How Do We Know What the Milky Way Looks Like?

How do we know what the Milky Way looks like if we ve never been outside of it? Hosted by: Caitlin Hofmeister ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters—we couldn t make SciShow without them! Shoutout to Kevin Bealer, Mark Terrio-Cameron, KatieMarie Magnone, Patrick Merrithew, Charles Southerland, Fatima Iqbal, Benny, Kyle Anderson, Tim Curwick, Scott Satovsky Jr, Will and Sonja Marple, Philippe von Bergen, Bella Nash, Bryce Daifuku, Chris Peters, Patrick D. Ashmore, Charles George, Bader AlGhamdi ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: https://archive.org/stream/workstranslatedi03arisuoft#page/n41/mode/2up https://www.scientificamerican.com/article/how-did-scientists-determ/ https://books.google.com/books?id=IU9FAAAAcAAJ&pg=PA213#v=onepage&q&f=false https://www.e-education.psu.edu/astro801/content/l8_p3.html https://www.sdss3.org/press/milkywaybar.php http://plato.stanford.edu/entries/ibn-bajja/ http://www.atnf.csiro.au/outreach/education/everyone/radio-astronomy/index.html Image Links: https://en.wikipedia.org/wiki/Milky_Way#/media/File:ESO_-_The_Milky_Way_panorama_(by).jpg https://en.wikipedia.org/wiki/Milky_Way#/media/File:Herschel-Galaxy.png https://commons.wikimedia.org/wiki/File:AustraliaSky.jpg https://commons.wikimedia.org/wiki/File:Artist%27s_impression_of_the_Milky_Way_(updated_-_annotated).jpg https://en.wikipedia.org/wiki/William_Herschel#/media/File:William_Herschel01.jpg https://www.e-education.psu.edu/astro801/content/l8_p3.html https://commons.wikimedia.org/wiki/File:HarlowShapely-crop.jpeg https://en.wikipedia.org/wiki/Globular_cluster#/media/File:A_Swarm_of_Ancient_Stars_-_GPN-2000-000930.jpg https://commons.wikimedia.org/wiki/File:Edwin-hubble.jpg https://commons.wikimedia.org/wiki/File:An_Infrared_View_of_the_Galaxy.jpg https://commons.wikimedia.org/wiki/File:GCRT_J1745-3009_2.jpg https://commons.wikimedia.org/wiki/File:Artist%E2%80%99s_impression_of_the_Milky_Way.jpg