Death of Stars - Walter Lewin

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  • Опубликовано: 8 янв 2014
  • Source - serious-science.org/videos/62
    Physicist Walter Lewin on energy from the Sun, black holes, and supernova explosion.
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Комментарии • 136

  • @Gabaruga
    @Gabaruga 10 лет назад +93

    Such a great man. It hurts to watch how old is he now.

    • @lecturesbywalterlewin.they9259
      @lecturesbywalterlewin.they9259 9 лет назад +61

      next year I will be 80. I will give this year 8 more lectures in Europe!

    • @Gabaruga
      @Gabaruga 9 лет назад +22

      Lectures by Walter Lewin. They will make you ♥ Physics. It's an honor to have a reply from you, Prof. Wow.
      Thank you very much for the great stuff, you've done.
      Live long and prosper!

    • @lecturesbywalterlewin.they9259
      @lecturesbywalterlewin.they9259 9 лет назад +17

      Gabaruga Thank you
      \\/\///////////

    • @shchpendrop
      @shchpendrop 8 лет назад +2

      +Lectures by Walter Lewin. They will make you ♥ Physics. Awesome! Will those lectures be available online?

    • @VeganSemihCyprus33
      @VeganSemihCyprus33 7 лет назад +2

      +Gabaruga He doesn't sound old, I think this is the important thing :D

  • @DaytakTV
    @DaytakTV 9 лет назад +28

    My favorite professor!!!

  • @StaticBlaster
    @StaticBlaster 2 года назад +1

    I first discovered Walter Lewin years ago in the summer or spring of 2008- 2010. One of those three years in the MIT opencourseware videos. I wish this guy could live forever. He's one of the most effervescent, passionate physicists I've come across. I've learned more from him than all of my physics college professors combined.

  • @ekalavyain1131
    @ekalavyain1131 5 лет назад +8

    Nobel prize for the best teacher category physics.Nominees are Richard feynman and walter lewin.

  • @pakistanigodam5149
    @pakistanigodam5149 6 лет назад +31

    Professor you deserve Noble prize.

  • @walterlewin85
    @walterlewin85 4 года назад +2

    Thanks for the interview!

  • @ajitreddy2382
    @ajitreddy2382 3 года назад +3

    He makes u see supernova infront of u with his explanations!! Such a great man

  • @Intrafacial86
    @Intrafacial86 9 лет назад +52

    When I read "Death of Stars" my first thought was "OH SHIT HE DIED?!? WTF!!!"
    Then I realized we were talking about literal stars.

    • @lecturesbywalterlewin.they9259
      @lecturesbywalterlewin.they9259 9 лет назад +16

      luckily I didn't die, at least not yet.

    • @lecturesbywalterlewin.they9259
      @lecturesbywalterlewin.they9259 9 лет назад +10

      ha ha ha

    • @lecturesbywalterlewin.they9259
      @lecturesbywalterlewin.they9259 9 лет назад +13

      Thank you

    • @geezy218
      @geezy218 9 лет назад +7

      Lectures by Walter Lewin. They will make you ♥ Physics. Omg this can't be the real Walter Lewin. If it is really you, WE LOOOOOVE YOUUUU. Best teacher I ever had and I get it free on the net. Amazing how I sit and watch your videos and tell to myself ; well, first line free for MIT courses, pretty neat uhhh. Free and more than able to understand your explanations. Platonian philosophie :) Keep the legend up. I think you are getting used to that legendary thing :)

    • @spiralgaming8940
      @spiralgaming8940 4 года назад +1

      @@lecturesbywalterlewin.they9259 legends never die sir 😊😊😊

  • @dougspurell2387
    @dougspurell2387 8 лет назад +4

    Wow Walter Lewin, what an amazing, shining gift you continue to be for Physics, for MIT, and to the many thousands of fans, who, thanks to you, love physics.

  • @oracleofottawa
    @oracleofottawa 9 лет назад +3

    By far the best explanation of the death of stars on the University of You Tube. Love the mans conviction on his subject, and he has the rarest gift of transmitting that passion. That is the true greatness of the man.

