Pratique du Shadowing: The Beginning of Everything -- The Big Bang - Apprendre l'anglais à l'oral avec la vidéo
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The beginning of everything, the Big Bang.
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The idea that the universe was suddenly born and is not infinite.
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Up to the middle of the 20th century, most scientists thought of the universe as infinite and ageless.
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Until Einstein's theory of relativity gave us a better understanding of gravity
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and Edwin Hubble discovered that galaxies are moving apart from one another in a way that fits previous predictions.
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In 1964, by accident, cosmic background radiation was discovered, a relic of the early universe,
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which together with other observational evidence made the Big Bang the accepted theory in science.
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Since then, improved technology like the Hubble telescope has given us a pretty good picture of the Big Bang
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and the structure of the cosmos.
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Recent observations even seem to suggest that
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The expansion of the universe is accelerating.
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But how did this
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Big Bang work?
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How can something come from nothing?
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Let's explore what we know.
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We can ignore the beginning part for now.
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First of all, the Big Bang was not an explosion.
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It was all space, stretching everywhere, all at once.
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The universe started very, very, very small and quickly expanded to the size of a football.
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The universe didn't expand into anything, space was just expanding into itself.
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The universe cannot expand into anything because the universe has no borders, there is by definition no outside the universe.
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The universe is all there is.
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In this hot, dense environment, energy manifested itself in particles that existed only for the tiniest glimpses of time.
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From gluons, pairs of quarks were created, which destroyed one another, perhaps after giving off more gluons.
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These found other short -lived quarks to interact with, forming new quark pairs and gluons again.
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Matter and energy were not just theoretically equivalent, it was so hot, they were practically the same stuff.
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Somewhere around this time, matter won over antimatter.
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Today, we're left with almost all matter and nearly no antimatter at all.
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Somehow, 1 billion and 1 matter particles were formed for every 1 billion particles of antimatter.
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Instead of one massive ultimate force in the universe, there were now several refined versions of it acting under different rules.
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By now, the universe has stretched to a billion kilometers in diameter, which leads to a decrease in temperature.
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The cycle of quarks being born and converted back to energy suddenly stops.
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From now on we work with what we have.
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Quarks begin forming new particles, hadrons, like protons and neutrons.
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There are many many combinations of quarks that can form all sorts of hadrons
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but only very few are reasonably stable for any length of time.
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Please take a moment to appreciate that by now only one second has passed since the beginning of everything.
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The universe
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which has grown to 100 billion kilometers is now cold enough
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to allow most of the neutrons to decay into protons
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and form the first atom hydrogen imagine the universe at this
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point as an extremely hot soup 10 billion degrees celsius filled with countless particles
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and energy over the next few minutes things cooled
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and settled down very fast atoms formed out of hadrons and electrons making for a stable and electrically neutral environment.
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Some call this period the Dark Age because there were no stars
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and the hydrogen gas didn't allow visible light to move around.
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But what's the meaning of visible light anyway when there's nothing alive yet that could have eyes?
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When the hydrogen gas clumped together after millions of years and gravity put it under great pressure, stars and galaxies began to form.
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Their radiation dissolved the stable hydrogen gas into a plasma that still permeates the universe today and allows visible light to pass.
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Finally, there was light.
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Okay, but what about the part we didn't talk about?
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What happened right at the beginning?
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This part can be defined as the Big Bang.
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We don't know at all what happened here.
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At this point, our tools break down.
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Natural laws stop making sense.
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Time itself becomes wibbly -wobbly.
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To understand what happened here, we need a theory that unifies Einstein's relativity and quantum mechanics, something countless scientists are working on right now.
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But this leaves us with lots of unanswered questions.
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Were there universes before our own?
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Is this the first and only universe?
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What started the Big Bang?
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Or did it just occur naturally based on laws we don't understand yet?
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We don't know, and maybe we never will.
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But what we do know is that the universe as we know it started here and gave birth to particles,
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galaxies, stars, the Earth and you.
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Since we ourselves are made of dead stars, we are not separate from the universe.
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We are part of it.
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You could even say that we are the universe's way of experiencing itself.
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So let's keep on experiencing it until there are no more questions to ask.
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Thank you.
