What Is Time? | Professor Sean Carroll Explains Presentism and Eternalism

It's said that the clock is always ticking, but there's a chance that it isn't. The theory of "presentism" states that the current moment is the only thing that's real, while "eternalism" is the belief that all existence in time is equally real. Find out if the future is really out there and predictable—just don't tell us who wins the big game next year. This video is episode two from the series "Mysteries of Modern Physics: Time," presented by Sean Carroll. Learn more about the physics of time at https://www.thegreatcourses.com/youtube. 00:00 Science and Philosophy Combine When Studying Time 2:30 Experiments Prove Continuity of Time 6:47 Time Is Somewhat Predictable 8:10 Why We Think of Time Differently 8:49 Our Perception of Time Leads to Spacetime 11:54 We Dissect Presentism vs Eternalism 15:43 Memories and Items From the Past Make it More Real 17:47 Galileo Discovers Pendulum Speeds Are Identical 25:00 Thought Experiment: “What if Time Stopped?” 29:07 Time Connects Us With the Outside World ------------------------------------------- Welcome to The Great Courses on YouTube. Here, you can enjoy a diverse sampling of educational videos from our extensive library of courses, all taught by some of the world’s greatest professors and subject matter experts. If you are enjoying these videos, you can discover more amazing Great Courses content with ad-free, unlimited streaming of thousands of lectures on subjects ranging from history, science, art, philosophy, and literature to professional development, health and wellness, world travel, hobbies, and so much more with The Great Courses streaming services. With four services to choose from, there’s a Great Courses membership that’s right for you. Discover your perfect fit at https://www.thegreatcourses.com/youtube.