  • @zvpunry1971
    @zvpunry1971 5 лет назад +9

    1:08 And now I know how it sounds when a star is born. :)

  • @maryammanzoor2267
    @maryammanzoor2267 4 года назад

    look at how happy he is talking about this, it gives me so much motivation and drive to learn more

  • @jacksonsmith8554
    @jacksonsmith8554 9 лет назад +5

    Wow amazing! I was always interested in astronomy. I wish there were more lectures by this professor on the subject

  • @VegasNit
    @VegasNit 5 лет назад

    This should be taught daily to our younger generations, such underrated yet essential knowledge.

  • @MATHEKANAL
    @MATHEKANAL 4 года назад

    I have worked through Walters Physics 8.01-8.03 lectures back when they first became avaiable on OCW in the early two thousands. He is easily one the best physics educators i have ever seen. 👍

  • @samarattia7347
    @samarattia7347 3 года назад

    I fall in love with physics since I have watched your lectures. I am watching your lectures by hours professor , i don't feel the time . May be it's a part of Einestin theory . Time is constant with your lectures professor

  • @tuckasamms
    @tuckasamms 4 года назад

    Absolutely brilliant- just couldn't stop listening
    Feel blessed just to listen to such an awesome genius.

  • @m.muthupalaniyappan.7842
    @m.muthupalaniyappan.7842 7 лет назад +3

    hi sir, good night.... it's 22.45(10.45pm) is the time here in India,
    Just now I seen your video so I think I will not go to sleep for another half an hour....
    (Thanks for giving reply to all our messages...you are simply awesome & thanks to God/Physics for having you..)

  • @leszekwalinowicz5795
    @leszekwalinowicz5795 5 лет назад +1

    Dzięki wykładom profesora Lewina, zmieniłem swoje spojrzenie na świat. Choć dalej Świat jest dla mnie pojęciem nieogarniętym.

  • @danondler8808
    @danondler8808 3 года назад +1

    Walter was born to teach. He is such a gift.

  • @VinayChembil
    @VinayChembil 3 года назад

    His Passion says it all. Such an incredible person.

  • @scroxydrums
    @scroxydrums 7 лет назад +6

    That's just ENORMOUS!!

  • @scanurasiri1
    @scanurasiri1 5 лет назад

    I want to listen to him for hours never feel tired

  • @soroushm9820
    @soroushm9820 7 лет назад +8

    my favorite human

  • @trungac2414
    @trungac2414 5 лет назад

    Thanks you Professor Walter Lewin. You are the best

  • @dinysanchez
    @dinysanchez 4 года назад

    He is the best physics teacher I ever had, even tho I have never physically sit in any of his classes. :)

  • @trungac2414
    @trungac2414 6 лет назад

    Thanks for your knowledge

  • @rijumukherjee5409
    @rijumukherjee5409 7 лет назад

    Sir it is brilliant a bright topic and a brilliant discussion. I also have some idea in mind I have been thinking about the presence of dark matter and energy which I want to share with you.Though my thought will be a little lame one but I believe you will be thoughtfull after reading my thoughts.

  • @bmw1553
    @bmw1553 4 года назад

    Setting the foundational knowledge on Physics in the key for exploration. I wish the young kids gets a teacher like Walter. If so, I'm pretty confident that one such kid will find what Dark matter and Dark Energy. I wish you live long healthy to see that kid win Nobel prize.

  • @samarattia7347
    @samarattia7347 3 года назад

    You are a great professor Dr Walter . a lot of Nobel genius stars had been born by your lectures . Congratulations to Dr Andrea ghez for Nobel prize in physics 2020

  • @user-js5vi9vg7e
    @user-js5vi9vg7e 5 лет назад

    Sir lf the higgs boson from a black hole is again converting in to a new star by using the large quantity energy , then how is the universe still expanding.