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale s’appuie sur la vidéo « The Beginning of Everything -- The Big Bang ». Les mots qui reviennent le plus souvent : universe, Bang, quark, particles, billion. Cette vidéo contient 58 phrases et 827 mots à répéter en shadowing. La partie parlée dure 5:54. Le locuteur parle à un rythme régulier d’environ 140 mots par minute, confortable pour le shadowing. 82 % des mots font partie des 3 000 mots les plus courants en anglais ; le reste mérite d’être vu avant de commencer.
Vocabulaire clé de cette vidéo
15 mots de la vidéo à retenir, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| particle nom | /ˈpɑɹtək(ə)l/ | particule |
| expand verbe | /ɪkˈspænd/ | agrandir |
| hydrogen nom | /ˈhaɪdɹəd͡ʒ(ə)n/ | hydrogène |
| stable nom | /ˈsteɪ.bəl/ | étable, écurie |
| visible adjectif | /ˈvɪzɪb(ə)l/ | visible |
| galaxy nom | /ˈɡæl.ək.si/ | galaxie |
| discover verbe | /dɪˈskʌvə/ | découvrir |
| stretch verbe | /stɹɛt͡ʃ/ | étirer, étendre |
| radiation nom | /ˌɹeɪ.diˈeɪ.ʃən/ | radiation |
| gravity nom | /ˈɡɹævɪti/ | gravité |
| scientist nom | /ˈsaɪəntəst/ | scientifique, savant |
| infinite adjectif | /ˈɪnfɪnɪt/ | infini |
| countless adjectif | /ˈkaʊntləs/ | incalculable, innombrable |
| atom nom | /ˈætəm/ | atome |
| ignore verbe | /ɪɡˈnɔː/ | ignorer, ne pas prêter attention à |
Les verbes à particule que vous entendrez
| Mot | Prononciation | Sens |
|---|---|---|
| break down verbe | tomber en panne | |
| give off verbe | /ɡɪv ɒf/ | émettre |
| settle down verbe | s'installer |
Des phrases à répéter
Des phrases courtes et complètes de la vidéo, à réutiliser dans la conversation de tous les jours :
- Let’s explore what we know.
- We don’t know at all what happened here.
- Were there universes before our own?
- We don’t know, and maybe we never will.
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | was discovered · were created · were formed |
| Present perfect have/has + participe passé — une action passée qui compte encore maintenant | has given · has stretched · has passed |
Prononciation à surveiller
Le locuteur utilise 7 contractions et formes réduites, comme didn't, don't, we're. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Les sons « sh » et « zh »: radiation /ˌɹeɪ.diˈeɪ.ʃən/, explosion /ɛkˈsploʊ.ʒən/, observation /ˌɑbzɚˈveɪʃn̩/, prediction /pɹɪˈdɪkʃən/, combinations /kɑmbɪˈneɪʃənz/
- Mots longs — placez bien l’accent: radiation /ˌɹeɪ.diˈeɪ.ʃən/, naturally /ˈnæt͡ʃ.(ə.)ɹə.li/, practically /ˈpɹæk.tɪ.k(ə.)li/, diameter /daɪˈæmɪdɚ/, reasonably /ˈɹiː.zən.ə.bli/
Les sons difficiles pour les francophones :
- /h/ — il se souffle, il n’est pas muet: hydrogen /ˈhaɪdɹəd͡ʒ(ə)n/, hadron /ˈhæd.ɹɑn/
- /tʃ/ et /dʒ/ — à ne pas adoucir en « ch » et « j »: hydrogen /ˈhaɪdɹəd͡ʒ(ə)n/, stretch /stɹɛt͡ʃ/, naturally /ˈnæt͡ʃ.(ə.)ɹə.li/
- /r/ anglais — langue recourbée, sans frotter la gorge: particle /ˈpɑɹtək(ə)l/, hydrogen /ˈhaɪdɹəd͡ʒ(ə)n/, stretch /stɹɛt͡ʃ/, radiation /ˌɹeɪ.diˈeɪ.ʃən/, gravity /ˈɡɹævɪti/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Répétez phrase par phrase à vitesse normale, en reprenant chacune jusqu’à ce que votre rythme corresponde à celui du locuteur.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme particle, expand, hydrogen.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.