The Origin of the Elements

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Shkencë dhe teknologji

The world around us is made of atoms. Did you ever wonder where these atoms came from? How was the gold in our jewelry, the carbon in our bodies, and the iron in our cars made? In this lecture, we will trace the origin of a gold atom from the Big Bang to the present day, and beyond. You will learn how the elements were forged in the nuclear furnaces inside stars, and how, when they die, these massive stars spread the elements into space. You will learn about the origin of the building blocks of matter in the Big Bang, and we will speculate on the future of the atoms around us today.
Speaker: Dr. Edward Murphy, University of Virginia
Date: November 13, 2012

Komente

  1. Raphael Andrews
    Raphael Andrews
    Ditë më parë

    omg this great. I have seen Dr. Murphy before talking about Astrononey. He is brillant. thank you for posting this.

  2. Sudath Chandra
    Sudath Chandra
    4 ditë më parë

    Everything recylcling....."Samsara"

  3. Mark Gietzen
    Mark Gietzen
    4 ditë më parë

    Thank you, Dr. Murphy, for an outstanding presentation!

  4. Takashi Tobiishi
    Takashi Tobiishi
    7 ditë më parë

    Splendid presentation. Thank you for uploading ! I will refer this video repeatedly from now on .

  5. Simon Simon
    Simon Simon
    7 ditë më parë

    What is 'heavy water?'

    1. Jefferson Lab
      Jefferson Lab
      6 ditë më parë

      Most elements have more than one isotope. Hydrogen has three common isotopes: protium (one proton), deuterium (one proton, one neutron) and tritium (one protons, two neutrons). In heavy water, one of the 'regular' hydrogen atoms is replaced by deuterium. So, it's heavier because of the extra neutron.

  6. John Feesey
    John Feesey
    8 ditë më parë

    Praseodymium

    1. Jefferson Lab
      Jefferson Lab
      7 ditë më parë

      Gesundheit.

  7. Katie Bellenger
    Katie Bellenger
    10 ditë më parë

    Spoken clearly and made easy to understand

  8. CASSANDRA DARWINIANA FATHER KNOWS BEST
    CASSANDRA DARWINIANA FATHER KNOWS BEST
    10 ditë më parë

    This is a wonderful clear objective lesson from an outstanding professor. Brazil

  9. Scott Clark
    Scott Clark
    11 ditë më parë

    I had a doctor appointment the other day and the first thing the doctor said was, "How are you doing?" I told him that considering all the protons, neutrons and electrons in my body are 13.7 billion years old, I think I'm doing pretty well.

  10. Shree Datatrae Koul
    Shree Datatrae Koul
    14 ditë më parë

    I thank technology that has made it possible for me to hear from the best learned person on a subject that interests me.

  11. Dewitt Reeve
    Dewitt Reeve
    14 ditë më parë

    The best science talk I’ve seen.

  12. William Fritz
    William Fritz
    18 ditë më parë

    Been reading 'physics for poets' popularizings of astronomy for decades and never got so many questions answered so efficiently and clearly. Unclear what makes a white dward white if it can't generate nucelar reactions any more. Sheer compression? Anyway, vastly helpful. THANKS!

    1. William Fritz
      William Fritz
      18 ditë më parë

      @Jefferson Lab AWESOME! Thank you!!

    2. Jefferson Lab
      Jefferson Lab
      18 ditë më parë

      Partly, yes. There's a lot of gravitational potential energy that gets converted to heat when the star collapses into a white dwarf. Also, what's left after the creation of a planetary nebula is the star's core. Well, some inner layers along with the core. The point being that the cooler, outer layers are ejected, so what eventually collapses to form the white dwarf starts off at a relatively high temperature to begin with. Given enough time, a white dwarf will eventually cool to become a black dwarf, although I don't think the universe is actually old enough for any of those to have formed yet.

  13. Greg Weil
    Greg Weil
    18 ditë më parë

    Wonderful lecture. Thank you

  14. Aleksandr Wostrikow
    Aleksandr Wostrikow
    19 ditë më parë

    Лекция по школьной программе 8го класса, школы в России.

    1. Jefferson Lab
      Jefferson Lab
      19 ditë më parë

      This is a talk given to the general public. It isn't expected, or desired, to be at an exceptionally high level.