  • @itsiwhatitsi
    @itsiwhatitsi 5 лет назад +2

    Walter Lewin The Legend

  • @naisot2174
    @naisot2174 7 лет назад

    one of the greatest physicists of the 20th century.

  • @RanjeetSingh-pp1tu
    @RanjeetSingh-pp1tu 6 лет назад

    sir please make video on gravitational waves discovery

  • @zosimus_99
    @zosimus_99 4 года назад

    Thanks to all.

  • @kumkumpandey4377
    @kumkumpandey4377 3 года назад

    We need more teachers like him to explore the universe

  • @shikhachaudhary5152
    @shikhachaudhary5152 4 года назад +1

    I have written theory would you help me?

  • @abcdef2069
    @abcdef2069 7 лет назад

    after super nova to become a neutron star, what is the star mass ratio before and after?
    after super nova to become a blackhole, what is the star mass ratio before and after?
    how much gets to be sucked in and how much gets ejected?
    what is the becoming neutron star's implosion time lapse?
    what is the becoming blackhole's implosion time lapse? at lesst i heard, 10 sec to 100's second gamma ray burst then the real implosion,.
    where do all the W+ bosons come from all of sudden to become a neutron star, in which W+'s are the hardest to make in a normal star? all the anti neutrinos just come out of nowhere? are we saying we dont know because quantum mech and general relativity do not communicate? so it gotta be that so much space time squeezing make these particles? to conserve something in the long run?

  • @lightningnetwork
    @lightningnetwork 5 лет назад

    favourite teacher :D !

  • @readingaddict
    @readingaddict 3 года назад

    I cannot love him anymore than I do now. I am devoted

  • @KalyanBanerjee
    @KalyanBanerjee 6 лет назад

    That energy how he express :)

  • @supahsekzy
    @supahsekzy 8 лет назад +2

    I need that shirt.

  • @lutpulla7183
    @lutpulla7183 7 лет назад

    How can Prof. Lewin talk about matter in a black hole being squeezed into a point with no size, when we don't know what is beyond event horizon? Or am I wrong and we know about the size?

    • @ffggddss
      @ffggddss 7 лет назад

      We can only talk about what our best theories say about it; no black hole has been directly observed. Yet.
      And what he's expounding, is based on Einstein's General Theory of Relativity (GR). And we know what GR says; the Prof. is giving you the straight dope on that.
      [I speak from having taken a graduate-level course on GR at U. of Md. under Prof. Charles Misner, about 40 yr ago.]
      But we still can't reconcile GR with quantum mechanics (QM), so the existence of singularities is still in some doubt.
      We do know that QM says that, at sufficiently small scales (Planck units), spacetime can no longer have continuous properties, due to the Heisenberg Uncertainty Principle; it is postulated that it must take the form of a sort of 'quantum foam.' This in itself, precludes the existence of a spacetime singularity.
      But we just can't say yet, what the final theory will look like, that will bring GR and QM together. It is currently a very cutting-edge frontier of theoretical physics; and the mathematics involved, makes the math of GR seem like a walk in the park.

  • @nirmalbalamurugan1678
    @nirmalbalamurugan1678 7 лет назад

    great

  • @plabonborthakur4572
    @plabonborthakur4572 5 лет назад

    If we can meet someday

  • @sywaddr11
    @sywaddr11 6 лет назад

    I want the price😂
    Dear Sir. I want to prove that dark matter is only the size difference. It just like the nano to us, and many much smaller. Can you recommend, what I should do? And the dark energy is the magnetic fields interacted within that small fields. And particle aggregation forming the universe.
    Thank you!

  • @arturogonzalez6184
    @arturogonzalez6184 6 лет назад +1

    I wish I could meet you one day

  • @ValMartinIreland
    @ValMartinIreland 8 лет назад

    A large star is made up of atoms irrespective of what element those atoms are. When such a star is compressed by gravity into small object, what happens to the atomic structure of the atoms. I presume the nucleus is compressed and the electrons are forced into a smaller obit. So what happens?

