Video · Galaxies, part 2: Crash Course Astronomy #39 TwitterShare on Facebook5K 463 800 views Crash Course - November 5, 2015 Science Crash Course More Videos Earthquakes Explained: Crash Course Geology #14 Science · 22 hours ago Earthquakes Explained: Crash Course Geology #14 Science · 22 hours ago Volcanoes Explained: Crash Course Geology #13 Science · 2 weeks ago The Deepest Point in the World: Crash Course Geology #12 Science · 3 weeks ago How Do Mountains Form?: Crash Course Geology #11 Science · July 9, 2026 What is Plate Tectonics: Crash Course Geology #10 Science · June 25, 2026 What is Plate Tectonics: Crash Course Geology #10 Science · June 25, 2026 How Water Shapes the Land: Crash Course Geology #9 Science · June 18, 2026