Rachel Hunter's Tour of Beauty
Date de parution : 26 août 2015
| Saison 1 - épisode 1 | Fundamental Building Blocks Scientists now have a complete inventory of the universe, which is composed of three basic constituents: Ordinary matter includes every kind of... | |
| Saison 1 - épisode 2 | The Smooth, Expanding Universe Imagine looking into a clear night sky with perfect vision. What would you see? This lecture surveys the visible universe—from the stars in our... | |
| Saison 1 - épisode 3 | Space, Time, and Gravity Einstein taught us that space and time can be combined into spacetime, which has the ability to evolve and grow. Indeed, what we think of as gravity... | |
| Saison 1 - épisode 4 | Galaxies and Clusters Applying the laws of dynamics to galaxies and galaxy clusters, we find that more matter is required to account for their motions than can be observed.... | |
| Saison 1 - épisode 5 | Gravitational Lensing Another way to detect invisible matter is to use light as a probe of the gravitational field. Passing through curved spacetime, the path of a light... | |
| Saison 1 - épisode 6 | Atoms and Particles We peer into the atom to discover the constituents of ordinary matter: nuclei and electrons. Nuclei are made of protons and neutrons, which in turn... | |
| Saison 1 - épisode 7 | The Standard Model of Particle Physics In the 1960s and 1970s, physicists developed a comprehensive theory of known fermions and bosons. Now called the standard model, this theory fits an... | |
| Saison 1 - épisode 8 | Relic Particles from the Big Bang Armed with the core principles of particle physics, we know enough about the early universe to predict how many of each type of particle should be... | |
| Saison 1 - épisode 9 | Primordial Nucleosynthesis The process of nucleosynthesis describes how protons and neutrons were assembled into light elements during the first few minutes after the Big Bang.... | |
| Saison 1 - épisode 10 | The Cosmic Microwave Background About 380,000 years after the Big Bang, the universe had cooled sufficiently for electrons and nuclei to combine into atoms allowing light to travel... | |
| Saison 1 - épisode 11 | Dark Stars and Black Holes Candidates for dark matter include small, dark stars called Massive Compact Halo Objects (MACHOs) and black holes. Such objects are ultimately... | |
| Saison 1 - épisode 12 | WIMPs and Supersymmetry Weakly interacting massive particles (WIMPs) are ideal candidates for what comprises dark matter. WIMPs may have their origins in supersymmetry,... | |
| Saison 1 - épisode 13 | The Accelerating Universe In the late 1990s, two groups of astronomers found to their astonishment that the expansion of the universe is speeding up rather than slowing down.... | |
| Saison 1 - épisode 14 | The Geometry of Space Precise measurements of the cosmic microwave background let us measure the total energy density of the universe by observing the geometry of space.... | |
| Saison 1 - épisode 15 | Smooth Tension and Acceleration Dark energy is smoothly distributed throughout the universe and its density is nearly constant, even though the universe is expanding. Unlike gas... | |
| Saison 1 - épisode 16 | Vacuum Energy The density and distribution of dark energy remain the same across all of spacetime, but what exactly is dark energy? There are many possibilities,... | |
| Saison 1 - épisode 17 | Quintessence Another idea about dark energy is that it results from a new field in nature, analogous to the electromagnetic field but remaining persistent as the... | |
| Saison 1 - épisode 18 | Was Einstein Right? We have inferred the existence of dark matter and dark energy from the gravitational fields they cause. In this lecture, we explore proposals that a... | |
| Saison 1 - épisode 19 | Inflation Before we had observational evidence that the universe is accelerating, cosmologists considered the possibility of a period of rapid acceleration at... | |
| Saison 1 - épisode 20 | Strings and Extra Dimensions We know about the dark sector because of gravity, and string theory is an ambitious attempt to unify gravitation with the other forces of nature... | |
| Saison 1 - épisode 21 | Beyond the Observable Universe The speed of light and the age of the observable universe are finite. That means we can't see the whole universe because our vision can only stretch... | |
| Saison 1 - épisode 22 | Future Experiments Astronomers are designing new observatories to probe the acceleration of the universe and other cosmic phenomena. Physicists are also looking... | |
| Saison 1 - épisode 23 | The Past and Future of the Dark Side The concordance cosmology is an excellent fit to a variety of data, but it presents us with deep puzzles: What are dark matter and dark energy? Why... |
