Pratique du Shadowing: What is the universe made of? - Dennis Wildfogel - Apprendre l'anglais à l'oral avec YouTube

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All the material objects around you are composed of submicroscopic units we call molecules.
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All the material objects around you are composed of submicroscopic units we call molecules.
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And molecules in turn are composed of individual atoms.
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Molecules frequently break apart and then form new molecules.
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On the other hand, virtually all the atoms you come in to contact with through the course of your life, the ones in the ground beneath you, the air you breath, the food you eat, those that make up every living thing, including you, have existed for billions of years and were created in places very unlike our planet.
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How those atoms came about is what I want to share with you.
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It all started 14 billion years ago with an event we call The Big Bang, which resulted in a universe consisting of gas alone.
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There were no stars and no planets.
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The gas was made up only of atoms belonging to the simplest elements.
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It was about 75 percent hydrogen and almost all the rest was helium.
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No elements like carbon, oxygen or nitrogen existed.
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No iron, silver or gold.
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In some places, the density of this gas was slightly higher than in others.
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Due to gravity, those places attracted even more gas, which further strengthened the pull of gravity, which then drew more gas in, and so on.
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Eventually, large dense gas balls formed, shrinking under their own gravity and consequently heating up on the inside.
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At some point, the core of such a ball gets hot enough that nuclear fusion occurs.
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Hydrogen atoms smash together to form helium, accompanied by a great release of energy, strong enough to counteract the shrinking force of the gravity.
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When the energy pushing out from the fusion reactions matches the gravity pulling all the gas inwards, an equilibrium occurs.
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From this a star is born.
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Over its lifetime, the fusion reactions in the core of a massive star will produce not only helium, but also carbon, oxygen, nitrogen and all the other elements in the periodic table up to iron.
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But eventually, the core's fuel runs out, leaving it to collapse completely.
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That causes an unbelievably powerful explosion we call a supernova.
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Now there are two things to note about how supernovas create elements.
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First, this explosion releases so much energy that fusion goes wild forming elements with atoms even heavier than iron like silver, gold and uranium.
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Second, all the elements that had been accumulating in the core of the star, like carbon, oxygen, nitrogen, iron, as well as all of those formed in the supernova explosion, are ejected in to interstellar space where they mix with the gas that's already there.
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History then repeats itself.
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Gas clouds, now containing many elements besides the original hydrogen and helium, have higher density areas that attract more matter, and so on.
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As before, new stars result.
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Our sun was born this way about 5 billion years ago.
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That means that the gas it arose from had itself been enriched with many elements from supernova explosions since the universe began.
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So that's how the sun wound up with all the elements.
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It's still mostly hydrogen at 71 percent, with most of the rest being helium at 27 percent.
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But bear in mind that while the first stars were made up of hydrogen and helium alone, the remaining elements in the periodic table make up two percent of the sun.
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And what about Earth?
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Planets form as an incidental process to star formation out of the same gas cloud as the star itself.
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Small planets like ours don't have enough gravity to hold on to much hydrogen or helium gas since both of those are very light.
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So, even though carbon, nitrogen, oxygen and so on made up only two percent of the gas cloud from which Earth was formed, these heavier elements form the bulk of our planet and everything on it.
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Think about this: with the exception of hydrogen and some helium, the ground you walk on, the air you breath, you, everything is made of atoms that were created inside stars.
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When scientists first worked this out over the first half of the 20th Century, the famous astronomer Harlow Shapley commented, "We are brothers of the boulders, cousins of the clouds."
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About This Lesson

In this lesson, you will practice your English speaking skills by exploring the fascinating topic of the universe's composition as discussed by Dennis Wildfogel. You'll learn about atoms, molecules, stars, and the creation of elements through cosmic events. By the end of this session, you will enhance your vocabulary, improve your pronunciation, and develop a deeper understanding of scientific concepts—all while practicing your English. This is a unique opportunity to learn English with YouTube while engaging with content that stimulates both your mind and language skills.

Key Vocabulary & Phrases

  • Molecules - the fundamental units of matter, composed of atoms.
  • Atoms - the basic building blocks of all matter, previously linked to the history of the universe.
  • Big Bang - the event marking the beginning of the universe, consisting primarily of hydrogen and helium.
  • Nuclear fusion - the process by which stars generate energy by fusing hydrogen atoms into helium.
  • Supernova - an astronomical explosion that occurs at the end of a star's life, producing heavy elements.
  • Interstellar space - the region between stars in a galaxy where various gases and elements can be found.
  • Elements - substances that cannot be broken down into simpler substances, including oxygen, carbon, and nitrogen.
  • Gravity - the force that attracts two bodies towards each other, crucial for star and planet formation.

Practice Tips

To effectively improve your speaking skills through shadowspeaking, consider the following tips while watching this video:

  • Go slow: Start by listening to each sentence at a normal speed. Try to catch the intonation and pronunciation before you begin mimicking.
  • Repeat frequently: Practice shadow speech by repeating phrases right after you hear them. This helps reinforce your memory and improves fluency.
  • Focus on rhythm: Pay attention to how Dennis Wildfogel emphasizes certain words. Mimicking his rhythm will aid in making your speech sound more natural.
  • Record yourself: Use a recording device to capture your shadowing practice. Listening to your voice can help you identify areas for improvement in pronunciation.
  • Engage with visuals: Refer to visuals or diagrams in the video to better understand the scientific concepts discussed. This can enhance comprehension and retention.

By integrating these tips into your practice, you will not only master the vocabulary related to cosmology but also elevate your overall English speaking proficiency.

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.

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