    • @ronaldderooij1774
      @ronaldderooij1774 8 лет назад +1

      +Val Martin The electrons are forced into the neucleus, changing protons to neutrons. Hence the name of the star.
      There is no plus or minus charge in the material anymore. No protons, no electrons, just neutrons.

    • @ffggddss
      @ffggddss 7 лет назад

      + Ronald de Rooij
      Right; well said! It can be added, though, that those neutrons are composed of quarks that *do* have electric charges. (A neutron does, e.g., have a magnetic moment.)

  • @subhrajitnandi5447
    @subhrajitnandi5447 5 лет назад

    The billion dollar sentence "It all come down to Physics"

  • @AdhamMagdy
    @AdhamMagdy 5 лет назад +1

    The more we know, the less we seem to know

  • @born13611
    @born13611 4 года назад

    It was already mentioned in holy Qur'an 14th centuries ago.
    Chapter 77, verse 8.
    فَإِذَا ٱلنُّجُومُ طُمِسَتْ
    (Then when the stars lose their lights)

  • @guarapo66
    @guarapo66 10 лет назад

    11:33 the power of the ring

  • @omsingharjit
    @omsingharjit 6 лет назад

    but i heard iron not carbon when star stop its fusion ???????

    • @AndDiracisHisProphet
      @AndDiracisHisProphet 6 лет назад

      depends on the mass of the star

    • @stargazer7644
      @stargazer7644 5 лет назад

      Stars around the mass of our sun will stop with carbon. It doesn’t have enough mass to get to the temperatures to fuse higher elements. Only the big stars make it all the way to iron.

  • @paritoshjadhao5352
    @paritoshjadhao5352 5 лет назад

    sir how sun burns in vacuum ,not in presence of atmosphere

    • @GH-oi2jf
      @GH-oi2jf 9 месяцев назад

      He is using the term “burn” loosely. Nuclear fusion is not ordinary combustion.

  • @edmondedwards6729
    @edmondedwards6729 5 лет назад

    I would disagree of thinking that the black hole has "infinite" gravitational energy. I would refine that to say that a black hole has the largest measurable gravity force within the confines of this universe, or another one that is built upon the logic structures that underlies ours. Instead of infinite, read practical maximum. thanks walter

  • @dennish72
    @dennish72 5 лет назад

    The ultimate question of course is what is the meaning of all this.

    • @stargazer7644
      @stargazer7644 5 лет назад

      There is no meaning. It is simply how physics works.

  • @subhashmaurya3023
    @subhashmaurya3023 5 лет назад

    according to me...
    dark energy or matter exist in the space but i would like to share my thinking....
    1) it exist but it is moves/travels in space so fast....that is faster than light....it cannot be possessed or seen or observed....
    2) the dark energy is so powerful....so powerful....more powerful than infinity....beyond our thinking.....that the energy cease to exist....it is present in our multiverse/ universe but we cannot define its presence....it gives energy to another part of unknown objects or dimensions...
    3) the dark matter is also provided energy by the dark energy.....the energy and matter may show similar properties hence the amount of enerfy received by the matter would be so great that it becomes infinitely energetic and thus like the energy it also cease to exist...
    i may be wrong at all....but anyone else could explain me if im wrong....

    • @subhashmaurya3023
      @subhashmaurya3023 5 лет назад

      @FREDDYFUZBEAR yeah you're right.......that was my brother.....now according to u anything that travels faster than light can achieve unlimited power.....thats where youre wrong sir......our universe is also expanding....and its expanding faster than the speed of light and according to scientist the fastest thing to go is light in the whole cosmos and nothing is faster than that.....and tychon is not yet discovered or known to us.....what assurance could you give us that this* object is travelling faster than the speed of light and having infinite power and so called tychon......
      2) i think dark matter is the negative of our universe's matter....idk about that much

