https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/xcdef9704:special-relativity/v/introduction-to-special-relativity-and-minkowski-spacetime-diagrams 2021-02-07T17:14:00Z Introduction to special relativity and Minkowski spacetime diagrams Including multiple observers in the "most obvious" way led to some problems. Let's see how we can start to solve those problems by introducing (what we'll later call) Minkowski spacetime diagrams. video https://cdn.kastatic.org/googleusercontent/FbOshy02fUW81CIfE-LTaXciRSgc2uu6szRdcYr7stur-TTi2VE6FvnX6Dz-2aL952k0kQGH3mym1C9RZgb8c26o Introduction to special relativity and Minkowski spacetime diagrams Including multiple observers in the "most obvious" way led to some problems. Let's see how we can start to solve those problems by introducing (what we'll later call) Minkowski spacetime diagrams. https://cdn.kastatic.org/ka-youtube-converted/ii-KBKSODek.mp4/ii-KBKSODek.mp4 824 Space time in relativity: the fourth dimension and Its physical effects https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/xcdef9704:special-relativity/v/light-and-the-luminiferous-ether 2021-02-07T17:14:00Z Light and the luminiferous ether If waves are disruptions traveling through a medium and light is a wave, what medium does it travel through? A luminiferous ether?  video https://cdn.kastatic.org/googleusercontent/6mEB-GomUNieWxedf5HZe2wC695BIlupwfY-xvbcyL6UVxa2fdb-i7PefKzHsN8Inoum4C1zJ09r7Lm1nkHtL52rhQ Light and the luminiferous ether If waves are disruptions traveling through a medium and light is a wave, what medium does it travel through? A luminiferous ether?  https://cdn.kastatic.org/ka-youtube-converted/iAPYsOaq-VY.mp4/iAPYsOaq-VY.mp4 478 Space time in relativity: the fourth dimension and Its physical effects https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/xcdef9704:special-relativity/v/potential-ways-to-detect-an-ether-wind 2021-02-07T17:14:00Z Potential ways to detect an ether wind Thinking about how Earth's relative velocity to hypothetical luminiferous ether can be used to detect ether. video https://cdn.kastatic.org/googleusercontent/__plX8CbjPMX-WGGow8RkKBLrWqZvdTptAI_fUvqedyWEg7wiZ7-JYFoOk0KwKnCRs5skP1nrRVa5tzc-dVfSTVH Potential ways to detect an ether wind Thinking about how Earth's relative velocity to hypothetical luminiferous ether can be used to detect ether. https://cdn.kastatic.org/ka-youtube-converted/88hs5LcCoX4.mp4/88hs5LcCoX4.mp4 444 Space time in relativity: the fourth dimension and Its physical effects https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/xcdef9704:special-relativity/v/michelson-morley-experiment-introduction 2021-02-07T17:14:01Z Michelson–Morley Experiment introduction Simple idea behind the Michelson‒Morley experiment to detect ether wind. video https://cdn.kastatic.org/googleusercontent/X2-pD1D_CPMFu5VHeyVG6uVmSA86HI_3NLLOUbGILU8inNMm7c-d6Awh7kZKpXnDLp5lxUKjW4vr235M-auhoD3Z Michelson–Morley Experiment introduction Simple idea behind the Michelson‒Morley experiment to detect ether wind. https://cdn.kastatic.org/ka-youtube-converted/3G_Q6AggQF8.mp4/3G_Q6AggQF8.mp4 492 Space time in relativity: the fourth dimension and Its physical effects https://www.khanacademy.org/college-careers-more/bjc/x4c51c62a:2020-challenge/x4c51c62a:2020-challenge-finalists/v/the-theory-of-general-relativity 2021-02-05T04:26:55Z The Theory of General Relativity By Atticus Fehr. Country: USA. Finalist: 2020 Breakthrough Junior Challenge video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw The Theory of General Relativity By Atticus Fehr. Country: USA. Finalist: 2020 Breakthrough Junior Challenge https://cdn.kastatic.org/ka-youtube-converted/Ah2Ohqf5ohk.mp4/Ah2Ohqf5ohk.mp4 180 Space time in relativity: the fourth dimension and Its physical effects