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Ground News Holiday Sale: Compare news coverage. Spot media bias. Join Ground News today to get 40% off unlimited access: https://ground.news/scienceasylum. Sale ends December 31. The speed you know is only your spatial speed, but you also have a speed through time. The two together make something called a 4-velocity and its size is always the speed of light. Nick Lucid - Host, Writer, Editor, Animator Em Lucid - Producer ________________________________ VIDEO ANNOTATIONS/CARDS Speed of Light is Infinite: https://youtu.be/vPi1lyAx4ws ________________________________ RELATED YOUTUBE VIDEOS ScienceClic on 4-Velocity: https://youtu.be/au0QJYISe4c PBS Space Time on 4-Velocity: https://youtu.be/P4rW_pPbD-U ________________________________ SUPPORT THE SCIENCE ASYLUM Patreon: http://www.patreon.com/ScienceAsylum YouTube Membership: https://www.youtube.com/channel/UCXgNowiGxwwnLeQ7DXTwXPg/join Advanced Theoretical Physics (Paperback): http://www.lulu.com/shop/nick-lucid/advanced-theoretical-physics-a-historical-perspective/paperback/product-24250687.html Advanced Theoretical Physics (eBook): https://gumroad.com/l/ubSc Merchandise: https://www.scienceasylum.com ________________________________ HUGE THANK YOU TO THESE SUPPORTERS Asylum Orderlies: Dhruv Singhal, Medec Hurtz Einsteinium Crazies: Benjamin Sharef, Eoin O'Sullivan, Jonathan Lima, Joseph Salomone, Kevin Flanagan, Sean K, YouTubeviewer2014 Plutonium Crazies: Al Davis, Compuart, Ellis Hall, Fabio Manzini, Kevin MacLean, Rick Myers, Vid Icarus Platinum Crazies: Clayton Bruckert, David Johnston, Jonathan Reel, Joshua Gallagher, Marino Hernandez, Mikayla Eckel Cifrese, Mr. Orn Jonasar, Olga Cooperman, Thomas V Lohmeier ________________________________ ADDITIONAL READING http://hyperphysics.phy-astr.gsu.edu/hbase/Relativ/vec4.html ________________________________ LINKS TO COMMENTS https://www.youtube.com/watch?v=tgenS5vxe4M&lc=UgzXy13eBX1RwzZTOlN4AaABAg https://www.youtube.com/watch?v=tgenS5vxe4M&lc=UgzqaJaN9oy8aUr329x4AaABAg https://www.youtube.com/watch?v=tgenS5vxe4M&lc=UgwDxyd-R8e2z5_b03B4AaABAg https://www.youtube.com/watch?v=tgenS5vxe4M&lc=Ugya8tB2hU7E6ErmN0x4AaABAg ________________________________ IMAGE/VIDEO CREDITS Rene Descartes: https://commons.wikimedia.org/wiki/File:Frans_Hals_-_Portret_van_Ren%C3%A9_Descartes.jpg ________________________________ TIME CODES 00:00 Cold Open 00:37 Introduction 00:48 3D Velocity 01:31 What is a Tangent? 02:12 What is Speed? 02:46 Coordinate System 03:47 4D Spacetime 04:18 4-Velocity is just like 3-Velocity 04:57 Mathematical Definition 05:43 The 2 Points of View 06:23 Intuition 07:24 What about Photons? 08:08 Summary 08:26 Sponsor Message 09:48 Outro 09:54 Featured Comment