Could our solar system be far less crowded than it used to be, thanks to a barrage of asteroids that pushed the outer planets further out from the Sun? Evidence for this theory was discovered when the Apollo missions brought crystalline rocks back from the Moon. Take some breathing room and stretch out with a new view of the night sky. Presented by Sabine Stanley Learn more about the planets at www.TheGreatCoursesPlus.com 0:00 Late Heavy Bombardment 1:47 Lunar Samples Provide Ages for Impact Basins 3:07 Giant Planets Migrate Their Orbit During Formation 3:54 Nice Model Shows Early Configuration of Outer Planets 6:31 2-to-1 Orbit-Orbit Resonance 8:40 Increased Bombardment Changes Planetary Alignment 9:41 Debate Over Late Heavy Bombardment 11:26 How Moon Samples Can Confirm Early Bombardment ------------------------------------------- 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. Enjoy a curated sampling of our full catalog of content by subscribing to our YouTube channel. We add new history, science, and math videos every week. ------------------------------------------- Read articles from the smartest experts in their fields: www.Thegreatcoursesdaily.com Find us on all our social channels: -Facebook: www.facebook.com/TheGreatCourses -Twitter: twitter.com/thegreatcourses​ -Instagram: www.instagram.com/thegreatcourses ------------------------------------------- #Astronomy #Apollo11 #TheMoonRocks

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