    • @subhashmaurya3023
      @subhashmaurya3023 5 лет назад

      @FREDDYFUZBEAR now you're talking😊

  • @gourabghosal2841
    @gourabghosal2841 9 лет назад

    but why do not a star directly turned into a black hole/

    • @alexandrugheorghe5610
      @alexandrugheorghe5610 9 лет назад +1

      Gourab Ghosal it needs enough mass that when it collapses due to gravity it becomes a black hole; you could say that when gravity collapses it, this event will punch a "hole" in the fabric of space time (due to the huge mass)
      you can refer to his pen example: when you drop it, gravity takes over and pulls it down to the center of the earth, now imagine enough mass that is so high that it will go through the earth and through spacetime into a single point

    • @floreign
      @floreign 9 лет назад +3

      Gourab Ghosal While gravity contracts the mass of the protostar indeed toward collapse, at some point, when temperature becomes just right, hydrogen fusion starts in the core of the star. This creates an outward pressure that balances the gravity push. This condition is called hydrostatic equilibrium and dictates the size of the star. For as long as fusion can happen, gravity does not squeeze the mass of the star any further. But when fusion can no longer occur (when all the fusion fuel has been depleted), gravitational contraction resumes. If the mass is enough, then the result of this compression is a white dwarf and it cannot compress any further. If the mass is even larger, and is over a certain minimum mass, then the result is a neutron star but compression cannot push any further. But if the mass of the star is even above another limit, then nothing can stop that contraction and then you have the black hole.

  • @Lokesh-bo1zl
    @Lokesh-bo1zl 5 лет назад

    if supernova explosion took place at a distance of 6000 light years, wouldnt we see it after 6000 years

    • @Kugelbliz
      @Kugelbliz 5 лет назад +1

      That is correct. That light from the super nova from walters example took 6,000 years to get to the earth in 1,054.

    • @arnavjain7566
      @arnavjain7566 4 года назад

      @@Kugelbliz yeah it was exploded 6000 years before the year 1054.

  • @abcdef2069
    @abcdef2069 7 лет назад

    i like to believe dark matter things and big bang more if one can show me where the center of universe is, which is the violation of relativity. big bang and dark matter completely violates the conservation of energy, as if we have someone pushing some kind of inter- galactic sized piston to pump energy into our universe.
    even all particle spins are relativistic effect. charges are conserved, only because some kind of symmetry exist SU3. or they may use words like things are cononically related.

  • @NondescriptMammal
    @NondescriptMammal 8 лет назад

    Just because the sun is nuclear energy, doesn't make it not clean, nor does it follow that all nuclear energy is clean as that from the sun.

    • @greatsea
      @greatsea 8 лет назад

      +Nondescript asperger's much?

  • @muhammadgultasifkhan1951
    @muhammadgultasifkhan1951 5 лет назад

    what will happen to the earth if the sun dies??

    • @stargazer7644
      @stargazer7644 5 лет назад

      When the sun puffs up in its red giant phase, it will consume the earth and other inner planets.

  • @jatinbhatt7826
    @jatinbhatt7826 5 лет назад

    The 96 percent is space . One day scientists will realise this .

  • @muhammadismail2300
    @muhammadismail2300 7 лет назад

    Professor. The sun emits heat through nuclear fusion. This means that it constantly loses its mass according to Einstein's famous equation E = mc2. According to Einstein's general relativity, gravity is proportional to the mass. This means that the sun's gravity is constantly decreasing because its mass is constantly decreasing. The Earth's Earth orbit will also increase and lead to an increase in the duration of the year, but the Earth has existed for 4.5 billion years.
    and that doesn't happen
    why?

    • @StormCentre88
      @StormCentre88 5 лет назад

      One related reason is that it takes an enormously long time for a photon (100, 000 years) to make its way out of the Sun to the surface; so the Sun emits energy very slowly if you look at the entire reaction chain.
      So, (within reason) currently the Sun's thermonuclear reaction is reasonably stable.
      Also, consider the sun's radius is not perfectly stable due to rotation and other effects; even when the Sun is reasonably stable.
      These slight changes in the Sun's radius when it is stable probably swamp the gravitational changes (due to lost mass) during the Sun's stable lifetime.
      All this plus the fact that gravitational force is proportional to the distance between the Sun and Earth also plays a factor.

