before the universe becomes uninhabitable.
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So what do we know about them and why are they our last hope?
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At least 70% of stars in the universe are red dwarfs.
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They are the tiniest stars out there, with only about 7-50% of the mass of our Sun.
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Not that much bigger than our planet Jupiter, which is still huge though.
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They are also very dim.
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It's impossible to see them with the naked eye.
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You've never seen one in the night sky.
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Even with all our technology, we can only clearly observe red dwarfs in our neighborhood.
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Approximately 20 of the 30 stars close to Earth are red dwarfs.
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Like all stars, red dwarfs fuse hydrogen into helium.
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But while more massive stars accumulate all the fuse helium in their cores, red dwarfs stay convective, meaning that the helium and hydrogen constantly mix.
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So they use up their fuel incredibly slowly before they're extinguished.
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Red dwarfs burn so slowly that their average lifespan is between 1 and 10 trillion years.
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By comparison, the Sun will survive for another 5 billion years.
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Because the universe is only 13.75 billion years old, not a single red dwarf has reached later development stages.
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Every single one of the trillions that exist is still a baby.
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Speaking of babies, the smallest star in the entire universe is also a red dwarf, because small red dwarfs are right on the verge of being a star at all,
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just a tiny bit less hydrogen, and they are mere brown dwarfs, failed stars that cannot sustain a fusion reaction for long.
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So what about aliens, or a new home for humanity?
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Since our sun will die one day, we'll eventually need to look for a new home.
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And where there are habitable planets, there might also be aliens.
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The Kepler Space Observatory found
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that at least half of all red dwarfs host rock planets between half and four times the mass of our Earth.
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Many of them are in the habitable zone, the area around a star where water can be liquid.
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But since red dwarfs burn at relatively cold temperatures, a planet would need to be really close to be hospitable, probably as close as Mercury to our Sun, or even closer.
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Which brings with it all kinds of problems.
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For example, a planet this close to a star would probably be tidally locked, meaning the same side would always face it.
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This side would be incredibly hot, while the shadow side would be frozen, which makes it hard for life to develop.
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Although a planet with a big enough ocean might be able to distribute the star's energy and create some kind of stability.
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All the gravitational forces of the red dwarf could squeeze the planet
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and heat it up so much that it might lose all its water over time.
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These planets could end up like Venus, a hot, burning hell.
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Another problem is that many red dwarfs vary in their energy output.
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They can be covered in star spots that can dim their emitted light by up to 40% for months, which would cause oceans on planets to freeze over.
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At other times they can emit powerful solar flares, sudden outbursts of energy incredibly powerful.
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These red dwarfs can double their brightness in minutes, which could strip away sizeable portions of a planet's atmosphere and burn it, rendering it sterile.
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On the other hand, their extremely long lifespan is a big plus.
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A red dwarf with just moderate levels of activity could be an amazing place for a planet that hosts life.
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Life on Earth has existed for about 4 billion years, and we have about a billion years left before the Sun becomes so hot that complex life on Earth will become impossible.
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We will either die out or leave Earth and look for a new home.
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We could build a civilization for potentially trillions of years around a red dwarf with the right conditions.
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About 5% of the red dwarfs in the Milky Way may host habitable, roughly Earth-sized planets.
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That would be more than 4 billion in total.
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But life may not even need a planet like Earth.
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Candidates for life around a red dwarf may be the moons of gas giants or so called super earths, really massive rocky planets.
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All in all there are an estimated 60 billion potentially habitable planets around red dwarfs and that's in the Milky Way alone.
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So red dwarfs might become really important for our survival in the future.
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But everything has to die at some point, even red dwarfs.
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When in trillions of years the life of the last red dwarf in the universe is about to end, it will not be a very spectacular event.
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As its hydrogen runs out it shrinks, becoming a blue dwarf burning out completely.
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After its fuel is spent, it's transformed into a white dwarf, an object about as small as Earth,
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packed very densely and made of degenerate gases, mostly of helium-4 nuclei.
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no more source of energy, it will cool extremely slowly over trillions of years until it becomes its final form, a cold, black dwarf.
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White and black dwarfs are so fascinating that they deserve their own video.
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Anyway, it's going to be a long time before the last stars in the universe vanish.
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It's kind of uplifting to know that if humanity succeeds in venturing into space, we have plenty of time before the universe turns out the lights.
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Our videos are made thanks to your support on Patreon.com.
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If you want to help us make more of them, we really appreciate your support.
