How GRAVITATIONAL Lensing Maps the Universe We Cannot See скачать в хорошем качестве

How GRAVITATIONAL Lensing Maps the Universe We Cannot See

Most of the universe cannot be seen, yet its structure can be measured. The clearest map of that hidden mass comes from watching light change course as it crosses warped spacetime. What Gravitational Lensing Reveals About Invisible Cosmic Structure begins with Einstein’s general relativity and the 1919 Eddington result, then follows how foreground galaxies and clusters bend light from distant quasars and galaxies into arcs, multiple images, and Einstein rings. It examines strong lensing in systems such as Abell 1689, weak lensing across galaxy surveys that trace dark matter halos and the cosmic web, and microlensing events that uncover rogue planets, black holes, and other compact objects. The video also looks closely at the Bullet Cluster, where X-ray gas separates from the mass map, providing direct evidence that dark matter is collisionless and distinct from ordinary matter. From Hubble and JWST to Euclid and the Vera C. Rubin Observatory’s LSST, these observations weigh galaxy clusters, test particle models of dark matter, probe cosmic dawn, and refine measurements of the Hubble constant through time-delay cosmology. #Space #Cosmology #DarkMatter #EinsteinRing #BulletCluster #CosmicWeb #Euclid #LSST Subscribe for consistent content.    / @deepskycompass   Start here next 👇 Worth a watch: "Inflation Fixed the Big Bang and Left a Deeper Cosmic Problem" —    • Inflation Fixed the Big Bang and Left a De...   Worth a watch: "A Seconds-Long Signal Put GOLD and Platinum in a New Light" —    • A Seconds-Long Signal Put GOLD and Platinu...   Worth a watch: "ROGUE Planets That Cross the Galaxy Without Any Star to Hold Them" —    • ROGUE Planets That Cross the Galaxy Withou...   00:00 The Universe's Hidden Secret 02:00 Einstein's Theory of General Relativity 04:39 Eddington's 1919 Solar Eclipse Test 06:16 How a Gravitational Lens Works 08:19 Einstein Rings and Strong Lensing 11:36 Weak Gravitational Lensing Explained 14:07 Microlensing and Rogue Planets 17:09 Evidence for Dark Matter 20:24 Weighing Galaxy Clusters 22:28 The Bullet Cluster Collision 26:44 Mapping a Single Galaxy's Dark Halo 29:55 Charting the Cosmic Web 33:06 Probing Dark Matter's Particle Nature 36:27 Lensing as a Natural Telescope 39:23 Time Delay Cosmography 42:35 Discovering Exoplanets With Microlensing 45:32 The Technical Challenge of Weak Lensing 49:11 The Vera C. Rubin Observatory 52:50 Space Telescopes: Hubble, Webb, and Euclid 56:31 Challenges and Systematic Biases 01:01:02 Lensing of the Cosmic Microwave Background 01:05:23 Four-Dimensional Lensing 01:07:41 Multi-Messenger Astronomy 01:09:54 Gravity as Our Guide to the Cosmos