The big question in the comments last week was, "BUT WHAT ABOUT ECLIPSES?" Today, Phil breaks 'em down for you. This episode is sponsored by Squarespace: Check out the Crash Course Astronomy solar system poster here: -- As promised, Phil's sun spotting recommendations: Astronomers Without Borders (charitable org): Rainbow Symphony glasses: Wide variety of viewers from Rainbow Symphony: -- Chapters: Introduction 00:00 How Do Solar Eclipses Work? 0:52 Umbra & Penumbra 2:04 The Sun's Corona 3:17 Solar Eclipse Totality 4:14 Annular Eclipse 5:09 Can You Look at a Solar Eclipse? 5:32 Lunar Eclipses 6:54 Size of the Earth and Moon 8:24 Review 9:27 -- PBS Digital Studios: Follow Phil on Twitter: Crash Course is on Patreon! You can support us directly by signing up at Want to find Crash Course elsewhere on the internet? Facebook - Twitter - Instagram - CC Kids: -- PHOTOS/VIDEOS #.VMFSKGTF_Z0 #mediaviewer/File: ,_2006#mediaviewer/File:Helder_da_Rocha_-_Partial_solar_eclipse_(by-sa).jpg : #mediaviewer/File: #mediaviewer/File: ,_Nevada_on_May_20, : : #mediaviewer/File: