Shadowing Practice: The Black Hole That Kills Galaxies - Quasars - Learn English Speaking with Video
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The universe looks like a vast empty ocean sprinkled with the rare islands of galaxies..
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But this is an illusion. Just a small fraction of all atoms are found in galaxies, while the rest is thought to be drifting in between, in the intergalactic medium.
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Like the roots of some massive tree, gas spreads out from each galaxy, gravity funneling fresh mass into this dense, cosmic forest.
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Here in the intergalactic medium, are the raw materials of creation: hydrogen and helium, woven into sheets and filaments that flow into galaxies where they eventually create stars.
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But if we look closely, we see who is actually in charge: Quasars, the single most powerful objects in existence. As small as a grain of sand compared to the amazon river, they reside in the centers of some galaxies, shining with the power of a trillion stars, blasting out huge jets of matter, completely reshaping the cosmos around them. They are so powerful that they can kill a galaxy.
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What are they, and how do they mold the structure of the universe at their whim?
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Everywhere You Look, Weird Things in the Sky In the 1950s astronomers noticed mysterious loud radio-waves coming from spots all over the sky. They were named “quasi-stellar radio sources”, or “quasars” because they were dots like stars, but were seen in radio waves rather than visible light.
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Everything about them was strange. Some flickered, others emitted high energy X-rays in addition to radio waves, but all seemed to be tiny. They also moved extremely fast, as much as over 30% the speed of light. The only explanation was that they must have been so distant that their apparent speed was actually the expansion of the universe moving them away from us.
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But these enormous distances meant that quasars couldn’t just be stars, but the active cores of galaxies billions of lightyears away! And it gets crazier. To appear so bright and loud, given these vast distances, they are thousands of times brighter than the entire Milky Way.
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Monsters, exploding and screaming into the void with a violence not thought possible before.
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As we mapped the sky, we discovered over a million quasars. And they all seemed to be very far away.
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Looking into space, far away means very long ago, because their light takes so long to reach us. Quasars were common in the early universe, having peaked in number 10 billion years ago when galaxies, and the universe itself was still very young.
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Let’s go back in time, just 3 billion years after the big bang and see what was going on back then.
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The Incredible Power of Quasars How could an early baby galaxy be so incredibly bright and violent?
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All that light and radiation couldn’t be stars, as there weren’t nearly enough of them. And since galaxies tend to grow with time by merging, the starlight from small galaxies shouldn’t be far brighter than any galaxy today.
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There’s only one way to generate the vast amounts of energy a quasar shines with: feeding supermassive black holes. We still don’t know how exactly they formed, but it seems that every galaxy has one in their center.
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But how can the brightest things in the universe be black holes, which trap anything and everything that crosses their event horizon?
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Well the light of a quasar is not coming from inside these black holes. Rather, it comes from the space around them, a massive orbiting disk of gas called an ‘accretion disk.’ Quasars use the same fuel as stars to shine: Matter. It is just that black holes are the most efficient engines for converting matter into energy in the universe.
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The energy released by matter falling into a black hole can be 60 times greater than that released by nuclear fusion in the core of a star. Because the energy released by a black hole comes from gravity, not from nuclear reactions.
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Matter falling into a black hole speeds up to almost the speed of light before it crosses the event horizon, buzzing with an incredible amount of kinetic energy. Of course, once inside the black hole, it takes that energy with it. You only get to witness this energy if you drop your matter in the right way. Fall straight down and the outside universe gets nothing. But when you have a lot of matter, it spirals in incredibly fast towards the event horizon forming a disk.
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Collisions between particles and friction heat it up to hundreds of thousands of degrees.
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In a space not much bigger than our solar system, the core of a galaxy can release many times more energy than all its stars combined.
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This is what a quasar is, a super massive black hole having a feast.
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And these black holes eat a lot. Typical quasars consume one to a hundred Earth masses of gas per minute! Ten billion years ago, the universe was about a third of its current size, so the intergalactic medium was much less spread out, meaning the filaments of gas around quasars could feed them a banquet, making them vomit insane amounts of light and radiation.
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The brightest quasars power jets, tangling the magnetic field of the matter around them into a narrow cone. Like a particle accelerator they launch enormous beams of matter out, plowing through the circumgalactic medium, forming plumes of matter that grow to hundreds of thousands of lightyears in size. It’s almost unfathomable in scale. A tiny spot in a galaxy carving out patches of the universe 100,000s of light years long.
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But quasars can’t eat for long, maybe a few million years, because their feast ultimately kills their galaxy.
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How Quasars Kill Galaxies Okay, maybe “killing” is a bit of an exaggeration. A galaxy is still there after its quasar turns off. But it will never be the same again. Quasars, being among the hottest and brightest things in the universe, break their galaxies by heating them up too much and stopping star formation.
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Hot gas cannot form stars. This sounds odd, because Stars are gas that collapsed in on itself and then got really hot. But in a cloud of gas that is already hot, atoms are moving quickly. When they collide, they hit hard, exerting pressure that resists gravity’s squeeze – so hot gas can’t form stars. Instead, the best gas for forming stars is already cold, and won’t put up a fight when it’s time to collapse into a star.
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On top of that, quasars push gas out of their galaxies. Not only does this starve the quasar, but its galaxy loses the raw materials for new stars.
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As sad as this sounds, it might be a good thing for life. The alternative can be far more dangerous: too many stars. New stars forming is usually followed by massive stars exploding in supernovae, so planets would be burned sterile.
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But of course it's more complicated. Like the intricacies of our own planet’s biosphere, every piece of the galaxy is dependent on and influencing every other part of the galactic environment. While hot things, like quasars and supernovae, tend to push gas out of the galaxy, shockwaves and quasar jets can also compress gas, making new stars at least for a short time. And gas that leaves will mix with gas coming back in and recycle it back into the galaxy. But in general we can say that without things becoming a bit more chill, we would not exist today. Which brings us to our final question: Did the Milky Way Have a Quasar in the Past?
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It’s unclear if every galaxy went through a quasar phase, but understanding distant quasars may provide clues to the history of the Milky Way. Galaxies don’t do a good job of preserving their history. Like sand on a beach the endless churning mixes away the clues to their past.
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It’s possible the Milky Way was once a quasar, which may have allowed our supermassive black hole Sagittarius A star to have grown to 4 million times the mass of the sun. But sadly we don’t know its ancient history.
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And as dormant as it is now, Sagittarius A star could turn into a quasar in the future. In a few billion years the Milky Way will merge with Andromeda. We’ve seen over a hundred ‘double quasars’ in galaxies smashing together, where fresh gas is provided for the central black holes.
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But it won’t last for long. When galaxies merge, so do their super massive black holes, sinking into the center of their new galaxy, kicking up dust and stars in every direction.
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We don’t know whether this will happen, but it would truly be an incredible sight. Maybe some beings in the far future are going to witness it and be in awe of what they see.
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But you don’t have to wait that long. There are already plenty of fascinating things to explore right here on this planet, right now – if you have the knowledge to understand them.
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To help you with that, we’ve created a series of lessons to take your scientific knowledge to the next level. Made in collaboration with our friends at Brilliant.org, these lessons give you a deeper understanding of the topics from our most popular videos, from rabies and mammalian metabolism, to climate science. There's also a lesson on black holes, where you can delve into the fundamental principles behind their formation and behavior. A deeper understanding will also help you appreciate their role in powering the quasars we talked about in this video.
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Brilliant is an interactive learning tool that makes math, science, and computer science accessible with a hands-on approach. Because we know that to really learn something, you’ve got to do it. Think of each lesson as a one-on-one tutoring version of a Kurzgesagt video.
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Brilliant has thousands of other lessons to explore, as well—from math-based topics like algebra and probability to courses around programming and data science.Their latest course, “How Technology Works,” takes you inside the technology you use everyday. You’ll walk in the footsteps of a hacker to discover why some passwords take decades to crack, explore how satellites in space know that your ride share driver is just down the street, learn why your favorite Kurzgesagt video might buffer on YouTube, and more.
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To get hands-on with Kurzgesagt lessons and explore everything Brilliant has to offer, you can start your free, 30-day trial by signing up at Brilliant.org/nutshell.
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There’s even an extra perk for Kurzgesagt viewers: the first 200 people to use the link get 20% off an annual membership once their trial ends.
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We love seeing how the gears interlock with our research – Brilliant gives you the tools to understand how everything fits together.
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Bu dersin kelimeleri ve konuşma notları
Bu C1 seviyesindeki konuşma dersi “The Black Hole That Kills Galaxies - Quasars” videosuna dayanıyor. En çok tekrarlanan kelimeler: quasar, star, galaxy, gas, galaxies. Bu videoda gölgeleme çalışması için 43 cümle ve 1798 kelime var. Konuşma bölümü 10:34 sürüyor. Konuşmacı dakikada yaklaşık 170 kelimeyle, günlük konuşmaya yakın doğal bir hızda konuşuyor. Kelimelerin yalnızca %79’i İngilizcede en sık kullanılan 3.000 kelime arasında, bu yüzden kelime dağarcığı zorlayıcı.