    • @hibiscusenigma
      @hibiscusenigma 5 лет назад

      energy and mass in e=mc^2 is not interchangeble but proportional meaning if energy is increasing the mass is not increasing but the momentum is increasing. It's unimaginable that if I aprroach the speed of light I gain more particles/atoms causing me to become more massive? The only thing that a matter can loss/gain mass is if you take away or add some atoms or particles (like if you boil a water then the mass inside the container will change because some atoms evaporated in the air or if you split the nucleus of an atom then the mass will decrease) not because there is a decrease in energy.

  • @kingjeremysircornwell7847
    @kingjeremysircornwell7847 5 лет назад

    Giant ball of methane, and earth is the gas tank, magnetic fields can strip and transport the methane particles.

  • @manolo1130
    @manolo1130 9 лет назад +7

    Also, he is my favorite teacher.
    On December 8, 2014, MIT announced that Lewin engaged in online sexual harassment of an online MITx learner in violation of MIT's policies. As a consequence, MIT revoked Lewin's professor emeritus title and indefinitely removed Lewin’s online lectures from its online learning platforms.

    • @SeriousScience
      @SeriousScience  9 лет назад +27

      We are not going to delete Prof. Lewin's videos.

    • @AdivingShamWow
      @AdivingShamWow 9 лет назад +1

      I do not believe you Monolo. and your nothing on this internet. not even a single atom. compared to Walter. unless your IQ is even at least 100 point away from matching his, no one cares about your facts. Walter has formulas, and explanations for all of his teachings. I advise you just shut it :)

    • @MaryMsB
      @MaryMsB 9 лет назад +4

      manolo martinez Manolo, Thanks for the info. I was wondering why I couldn't find him on MIT's Open Courseware site. I have only just discovered him on You Tube. It is a disappointment MIT has removed his work, as it must be for you since he is your favorite teacher. I am grateful that SeriousScience will be keeping his videos.

    • @MaryMsB
      @MaryMsB 9 лет назад +1

      manolo martinez In addition to SeriousScience, it turns out his lectures can also still be found on iTunes University.

    • @manolo1130
      @manolo1130 9 лет назад +6

      Advising ShamWow i dont understand your point, but are not my facts, are from MIT, just read:
      newsoffice.mit.edu/2014/lewin-courses-removed-1208

  • @yo696
    @yo696 3 года назад

    He probably is the reincarnation of Richard P. Feynman

    • @GH-oi2jf
      @GH-oi2jf 9 месяцев назад

      He was born long before Feynman’s death.

  • @andrerousselsapet5219
    @andrerousselsapet5219 Год назад

    No one can prove GRAVITY 😬😬😳

  • @MKMKrueger
    @MKMKrueger 6 лет назад

    didatico

  • @andrerousselsapet5219
    @andrerousselsapet5219 Год назад

    You see a great factor
    To know
    In the Bible
    John 12:24
    24 Verily, verily, I say unto you, Except a corn of wheat fall into the ground and die, it abideth alone: but if it die, it bringeth forth much fruit.
    25 He that loveth his life shall lose it; and he that hateth his life in this world shall keep it unto life eternal.
    Die is mentioned x2
    So life comes out of DEATH
    😂
    THIS IS the deepest part of God

  • @akshaymutha5933
    @akshaymutha5933 5 лет назад +1

    Ohh cmon!! Scientists talk about their “observations” with such confidence as if they were facts. They are just correlating. Thats it!

  • @muhammadfawadabbasi9021
    @muhammadfawadabbasi9021 Год назад

    @lecturesbywalterlewin.they9259
    what Quran says about this 1450 years ago is 9:00 "Then I swear by the setting of the stars," (56:75)
    "And indeed, it is an oath - if you could know - [most] great."