  15. Alberto Ritteri
    Alberto Ritteri
    21 ditë më parë

    Molto interessante questa lezione , ed istruttiva. Grazie!

  16. Jerry T
    Jerry T
    25 ditë më parë

    Murphy is a truly gifted lecturer and speaks clearly and provides enough explanation and details for anyone to understand this fascinating subject. I would like to know a few things: 1) what gives particles their opposite charges? Why does that have to exist? Is it related to antimatter, 2) what occured before the big bang? 3) is nothing inherently unstable and we are going through universe cycles as the universe expands, and returns to nothingness? 3) why are these atomic particles spherical or round in shape. 4) why are there such great differences in sizes between stars. Thanks

  17. Gustavo Mendez
    Gustavo Mendez
    Muaj më parë

    amazing lecture

  18. Geoff Geoff
    Geoff Geoff
    Muaj më parë

    Very good. Question. When our sun goes giant red, the outer portion of earth will vapourise. What will happen to the rest? Will it become a large asteroid or just a small planet?

    1. Geoff Geoff
      Geoff Geoff
      22 ditë më parë

      @Jefferson Lab thanks for thoughtful answers. I guess I won't hang around then.lol. The supply of material did cross my mind.

    2. Jefferson Lab
      Jefferson Lab
      24 ditë më parë

      @Geoff Geoff Sure, but where would the material come from? After the red giant stage, the sun will turn into a white dwarf. So, a star the size of a planet. We aren't getting material from that (too far away). The sun's outer envelope would have been blown off during the red giant stage, so we aren't getting material from that, either. I suppose the Solar System could happen to wander through some random nebula. Given enough time, that's guaranteed to happen. But, I wouldn't expect what's left of the Earth to be able to pack on a substantial amount of material in any reasonable amount of time. You could also have a collision with another Solar System object. Mars, perhaps. But, the safe money is that there would be no substantial change in size for an extended period.

    3. Geoff Geoff
      Geoff Geoff
      25 ditë më parë

      @Jefferson Lab so, we are left with a small planet. Will this accumulate material due to gravity and increase in size again?

    4. Jefferson Lab
      Jefferson Lab
      Muaj më parë

      The earth will end up being in the sun. So, the eventual melting of the planet and the incorporating of the earth's material into the sun. If the sun doesn't make it out this far, then you'll end up with the gradual evaporation of the planet. The red giant stage probably won't last long enough to completely finish the job, though, so you'll end up with a planet-sized, metal-rich 'asteroid' in orbit around a white dwarf.

  19. First order commander games
    First order commander games
    Muaj më parë

    Expertly said and explained. Dr. Murphy really has a gift for communicating complex information to lower life forms causing absorption of said material.

  20. duncan cameron
    duncan cameron
    Muaj më parë

    Brilliant lecture. The only niggle for me is that many eminent scientists and philosophers have stood before us with the ultimate truth, based on unequivocal proof, only to be subsequently proven wrong. I'm not saying he's not right in some of what he says, only that he might be.

  21. Jim Weatherbie
    Jim Weatherbie
    Muaj më parë

    Awesome lecture. Thank you...

  22. Fernando Alexis Bernabe
    Fernando Alexis Bernabe
    Muaj më parë

    Excellent Lecture! Thanks So Much, Professor.

  23. 13minutestomidnight
    13minutestomidnight
    Muaj më parë

    6:05 Not counting spacecraft that manipulate space and time to by-pass the speed of light rather than accelerate towards C. What? Star Trek had some good theoretical ideas for space travel. 11:29 Well, apart from highly unstable proton-neutron configurations that we've been unable to stabilise (tech advancements and all that). But rather than the elements, I'd think it'd be all the insanely advanced materials and tech we wouldn't recognise...and because of that there's no way we'll know about alien spacecraft until they want to be found (and after they've had a brief look at humans, I'd guess that wouldn't be happening any time soon). Anyway, awesome lecture. Really engaging presentation. Answers some of my questions about chemistry in stars.

  24. John Flood
    John Flood
    Muaj më parë

    A really really good talk. Very interesting and informative.

  25. YS
    YS
    Muaj më parë

    This is amazing lecture. Thank you.

