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Venus is a gorgeous naked-eye planet, hanging like a diamond in the twilight -- but it’s beauty is best looked at from afar. Even though Mercury is closer to the sun, Venus is the hottest planet in the solar system, due to a runaway greenhouse effect, and has the most volcanic activity in the solar system. Its north and south poles were flipped, causing it to rotate backwards and making for very strange days on this beautiful but inhospitable world. This episode is brought to you by Squarespace http://www.squarespace.com/crashcourse -- Table of Contents Venus’s Size and Atmosphere 3:09 Hottest Planet in the Solar System 4:04 Slow Clockwise Rotation 6:02 Tremendous Volcanic Activity 8:31 -- PBS Digital Studios: http://youtube.com/pbsdigitalstudios Follow Phil on Twitter: https://twitter.com/badastronomer Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support CrashCourse on Patreon: http://www.patreon.com/crashcourse -- PHOTOS/VIDEOS Naked-eye Venus photo taken by Phil Plait Phases of Venus http://commons.wikimedia.org/wiki/File:Phases-of-Venus2.jpg [credit: Wikimedia Commons] 2012 Venus Transit https://www.youtube.com/watch?v=34mXua1n_FQ [credit: NASA] Black drop effect in 2004 http://en.wikipedia.org/wiki/Black_drop_effect#mediaviewer/File:BlackDrop-Venus-Transit.jpg [credit: Vesta] Venus Transit http://www.nasa.gov/images/content/657111main_1-SOT_120606_venus_ca_nc_yellow_001_color_full.jpg [credit: JAXA/NASA/Lockheed Martin] Venus in real colors http://en.wikipedia.org/wiki/Venus#mediaviewer/File:Venus-real_color.jpg [credit: NASA] Earth http://visibleearth.nasa.gov/view.php?id=57723 [credit: NASA Goddard Space Flight Center, Image by Reto Stöckli] Venus http://www.msss.com/images/science/venus180hem_magellan_big.jpg [credit: NASA/JPL-Caltech/Magellan Project] Atmospheric Drag on Venus https://www.youtube.com/watch?v=aRAonBSIBck [credit: NASA] Lakshmi Planum and Maxwell Montes http://en.wikipedia.org/wiki/Venus_snow#mediaviewer/File:Maxwell_Montes_of_planet_Venus.jpg [credit: NASA/JPL] Artist's impression of the surface of Venus http://sci.esa.int/science-e-media/img/59/VenusSurface.jpg [credit: ESA] Venera Images http://planetimages.blogspot.com/ [credit: Ted Stryk] Venus Globe http://en.wikipedia.org/wiki/Venus#mediaviewer/File:Venus_globe.jpg [credit: NASA] Impact craters on the surface of Venus http://en.wikipedia.org/wiki/Venus#mediaviewer/File:Mgn_p39146.png [credit: Wikimedia Commons] Idunn Mons http://photojournal.jpl.nasa.gov/figures/PIA13001_fig1.jpg [credit: NASA/JPL-Caltech/ESA] Pancake Volcanoes http://en.wikipedia.org/wiki/Pancake_dome#mediaviewer/File:PIA00084_Eistla_region_pancake_volcanoes.jpg [credit: NASA/Jet Propulsion Laboratory]