Ethan Siegel is a theoretical astrophysicist and science communicator. He received his PhD from the University of Florida and held academic positions at the University of Arizona, University of Oregon, and Lewis & Clark College before moving on to become a full-time science writer. Ethan is the author of the book Beyond The Galaxy, which is the story of “How Humanity Looked Beyond Our Milky Way And Discovered The Entire Universe” and he has contributed numerous articles to ScienceBlogs, Forbes, and BigThink. Today, Ethan is the face and personality behind Starts With A Bang, both a website and podcast by the same name that is dedicated to explaining and exploring the deepest mysteries of the cosmos.In this episode, Ethan and I discuss the mysterious nature of dark matter: the evidence for it and the proposals for what it might be.Patreon: https://www.patreon.com/timothynguyenPart I. IntroductionPart II. Ordinary MatterPart III. Dark MatterImage Credits: http://timothynguyen.org/image-credits/Further learning:E. Siegel. Beyond the GalaxyEthan Siegel's webpage: www.startswithabang.com More Ethan Siegel & Timothy Nguyen videos:Brian Keating’s Losing the Nobel Prize Makes a Good Point but …https://youtu.be/iJ-vraVtCzwTesting Eric Weinstein's and Stephen Wolfram's Theories of Everythinghttps://youtu.be/DPvD4VnD5Z4 Twitter: @iamtimnguyenWebpage: http://www.timothynguyen.org