  26. Ashu choudhary
    Ashu choudhary
    Muaj më parë

    As we know Black hole have great gravitational attraction, it can easily absorbe large stars , planets which have high mass elements within , now can black hole initiate further fusion reaction (like stars in their core) with the help of super high gravity? Can black holes eject further more heavy elements that are not yet discovered?

    1. Jefferson Lab
      Jefferson Lab
      Muaj më parë

      Nope. You have regular matter falling down a very aggressive gravitational gradient. It's just regular old conversion of gravitational potential energy into something else. No different in principle than pulling a book off a shelf and dropping it.

    2. Ashu choudhary
      Ashu choudhary
      Muaj më parë

      @Jefferson Lab ohk! Look at energy of these gamma jets ,such high energy gamma radiation must be produce from very heavy elements nuclear transitions possibly.Elements that are not in periodic table

    3. Jefferson Lab
      Jefferson Lab
      Muaj më parë

      @Ashu choudhary The jets do not come from the black hole. They come from the material spiraling around the black hole.

    4. Ashu choudhary
      Ashu choudhary
      Muaj më parë

      @Jefferson Lab ok ! Now what about jets which are come from Black hole center. Is they contain only gamma radition or particles ( elements)?

    5. Jefferson Lab
      Jefferson Lab
      Muaj më parë

      The escape velocity from a black hole is greater than the speed of light (that's why black holes are 'black'). If a black hole were to create new elements, they would be trapped within the black hole.

  27. Ayza Diaz
    Ayza Diaz
    Muaj më parë

    Never thought I’d be getting a lecture by Eddie Murphy 😩jkjk🤣fantastic lecture!

  28. Evaldo Gonzalez
    Evaldo Gonzalez
    Muaj më parë

    I stumble across this video every few years, I never tire of watching it.

  29. Lawrence Shuda
    Lawrence Shuda
    Muaj më parë

    W.O.W.

  30. C. ACOSTA
    C. ACOSTA
    Muaj më parë

    This presentation is so fantastic. I must admit I have replayed three times while traveling/driving. Excellent.

  31. james hotz
    james hotz
    Muaj më parë

    So what's beyoud the universe as we know it? So where is the end of infinity?

  32. litltoosee
    litltoosee
    Muaj më parë

    Where does the electric charge play in?

  33. George Paul
    George Paul
    Muaj më parë

    This is the kind of professors we should have to introduce an essential complex subject to high school students and freshman college physical science courses.

  34. George Paul
    George Paul
    Muaj më parë

    Wonderful presentation of what matter is.

  35. Scott Sullivan
    Scott Sullivan
    Muaj më parë

    Great lecture.

  36. Edson Souza
    Edson Souza
    2 muaj më parë

    One of the best classes I've ever had! Excellent Professor Edward Murphy!

  37. Nadiah F. Hussaini
    Nadiah F. Hussaini
    2 muaj më parë

    Excellent.

  38. Axcel Domingo
    Axcel Domingo
    2 muaj më parë

    Omg it's my unforgettable experienced during my highschool days and I hate science because of this periodic table of elements! But this video it's interesting! It easily understand those some elements! I think I have learn a lots from this video! Atom is the smallest particles in our world if Im not mistaken!

  39. Nature and Physics
    Nature and Physics
    2 muaj më parë

    "The Oxygen-units are vital to the function of the _Enterprise._ "

  40. Kalman
    Kalman
    2 muaj më parë

    12:00 I was under the impression that it has since been disproved that electrons revolve at such a great distance. Valence electrons are the furthest away, and even those, I believe, are very close to the nucleus. I don't understand how electricity would work if the electrons were that far away because electricity is the flow of electrons along the surface of a conductor, which implies that the electron is very near making contact with the surface.

    1. Jefferson Lab
      Jefferson Lab
      2 muaj më parë

      The electrons are far from the nucleus when compared to the size of the nucleus. You aren't confusing his analogy with the actual distance, are you?

  41. LION22
    LION22
    2 muaj më parë

    He is too confident but he forgets that, we have only started with technology, don't be surprised if we sample proxima Centuri in as little as 100 years.

  42. JamesSCavenaugh
    JamesSCavenaugh
    2 muaj më parë

    50:17 - If your atoms have been in at least 2 or 3 stars in the history of the universe, how long does it take to recycle the atoms? Surely there has to be a lag time from being in one star to being in the next as stars die and are born. If the sun is middle aged at 4.6 billion years and the universe is 13.7 billion years, it doesn't add up.

