Affiche The Great Courses - Black Holes Explained in English
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Imagine a region in space where the force of gravity is so strong that nothing—not even light—can escape. A region with physical conditions so extreme that they have not yet been reproduced in any terrestrial laboratory. A region so dense that an object as tiny as a walnut would have the same mass as our entire planet. This phenomenon—first formed in the equations of Einstein and popularized in the stories of science-fiction authors—is a black hole: one of the most exotic, mind-boggling, and profound subjects in astrophysics. Black holes are at the heart of some of the most intriguing phenomena in the universe. Not only that, they are ideal gateways to fundamental and cutting-edge concepts in astronomy, including the following: General relativity: Einstein's general theory of relativity provides the framework for understanding black holes, in which the warping of both space and time is so great that they are effectively cut off from the rest of the universe. Monsters at the heart of galaxies: Detailed studies of the centers of galaxies reveal that supermassive black holes are common, with masses of millions to billions of suns. Nearly every large galaxy has one. Wormholes: According to general relativity, black holes may be connected to passages through space-time known as wormholes. The jury is still out on whether they exist and whether they would allow time travel and trips to other universes. Is the universe like a hologram? Quantum theory suggests that information is not lost inside a black hole but instead is encoded around it like a hologram—a phenomenon that may characterize the universe as a whole! Indeed, the idea that the universe itself has properties similar to black holes shows that these objects play a pivotal role at all scales: from the truly cosmic to the subatomic realm, where theory suggests the existence of mini-black holes that may have been created in the aftermath of the big bang and that could be produced in the latest generation of p


Saisons & épisodes Les résumés de tous les épisodes de The Great Courses - Black Holes Explained in English

S01E01 A General Introduction to Black Holes 00/00/0000 Widely featured in novels, movies, and other media, black holes are not just entertaining plot devices, they're real. Learn how the idea of black holes was proposed more than two centuries ago, and how more recently Einstein's general theory of relativity gave a firm theoretical basis for them.
S01E02 The Violent Deaths of Massive Stars 00/00/0000 Discover how black holes can form from stars that are much more massive than the sun. After exhausting their nuclear fuel, these behemoths end in a colossal explosion called a supernova, leaving behind a superdense neutron star, or in some cases something even denser: a black hole.
S01E03 Gamma-Ray Bursts—The Birth of Black Holes 00/00/0000 Trace the story of gamma-ray bursts. Long a mystery, these intense eruptions of high-energy radiation from random spots in the sky are now thought to be associated with the formation of black holes in distant galaxies. Their visibility from so far away means they are truly titanic explosions.
S01E04 Searching for Stellar-Mass Black Holes 00/00/0000 If black holes emit no light, how are they detected? Investigate the different clues that establish strong evidence for black holes. For example, a star orbiting an unseen object that exceeds the 3-solar-mass limit for neutron stars is probably circling a black hole.
S01E05 Monster of the Milky Way and Other Galaxies 00/00/0000 This lecture presents the most compelling evidence to date for black holes—found in the core of most galaxies. There, stars and gas clouds typically orbit at high speeds, signaling the presence of a central, supermassive black hole, millions to billions of times the mass of the sun.
S01E06 Quasars—Feasting Supermassive Black Holes 00/00/0000 Quasars are another astronomical mystery explained by black holes. Explore the history of these star-like objects that long baffled astronomers, until observers realized they were seeing matter falling into supermassive black holes during the early era of galaxy formation.
S01E07 Gravitational Waves—Ripples in Space-Time 00/00/0000 Gravity waves are an unexplored new window for studies of black holes. Learn how these hard-to-detect vibrations are the predicted ripples in the fabric of space-time that should result from violent phenomena such as the merging of two black holes.
S01E08 The Wildest Ride in the Universe 00/00/0000 What happens if you fall into a black hole? Take a wild ride into the supermassive black hole at the center of the Milky Way Galaxy with a vivid computer simulation showing the strange effects you would experience before being crushed to incredible density.
S01E09 Shortcuts through the Universe and Beyond? 00/00/0000 Mathematically, black holes seem to connect our universe with others through a gateway called an Einstein-Rosen bridge—nicknamed a wormhole by physicist John Wheeler, who also coined the term black hole. See a computer simulation of what passage through a wormhole would be like
S01E10 Stephen Hawking and Black Hole Evaporation 00/00/0000 Learn why black holes may not be completely black. In 1975, physicist Stephen Hawking showed that they can evaporate via a quantum tunneling process, giving off a slow trickle of quantum particles before eventually ending in an explosion of gamma rays.
S01E11 Black Holes and the Holographic Universe 00/00/0000 The "no-hair" theorem says that black holes are utterly simple and preserve almost no information about what went into them. Discover why some physicists believe that the supposedly lost information is contained just outside the black hole in a form that resembles a hologram—and that the universe as a whole may display the same property
S01E12 Black Holes and the Large Hadron Collider 00/00/0000 Professor Filippenko closes by looking at the possibility that a new particle accelerator called the Large Hadron Collider will produce microscopic black holes. Discover why there is no danger that they will devour the Earth, and why there is no risk from any known black holes in space.

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