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The Big Bang and Beyond: Exploring the Early Universe

Stagione 1
Taught by Professor Gary Felder of Smith College, this course covers the history of the early universe starting with the Big Bang and continuing to the formation of the first stars and galaxies hundreds of millions of years later. Professor Felder also looks ahead to the ultimate fate of the universe and to speculation on what may have happened before the Big Bang.
202212 episodiTV-PG
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Episodi

  1. S1 E1 - The Big Bang Changes Everything

    2 gennaio 2022
    33min
    TV-PG
    Explore the highlights of the Big Bang model, which says that the universe evolved from an initial hot, dense state billions of years ago. Find that the Big Bang wasn’t a moment when the cosmos had zero size, it didn’t take place at a special point in space, and it wasn’t necessarily the beginning of the universe. Rather, it was the energetic start of the expansion phase that is still underway.
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  2. S1 E2 - The First Few Minutes of the Universe

    2 gennaio 2022
    28min
    TV-PG
    Beginning a hundred-billionth of a second after the Big Bang, trace events as the universe quickly cooled from a quadrillion degrees. Learn about the strong, weak, and electromagnetic forces, and the fundamental particles—all of which precipitated from the seething cauldron of energy, even as matter and antimatter were mutually annihilating.
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  3. S1 E3 - First Galaxies, First Stars, and Dark Matter

    2 gennaio 2022
    31min
    TV-PG
    Continue the story of the early universe by exploring such highlights as the formation of the first atoms at 370,000 years, when space transitioned from opaque to transparent; the accretion of hydrogen and helium gas into protogalaxies after millions of years due to gravitational influence of dark matter; and the collapse of the gas into ever denser balls eventually leading to the first stars.
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  4. S1 E4 - How Big Was the Big Bang?

    2 gennaio 2022
    31min
    TV-PG
    Is it possible to calculate the size of the universe at the instant of the Big Bang? Assemble the clues that scientists use to address this question. In the process, discover a number of remarkable properties of the universe, including that it must be bigger that what we can see, extending beyond the boundary that limits our knowledge due to the finite speed of light and the age of the universe.
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  5. S1 E5 - Mysteries That Reshaped the Big Bang Model

    2 gennaio 2022
    31min
    TV-PG
    Evaluate three mysteries connected to the Big Bang model that baffled theorists beginning in the late 1960s. Why was the early universe so uniform? Why does the universe obey the laws of geometry we teach in high school? And how did the universe come to be made of the kinds of particles we see and not others? A single solution to all three questions seemed too much to hope for, yet one turned up.
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  6. S1 E6 - Inflation! The First Fraction of a Second

    2 gennaio 2022
    32min
    TV-PG
    Dig into the bizarre theory of inflation developed by physicist Alan Guth, which holds that for a fraction of a second just after the Big Bang the universe expanded at a mind-boggling rate, making the cosmos effectively infinite. Analyze how this idea solves the three puzzles introduced earlier. Learn about associated concepts, such as the scalar field and its decay, known as “reheating.”
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  7. S1 E7 - What Caused Inflation: The Scalar Field

    2 gennaio 2022
    31min
    TV-PG
    Can inflation possibly be true? See how a concept called a scalar field may be the inconceivably high-energy medium that spontaneously triggered inflation, leading to the observable universe—and more—in a billionth of a billionth of a billionth of a billionth of a second. Probe a rival theory that the Big Bang was caused by the collision of two universes in four-dimensional space.
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  8. S1 E8 - More than One Big Bang in a Multiverse?

    2 gennaio 2022
    30min
    TV-PG
    At one time, Earth was considered the center of the cosmos. Might the idea that the Big Bang was the beginning of everything be just as parochial? Take a mindboggling trip through the theory of eternal inflation—that our observable universe is a nearly infinitesimal speck inside a much larger, older, and eternally growing multiverse, in which inflation continually sprouts new universes like ours.
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  9. S1 E9 - Other Universes across Other Dimensions?

    2 gennaio 2022
    31min
    TV-PG
    Many physicists believe that our universe really isn’t three dimensional, but only appears so to us. Explore what it would mean if there are extra dimensions that we can’t see. Learn how to visualize this counterintuitive state, and examine what it implies for Big Bang theory and the concept of a multiverse. One set of ideas that calls for at least nine dimensions is string theory.
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  10. S1 E10 - The Origins of the Constants of Nature

    2 gennaio 2022
    30min
    TV-PG
    Constants of nature, such as the gravitational constant, appear to be fine-tuned to make life possible. Is this a coincidence of astronomical unlikelihood, an expected outcome of the nature of the universe, or does it imply that ours is one of many universes with different properties? Consider this question in light of the anthropic principle which takes the existence of observers into account.
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  11. S1 E11 - From the Big Bang to the Universe’s Fate

    2 gennaio 2022
    31min
    TV-PG
    Learn that the ultimate fate of the universe is tied to its beginning—to the as-yet-unknown conditions that preceded the Big Bang. Focus on the importance of dark energy, an enigmatic force discovered in the 1990s that is causing the universe to expand at an accelerating rate. Compare three scenarios that lead to either infinite expansion or eventual collapse in a Big Crunch.
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  12. S1 E12 - The Future of Early Universe Cosmology

    2 gennaio 2022
    34min
    TV-PG
    Conclude the series by reviewing the history of the universe, highlighting the major gaps in our knowledge. Then turn to four promising areas of experimental research that may provide answers. Let your imagination soar by contemplating theoretical possibilities such as this one: Could we exploit inflation to create a baby universe in the lab? Do we, in fact, live in someone else’s baby universe?
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Produttori

The Great Courses

Interpreti

Gary Felder

Produzione

The Great Courses
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