    1. JamesSCavenaugh
      JamesSCavenaugh
      2 muaj më parë

      @Jefferson Lab Thank-you for the reply. I'd never heard that the half-life was related to the energy emitted. In my field we have to have serial measurements to determine the half life. Thanks again.

    2. Jefferson Lab
      Jefferson Lab
      2 muaj më parë

      It was in the main lecture. It wasn't really pounded on, but it's mentioned around 42:51. The lifetime is determined by the mass and luminosity. The mass tells you how much fuel is available and the luminosity tells you how quickly energy is being produced. So, if I know how much fuel is in the tank and I know the rate at which I'm using the fuel, I can tell how long it will be until the fuel runs out. For the elements that decay through alpha decay (which is the common decay mode for the heavy elements), the half life is related to the energy of the emitted alpha particle. So, one only needs to measure the energy of the ejected alpha particle to determine the half life. For the 'barely radioactive' isotopes, the energy of the alpha particle is rather small, so the measurements can get a little tricky, but you don't need to wait for a large number of events to determine the half life, which is nice if the thing is barely radioactive.

    3. JamesSCavenaugh
      JamesSCavenaugh
      2 muaj më parë

      @Jefferson Lab Thanks for the explanation. That would have been helpful in the main lecture. If you don't mind, how are these lifetimes determined? Also, for that matter, how are the half-lives for long-lived isotopes determined? It seems that the uncertainty for t_1/2 for such elements must be pretty high if they're basically stable on the time scale of a human life, or since we got instruments to detect their decays.

    4. Jefferson Lab
      Jefferson Lab
      2 muaj më parë

      It does add up. You're just doing the wrong math. While the sun will be on the main sequence for ~10 billion years, sun-type stars don't go supernova. The stars that do are much larger than the sun and spend much less time on the main sequence. A typical O-type star has a lifespan of about 10 million years. Getting cycled through three of those would take 30 million years. Say that cycling would had to have ended by the time the universe was 9 billion years old. Having 9 billion years in which to do 30 million years worth of 'processing' isn't much of a stretch, even with a couple billion years between each processing event.

  43. Fuat Akça
    Fuat Akça
    2 muaj më parë

    Very good lecture, thank you.

  44. MrWaalkman
    MrWaalkman
    2 muaj më parë

    Fantastic lecture!

  45. Mulugeta Zeleke
    Mulugeta Zeleke
    2 muaj më parë

    very educative and useful reminding me what i learned long time ago. Thanks for your contribuition.

  46. mccloysong
    mccloysong
    2 muaj më parë

    Very well explained. Very clear and good pace.

  47. Skip Young
    Skip Young
    2 muaj më parë

    How do the scientists know that the initial period of nuclear reaction after the Big Bang lasted only 3 minutes? A minute is part of an hour, which is part of a day -- all of which are Earth measurements. But Earth did not exist immediately after the Big Bang, so what exactly was a "minute?" Back then a minute could have been 1 million years...

    1. Jefferson Lab
      Jefferson Lab
      2 muaj më parë

      A minute back then is the same as it is now. The universe doesn't care what units we invent. Likewise, a process can be measured in whatever units we invent. The calculations carried out by human scientists will be described by human units of measure.

  48. 2 cents
    2 cents
    2 muaj më parë

    And the biblical part of "we therefore commit this body to the ground, earth to earth, ashes to ashes, dust to dust; in sure and certain hope of the Resurrection to eternal life" also makes weird sense if you think about it as in the lecture.. Our body is made of stuff made from the stars, gets recycled a gazillion times on earth and then when the sun dies gets pushed out to the stars again. The old guys just forgot to tell us that it was "star dust to star dust". Just fooling around here! Love the lecture!

  49. 2 cents
    2 cents
    2 muaj më parë

    So the universe as we see today all came from gamma rays? So when God actually started off creation by saying "let there be light", the big bang happened? Of course, the light would have been all gamma rays, not the stuff we see...

  50. Gavin Powell
    Gavin Powell
    3 muaj më parë

    Why are we not using thorium in nuclear reactors?

  51. dawei53
    dawei53
    3 muaj më parë

    That was one of the best lectures I've seen and heard. Dr Murphy spoke in a way that was easy to understand and made the subject of the talk very interesting. I learned a lot; I just hope that I can remember it all.

