According to Einstein's special theory of relativity, there is no such thing as a moment in time spread throughout the universe. Instead, time is one of four dimensions in spacetime. Learn how this "relative" view of time is usefully diagramed with light cones, representing the past and future. From the series: Mysteries of Modern Physics: Time www.wondrium.com/youtube/mysteries-of-modern-physics-time 0:00 Understanding Cosmology, Gravity, and Relativity 1:00 Taking a Four-Dimensional Viewpoint of Relativity 2:15 Moving Into a Space-Time View of Reality 3:40 Differences Between a Newtonian and Einsteinian View of the Universe 4:45 The Notion of Simultaneity 5:55 Einstein’s Clocks, Poincaré’s Maps by Peter Galison 6:05 Recurrence Theorem 8:00 Einstein's Clock Patents 8:45 Constructing the Present Moment 10:40 Why Space-Time Is Relative 14:00 What is a Muon? 15:00 Carl Anderson Discovers Muons 15:50 Why Do the Muons Reach Us Before Decaying? 18:30 Einstein's Notion of Time as Personal 20:30 What Are Light Cones? 24:20 Time Dilation and Length Contraction 27:00 How Einstein Conceptualizes Space-Time 28:00 Newtonian Rule for Time Travel 28:45 Implications of Relativity ------------------------------------------- The Great Courses is the global leader in lifelong learning and our video-on-demand service The Great Courses Plus gives you unlimited, uninterrupted access to a world of learning anytime and anywhere you want it. With courses on thousands of topics, you are sure to find something that will ignite your curiosity and invigorate your passion for learning. **Check us out for FREE by going to www.wondrium.com/youtube/lp/t2/generic?utm_source=Video&utm_medium=Youtube&utm_campaign=1000812 ** In the meantime, enjoy free lectures, course trailers, professor interviews, video clips, and more by subscribing to our YouTube channel. We add new videos all the time. You won’t want to miss a moment! ------------------------------------------- And don't forget to SUBSCRIBE TO OUR CHANNEL - new videos are being added all the time! www.youtube.com/subscription_center?add_user=wondrium ------------------------------------------- JOIN OUR COMMUNITY OF LIFELONG LEARNERS & BECOME A PART OF THE CONVERSATION: -YouTube: www.youtube.com/user/wondrium -Twitter: twitter.com/wondrium -Facebook: www.facebook.com/wondrium -Instagram: www.instagram.com/wondrium/ -LinkedIn: www.linkedin.com/company/the-great-courses-by-the-teaching-company -Blog: www.thegreatcoursesdaily.com/ ------------------------------------------- #physics #theoryofrelativity #Einstein

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