How Did the Milky Way Get Its Spiral?

This episode is brought to you by EnergySage, the nation’s most trusted online solar marketplace. Head to https://communitysolar.energysage.com/?rc=cp-scishowspace to see what community solar options are available in your area. With community solar, you can subscribe to a share of a solar farm and immediately start saving on your utility bill. No equipment needed! Most galaxies that we know of are spirals, including the Milky Way, but how do they form and keep their shape over billions of years? Hosted by: Hank Green SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at http://www.scishowtangents.org ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Silas Emrys, Charles Copley, Jb Taishoff, Jeffrey Mckishen, James Knight, Christoph Schwanke, Jacob, Matt Curls, Christopher R Boucher, Eric Jensen, LehelKovacs, Adam Brainard, Greg, Ash, Sam Lutfi, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, charles george, Alex Hackman, Chris Peters, Kevin Bealer ---------- 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://earthsky.org/space/how-do-spiral-galaxies-keep-their-shape https://astronomy.swin.edu.au/cosmos/S/Spiral+Galaxy+Formation https://www.nasa.gov/feature/how-to-shape-a-spiral-galaxy http://web.cn.edu/jburton/Astronomy/formationofMilkyWay.htm https://www.scientificamerican.com/article/what-process-creates-and/ https://www.scientificamerican.com/article/how-did-scientists-determ/ https://arxiv.org/abs/1608.00969 http://www.sci-news.com/astronomy/magnetic-fields-spiral-galaxies-07894.html https://arxiv.org/abs/1907.06648 https://www.eso.org/sci/meetings/2015/Rainbows2015/Talk_Files/DAY3/WeggC.pdf http://articles.adsabs.harvard.edu/pdf/1964ApJ...140..646L Images: https://hubblesite.org/science/galaxies https://esahubble.org/images/heic0910i/ https://svs.gsfc.nasa.gov/13155 https://beltoforion.de/en/spiral_galaxy_renderer/ https://www.nasa.gov/feature/how-to-shape-a-spiral-galaxy https://esahubble.org/images/heic1202a/ https://esahubble.org/images/heic2002a/ https://simple.wikipedia.org/wiki/File:Morgan-Keenan_spectral_classification.png https://esahubble.org/images/heic0910s/ https://esahubble.org/images/opo0501a/ https://esahubble.org/images/potw1801a/ https://esahubble.org/images/heic1107a/


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