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We All Move At The Speed Of Light… Kind Of.

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:    • The Speed of Light is Infinite... Kin...   ________________________________ RELATED YOUTUBE VIDEOS ScienceClic on 4-Velocity:    • We all move at the Speed of Light   PBS Space Time on 4-Velocity:    • Can You Trust Your Eyes in Spacetime?   ________________________________ SUPPORT THE SCIENCE ASYLUM Patreon:   / scienceasylum   YouTube Membership:    / @scienceasylum   Advanced Theoretical Physics (Paperback): http://www.lulu.com/shop/nick-lucid/a... Advanced Theoretical Physics (eBook): https://gumroad.com/l/ubSc Merchandise: http://shop.spreadshirt.com/scienceas... ________________________________ 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/... ________________________________ LINKS TO COMMENTS    • What Teachers Get Wrong About Equival...      • What Teachers Get Wrong About Equival...      • What Teachers Get Wrong About Equival...      • What Teachers Get Wrong About Equival...   ________________________________ IMAGE/VIDEO CREDITS Rene Descartes: https://commons.wikimedia.org/wiki/Fi... ________________________________ 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