Bu videodaki önemli kelimeler
Videodaki en ileri düzey 15 kelime, telaffuzu ve anlamıyla:
| Kelime | Telaffuz | Anlam |
|---|---|---|
| quasar isim | /ˈkweɪ.zɑɹ/ | kuasar |
| merge fiil | /mɝd͡ʒ/ | birleştirmek, birleşmek |
| disk isim | /dɪsk/ | disk, ağırşak |
| horizon isim | /həˈɹaɪ.zən/ | ufuk, ufuk çizgisi |
| supernova isim | /ˌsuː.pə(ɹ)ˈnəʊ.və/ | süpernova |
| atom isim | /ˈætəm/ | atom |
| explode fiil | /ɪkˈsploʊd/ | patlamak |
| particle isim | /ˈpɑɹtək(ə)l/ | parçacık |
| feast isim | /ˈfiːst/ | şölen, toy |
| astronomer isim | /əˈstɹɒn.ə.mə/ | gök bilimci, astronom |
| exaggeration isim | /ɪɡˌzæd͡ʒəˈɹeɪʃən/ | abartı, mübalağa |
| footstep isim | /ˈfʊtstɛp/ | ayak izi |
| funnel isim | /ˈfʌnəl/ | huni |
| galactic sıfat | /ɡəˈlæktɪk/ | galaktik, galaksiyle alakalı/ilgili |
| helium isim | /ˈhiː.li.əm/ | helyum |
Duyacağınız deyimsel fiiller
| Kelime | Anlam |
|---|---|
| get off fiil | inmek |
| put up fiil | koymak |
| turn off fiil | kapamak |
Bu videodaki dil bilgisi
Konuşmacının en çok kullandığı yapılar, videodaki sözcüklerin aynısıyla:
| Yapı | Videoda |
|---|---|
| Edilgen yapı be + fiilin üçüncü hâli — kimin yaptığı değil, ne olduğu önemli | are found · were named · is usually followed |
| Present perfect have/has + fiilin üçüncü hâli — geçmişte olan ama şimdi de önemli olan bir eylem | We've seen · we've created |
Dikkat edilecek telaffuzlar
Konuşmacı don't, can't, couldn't gibi kısaltılmış biçimleri 17 kez kullanıyor. Bunları duyduğunuz gibi kısa söyleyin.
- “sh” ve “zh” sesleri: accretion /əˈkɹiʃən/, exaggeration /ɪɡˌzæd͡ʒəˈɹeɪʃən/, nutshell /ˈnʌt.ʃɛl/, reshape /ɹiːˈʃeɪ̯p/, friction /ˈfɹɪkʃən/
- Uzun kelimeler — vurguyu doğru yere koyun: supernova /ˌsuː.pə(ɹ)ˈnəʊ.və/, accelerator /əkˈsɛl.əˌɹeɪ.tɚ/, astronomer /əˈstɹɒn.ə.mə/, exaggeration /ɪɡˌzæd͡ʒəˈɹeɪʃən/, intricacy /ˈɪn.tɹɪ.kə.si/
Türkçe konuşanların zorlandığı sesler:
- /w/ — dudaklar yuvarlak, /v/ değil: quasar /ˈkweɪ.zɑɹ/, weave /wiːv/, banquet /ˈbæŋkwɪt/, squeeze /skwiːz/, password /ˈpæs.wɜɹd/
- Kelime başındaki ünsüz kümesi — araya ünlü eklemeyin: quasar /ˈkweɪ.zɑɹ/, flicker /ˈflɪkɚ/, sprinkle /ˈspɹɪŋkəl/, starlight /ˈstɑː(ɹ)laɪt/, sterile /ˈstɛɹəl/
- /æ/ — “e”den daha açık: atom /ˈætəm/, exaggeration /ɪɡˌzæd͡ʒəˈɹeɪʃən/, fascinate /ˈfæsɪneɪt/, galactic /ɡəˈlæktɪk/, tangle /ˈtæŋ.ɡəl/
Bu videoyla nasıl çalışılır
- Videonun tamamını konuşmadan bir kez dinleyin ve bilmediğiniz kelimeleri not edin.
- 0,75× hızla başlayın, cümle cümle tekrar edin ve kolaylaşınca normal hıza dönün.
- Kendinizi kaydedin ve orijinaliyle karşılaştırın; quasar, merge, disk gibi kelimelere özellikle dikkat edin.
Gölgeleme Tekniği Nedir?
Gölgeleme, başlangıçta profesyonel tercüman eğitimi için geliştirilen ve çok dilli Dr. Alexander Arguelles tarafından popüler hale getirilen, bilim destekli bir dil öğrenme tekniğidir. Yöntem basit ama güçlüdür: ana dili İngilizce olan bir sesi dinler ve hemen yüksek sesle tekrar edersiniz — konuşmacıyı 1-2 saniye gecikmeyle takip eden bir gölge gibi. Pasif dinleme veya dilbilgisi alıştırmalarının aksine, gölgeleme beyninizi ve ağız kaslarınızı gerçek konuşma kalıplarını eşzamanlı olarak işlemeye ve yeniden üretmeye zorlar. Araştırmalar, telaffuz doğruluğu, tonlama, ritim, bağlı konuşma, dinleme anlama ve konuşma akıcılığını önemli ölçüde geliştirdiğini göstermektedir — bu da onu IELTS Konuşma hazırlığı ve gerçek dünya İngilizce iletişimi için en etkili yöntemlerden biri yapar.