  52. Jānis Bērziņš
    Jānis Bērziņš
    3 muaj më parë

    Best.ALfirst.Video.Ever! Really, ongoing is just for the lol's. We was made by mistake. Just a slight miscalculation of antimatter in simulation, and here we are.

  53. Fred Flintstone
    Fred Flintstone
    3 muaj më parë

    Look it up on Jersey shore or in the history of automobile manufacturers.

  54. Positive Agression
    Positive Agression
    3 muaj më parë

    37:53 that burned out star greatly resembles the shape of a human eye.

  55. Marvin Mauldin
    Marvin Mauldin
    3 muaj më parë

    Very good high school level presentation, no wrong material, just too many time constraints for getting into neutron stars, merging neutron stars, black holes, neutrinos, quarks, and the general quantum mechanics of element formation.

  56. Brian Magnuson
    Brian Magnuson
    3 muaj më parë

    Is there a transcript?

    1. Jefferson Lab
      Jefferson Lab
      3 muaj më parë

      There are closed captions.

  57. ALVIN DIMES
    ALVIN DIMES
    3 muaj më parë

    Absolutely fascinating, great lecture brilliant tutor love it.

  58. Rick Evans
    Rick Evans
    3 muaj më parë

    Technique is used in aircraft allot alumni in and I we you get a splinter of it in your hand it doesn't help well because of that technium

  59. G M
    G M
    3 muaj më parë

    This dude knows his stuff. I need to listen to this over and over again.

  60. Vike21
    Vike21
    3 muaj më parë

    I've heard so many speakers throughout my life so far and you Sir, are one of the best. Well spoken, clear, no mistakes, loud, not too slow, but not too fast, just a joy to learn from. Thank you.

  61. Jason Powell
    Jason Powell
    3 muaj më parë

    Tc-99 has a half life of 211000 years...

  62. Jacek Kubiak
    Jacek Kubiak
    3 muaj më parë

    Fascinating explanation! Than You.

  63. RC65
    RC65
    3 muaj më parë

    😩

  64. santo goso
    santo goso
    3 muaj më parë

    Thank You I learned thanks to your enthusiasm causing a fission reaction within my neurons)) on the other hand Im now worried Ill be a bad Nebula :)

  65. Evandro Nakazone
    Evandro Nakazone
    3 muaj më parë

    So our universe could be someone colliding matter we don´t know to see what their universe is made, Cooooool!!!

  66. Tomas Janik
    Tomas Janik
    3 muaj më parë

    How can they count the number of protons, neutrons and electrons in an atom when they can't even properly see an atom nowadays let alone long time ago when the elements were discovered?

    1. Jefferson Lab
      Jefferson Lab
      3 muaj më parë

      Protons and electrons have equal, but opposite, charges. Atoms are electrically neutral, so atoms must have the same number of electrons as protons. The number of protons can be determined by measuring the energy of X-rays emitted from atoms when the innermost electrons are knocked out of them. Do a search for 'Moseley' and 'atomic number' for more information. Protons and neutrons have nearly the same mass. The mass of an atom is relatively easy to determine. If you know the total mass, and you know the number of protons, then you can determine the number of neutrons. If example, if an atom has a relative mass of 15 units, and you know that it contains 8 protons, then the remaining 7 units must be due to the neutrons.

  67. Blocked For Flaying sis BluestromZ and Gaymarapalli
    Blocked For Flaying sis BluestromZ and Gaymarapalli
    3 muaj më parë

    Couldn't even blink from the beautiful amount of information!

  68. Jammer 65
    Jammer 65
    3 muaj më parë

    Flagstaff Arizona has a dark sky ordinance. The city enacted the world's first outdoor lighting ordinance in 1958.

  69. Jammer 65
    Jammer 65
    3 muaj më parë

    Don't scientist believe there might be stable long lasting superheavy elements farther up the periodic table? They call it “Island of Stability”

    1. Jefferson Lab
      Jefferson Lab
      3 muaj më parë

      Yes, but they aren't 'missing' from the table. If tomorrow they discover element number 128, then we can say that elements 119-127 are missing. But, for now, there are no gaps in the table, so there are no missing elements. It's a bit like a series of books. You wouldn't say that the Harry Potter series is missing book #12, right? If book #12 gets published, tough, you'd say "Wow. Lot of missing books there."