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このレッスンの語彙とスピーキングのポイント
このC1レベルのスピーキングレッスンは、動画「The Last Star in the Universe – Red Dwarfs Explained」を教材にしています。 繰り返し出てくる語は次のとおりです：dwarf, planet, star, Earth, universe。 この動画には、シャドーイング用の文が61文、単語が976語あります。 音声の長さは5:45です。 話す速さは1分あたり約170語で、日常会話に近い自然なペースです。 単語の82%は英語の頻出3,000語に含まれます。残りは練習の前に確認しておきましょう。
この動画の重要語彙
動画の中で特に難しい単語15語を、発音と意味つきで紹介します。
| 単語 | 発音 | 意味 |
|---|---|---|
| helium 名詞 | /ˈhiː.li.əm/ | ヘリウム |
| hydrogen 名詞 | /ˈhaɪdɹəd͡ʒ(ə)n/ | 水素 |
| emit 動詞 | /iˈmɪt/ | 放つ, 放射する |
| fuse 名詞 | /fjuːz/ | 導火線 |
| accumulate 動詞 | /əˈkjuːmjʊˌleɪt/ | 積む |
| extinguish 動詞 | /ɪkˈstɪŋ.ɡwɪʃ/ | 消す, 鎮火する |
| fascinate 動詞 | /ˈfæsɪneɪt/ | 魅惑する |
| hospitable 形容詞 | /hɑsˈpɪtəbl̩/ | もてなしのよい |
| sterile 形容詞 | /ˈstɛɹəl/ | 不毛な, 不妊の |
| vanish 動詞 | /ˈvænɪʃ/ | 消える |
| brightness 名詞 | /ˈbɹaɪtnəs/ | 明るさ |
| nucleus 名詞 | /ˈnuː.kli.əs/ | 核, 核心 |
| distribute 動詞 | /dɪˈstɹɪbjuːt/ | 分ける |
| squeeze 動詞 | /skwiːz/ | 押す, 締め付ける |
| civilization 名詞 | /ˌsɪv.ɪ.laɪˈzeɪ.ʃən/ | 文明 |
動画に出てくる句動詞
| 単語 | 意味 |
|---|---|
| die out 動詞 | 死に絶える |
この動画の文法
話し手がよく使っている文型を、動画の実際の表現とともに紹介します。
| 文型 | 動画での表現 |
|---|---|
| 受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てる | would be frozen · can be covered · is spent |
| 現在完了形 have/has + 過去分詞 — 過去の出来事が今も関係している | You've never seen · has reached · has existed |
| 関係詞節 who / which + 節 — 人や物について情報を加える | Jupiter, which is · frozen, which makes |
注意したい発音
話し手はthey're, we'll, you'veなど、短縮形や弱形を3回使っています。聞こえたとおりの短い形で発音しましょう。
- 「sh」と「zh」の音: extinguish /ɪkˈstɪŋ.ɡwɪʃ/, gravitational /ˌɡɹævɪˈteɪʃənəl/, vanish /ˈvænɪʃ/, civilization /ˌsɪv.ɪ.laɪˈzeɪ.ʃən/, fusion /ˈfjuː.ʒən/
- 長い単語（アクセントの位置に注意）: habitable /ˈhæbɪtəbəl/, accumulate /əˈkjuːmjʊˌleɪt/, degenerate /dɪˈd͡ʒɛnəɹɪt/, gravitational /ˌɡɹævɪˈteɪʃənəl/, uninhabitable /ˌʌnɪnˈhæbɪtəbəl/
日本語話者が苦手な音：
- /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: gravitational /ˌɡɹævɪˈteɪʃənəl/, sterile /ˈstɛɹəl/
- /v/ — /b/ にならないように、上の歯を下唇に当てる: convective /kənˈvɛk.tɪv/, gravitational /ˌɡɹævɪˈteɪʃənəl/, vanish /ˈvænɪʃ/, verge /vɜːd͡ʒ/, civilization /ˌsɪv.ɪ.laɪˈzeɪ.ʃən/
- /f/ — 「フ」ではなく、上の歯と下唇で出す: lifespan /ˈlaɪf.spæn/, fuse /fjuːz/, fascinate /ˈfæsɪneɪt/, flare /flɛɚ̯/, fusion /ˈfjuː.ʒən/
この動画での練習方法
- まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
- まず0.75倍速で一文ずつシャドーイングし、慣れてきたら通常の速度に戻します。
- 自分の声を録音して元の音声と比べます。helium, hydrogen, emitなどの単語に特に注意しましょう。
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。