Today on Crash Course Astronomy, Phil invites you to head outside and take a look at all the incredible things you can see with your naked eye. Check out the Crash Course Astronomy solar system poster here: null -- Chapters: Introduction: Naked Eye Observations 00:00 Classifying Stars by Magnitude 2:08 Star Colors 2:24 Constellations 3:09 Names of Stars 4:34 Light Pollution 5:16 Why Do Stars Twinkle? 6:40 Naked-Eye Planets 7:07 The Sky's Motion 7:25 Which Stars Can We See? 9:34 Review 10:30 -- PBS Digital Studios: null Follow Phil on Twitter: https://twitter.com/badastronomer -- Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: null -- PHOTOS http://www.eso.org/public/images/potw1333a/ http://commons.wikimedia.org/wiki/File:3_Solar_Interstellar_Neighborhood_(ELitU).png http://www.spacetelescope.org/images/heic0206j/ http://www.spacetelescope.org/images/heic0720c/ http://upload.wikimedia.org/wikipedia/commons/3/36/Orion_tjt.jpg http://hubblesite.org/newscenter/archive/releases/1996/04 http://en.wikipedia.org/wiki/Delphinus#mediaviewer/File:Delphinus_IAU.svg http://en.wikipedia.org/wiki/Scorpius#mediaviewer/File:Sidney_Hall_-_Urania%27s_Mirror_-_Scorpio.jpg http://en.wikipedia.org/wiki/Category:Pisces_(constellation)#mediaviewer/File:Pisces_constellation_map.png http://en.wikipedia.org/wiki/Alpha_Cancri#mediaviewer/File:Cancer_constellation_map.png http://en.wikipedia.org/wiki/GLOBE_at_Night#mediaviewer/File:Light_pollution_It%27s_not_pretty.jpg http://solarsystem.nasa.gov/multimedia/display.cfm?IM_ID=7543 http://photojournal.jpl.nasa.gov/catalog/PIA00104 http://www.esa.int/spaceinimages/Images/2007/02/True-colour_image_of_Mars_seen_by_OSIRIS http://photojournal.jpl.nasa.gov/jpeg/PIA04866.jpg http://photojournal.jpl.nasa.gov/catalog/PIA06193 http://commons.wikimedia.org/wiki/File:Star_Trails_over_the_VLT_in_Paranal.jpg http://imgsrc.hubblesite.org/hu/db/images/hs-2006-02-a-print.jpg http://en.wikipedia.org/wiki/Circumpolar_star#mediaviewer/File:Circumpolar_AZ81.jpg