  70. Rolando Cruzado
    Rolando Cruzado
    3 muaj më parë

    Fantastic presentation, ...from Geological Society of Peru..bless you !!!.

  71. alex
    alex
    3 muaj më parë

    What a thought provoking presentation! Thank you!

  72. Gold Man
    Gold Man
    4 muaj më parë

    Lecturer flowed like a river.

  73. Linus 6626 Feynstein
    Linus 6626 Feynstein
    4 muaj më parë

    Excellent presentation.greetings from Berlin

  74. mohamed khatib
    mohamed khatib
    4 muaj më parë

    From where actually the neutron came from ?

    1. zither zon
      zither zon
      4 muaj më parë

      A proton combined with an electron is a neutron. See "neutron star"

    2. Jefferson Lab
      Jefferson Lab
      4 muaj më parë

      The same way the protons did.

  75. Aurangzeb Alamgir
    Aurangzeb Alamgir
    4 muaj më parë

    I am a Chemistry Physics high school teacher and i found this lecture very useful for our students. it's awesome. thanks a lot.

  76. Matthew Eisentraut
    Matthew Eisentraut
    4 muaj më parë

    He mentions the sighting of the supernova event in 1987 known as SN 1987A. This exploding star is located about 168,000 light years from us in the Large Magellanic Cloud. So, the actual event happened about 168,000 years ago because that is how long it took the light to get here. This all makes sense in a universe that is 13.6 billion years old. However, according to young earth creationists, God created the universe just 6000 years ago. So, according to them, that star never even existed. God just created light from an event that never happened and sent it to us to fool us into thinking that star exploded. In fact most of what we see in the night sky does not and never did exist according to this kind of "thinking." I thought this was a wonderful lecture. He clearly presented the explanations about our origins that have been pieced together by scientists over many decades of observation and reasoning. It is sad and appalling that huge numbers of people dismiss everything that he has presented as just a pack of lies because it contradicts their simple ignorant dogmatic religious beliefs.

  77. Xardox17
    Xardox17
    4 muaj më parë

    As good an explanatory lecture on this subject as I've ever heard. Although this is First Level stuff, my attention was held masterfully.

  78. John Adams
    John Adams
    4 muaj më parë

    What a superb speaker and instructor. Dr. Murphy is very special.

  79. SuperReasonabledoubt
    SuperReasonabledoubt
    4 muaj më parë

    There's so much to learn , if only time could be rewound, independent for each individual , of course. Unless.......

  80. Alex Pronove
    Alex Pronove
    4 muaj më parë

    Bravo! What a splendid presentation that put context and scale in its explanation.

  81. Riya Bisht
    Riya Bisht
    4 muaj më parë

    I enjoyed this session to my fullest and learned a lot from it. I thank @Jefferson Lab for uploading such amazing and mindblowing lectures for free on YT. I never got an opportunity to enjoy such lectures in my real life till now but i hope to see myself enjoying them in future :)Thanks to YT also for making it possible for us. One question is that on google it's mentioned that sun also contains elements other than H,He and Li in small amounts like Oxygen, Carbon etc so why we didn't get these elements from our sun? maybe becoz they are present inside our sun in small quantities ?

    1. Riya Bisht
      Riya Bisht
      4 muaj më parë

      @Jefferson Lab Ok thank you for clearing my doubt☺.

    2. Jefferson Lab
      Jefferson Lab
      4 muaj më parë

      We didn't get those elements from the sun because they are in the sun. I mean, physically, that's where they are. The material that's in the sun can't also be here. Now, the nebula that eventually collapsed into the sun was the same nebula that formed the planets. Since the sun and the earth/planets formed from the same stuff, it isn't strange that the stuff we find on earth is also found on the sun. The material that formed the earth didn't come from the sun. The sun and the earth formed from the same bulk material.

  82. KALOL Kalol
    KALOL Kalol
    4 muaj më parë

    In believeable real eye opener

  83. E W
    E W
    4 muaj më parë

    Current theory is that the heavier elements like gold and platinum and uranium are made in neutron star collisions, not common supernovas.

    1. Jefferson Lab
      Jefferson Lab
      4 muaj më parë

      Half right. Heavy element creation via neutron star collision is a recently discovered pathway. But, it's "in addition to" supernovae, not "in replacement of" supernovae.

  84. Plant Plants
    Plant Plants
    4 muaj më parë

    Dr. Murphy is a WONDERFUL teacher..I was actually falling asleep in bed when this interesting video appeared and woke me back up held my attention all the way through.

  85. dominic ancelm
    dominic ancelm
    4 muaj më parë

    I love this professor's fantastic lecture... very neat and clear...his presentation style is very interesting... thank you sir and the people who arranged.

  86. George Konstantaras
    George Konstantaras
    4 muaj më parë

    so from Dust and to Dust !

  87. Carlos Alberto Teixeira
    Carlos Alberto Teixeira
    4 muaj më parë

    Extraordinary lecture. 1,000 thanks. And greetings from Rio. Merry Xmas.

  88. Levant Aygen
    Levant Aygen
    4 muaj më parë

    It was just excellent. No idea why 808 people disliked (as of December 22,2020) this wonderful video. Thank you sir for this superb lecture. LA, Davidson, NC - USA

  89. R J P
    R J P
    4 muaj më parë

    Thank you Dr Murphy for such a great and concise explanation. What is going on out there in billions of places makes our happenings on Earth seem totally insignificant. The words from that famous song come to mind: - "When the moon is in the Seventh House and Jupiter aligns with Mars, then peace will guide the planets and love will steer the stars. This is the dawning of the age of Aquarius! "

  90. Deja Vu
    Deja Vu
    4 muaj më parë

    Could most of the antimatter be condensed inside of black holes?

    1. Jefferson Lab
      Jefferson Lab
      4 muaj më parë

      You would have to explain why that process would be so selective. If matter and anti-matter were created in equal amounts, why would just the anti-matter end up in black holes? Not that this issue is unique to your proposed solution. The fundamental problem is that there is an apparent difference between matter an anti-matter, or a difference in how they are created. Either way, something happened that resulted in an imbalance between matter and anti-matter that left us in a universe containing matter.

  91. hfilipenk
    hfilipenk
    4 muaj më parë

    fhenadzi.wordpress.com atomic number of uranium is 96?

  92. A Willis
    A Willis
    4 muaj më parë

    Interesting

  93. andrew cobb
    andrew cobb
    4 muaj më parë

    On a rainy, cold December day, this is a ray of sunlight. Old uk duffer here, heading for redistribution :)

  94. VALERIE COOPER
    VALERIE COOPER
    4 muaj më parë

    Wow! A fantastic presentation!

  95. Karen Mann
    Karen Mann
    4 muaj më parë

    What a fantastic presentation!!!!!This guy truly has a “gift” for presenting information. ⭐️⭐️⭐️⭐️⭐️

  96. Stephen McCloud
    Stephen McCloud
    4 muaj më parë

    This is a little dated. Neutron star collisions are probably responsible for heavy element creation.

    1. Jefferson Lab
      Jefferson Lab
      4 muaj më parë

      The video was recorded in 2012. So, yes, it's a little dated.

  97. R T
    R T
    5 muaj më parë

    Is it possible that the anti-matter is imperceptible in this dimension?

    1. Jefferson Lab
      Jefferson Lab
      5 muaj më parë

      Anti-matter is routinely observed in this dimension.

  98. Eddie Olga
    Eddie Olga
    5 muaj më parë

    we discover the elements slowly(periodically) the odd thing is that the chart is mapped out w/the empty element spots, collapsed, and/y/&/dna numbered(allowing for missing element with number)

    1. Jefferson Lab
      Jefferson Lab
      5 muaj më parë

      Since the atomic number is equal to the number of protons in the nucleus, and since there's no such thing as a fractional proton, leaving space for missing elements is easy. If you have element 40 and element 42, you know that element 41 (and only element 41) should exist between them. We're likely to see this once element 120 is created since it is more likely that we'll create element 120 before element 119. So, we'll have a gap between 118 and 120, but we'll know the only thing that can go into that gap will be element 119.

  99. Eddie Olga
    Eddie Olga
    5 muaj më parë

    it is the way

  100. Luis Acero
    Luis Acero
    5 muaj më parë

    Excellent description of the Elements. It is a priviledge to have access to it.