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rotation speed of a spiral galaxy and its baryonic mass. His contributions to cosmology include the quantitative accurate prediction of the amplitude ratio of the first-to-second peak of the acoustic power spectrum of the cosmic microwave background. With his work on low surface brightness galaxies he tested predictions of the Modified Newtonian Dynamics hypothesis, which was proposed as alternative to dark matter, finding notable agreement between theory and observations. The full title of the talk was "Dark Matter and Gravity: What is the Universe made of, and which is calling the shots?". [07:30] - beginning of the presentation [1:01:56] - beginning of the Q&A Spanish version: https://youtu.be/DjyrCrlDoXE The panel of our 'Golden Webinar' consisted of: • Stacy McGaugh – Speaker • Patricio Gonzalez (patricio.gonzalez.interprete@gmail.com) – Interpreter • Thomas H. Puzia – co-host, Faculty at the Institute of Astrophysics (IA) • Elizabeth Artur de la Villarmois – co-host, postdoctoral fellow at IA • Ricardo Acevedo – Q&A manager, outreach team IA • Paul Eigenthaler – postdoctoral research fellow at IA • Rohan Rahatgaonkar – Research Intern at Gemini Observatory • Matthew Taylor – Postdoctoral Research Fellow at the Herzberg Astrophysics, National Research Council of Canada, Victoria, BC • Indranil Banik – Postdoctoral Research Fellow at the University of Bonn • Emanuela Pompei – Astronomer at the European Southern Observatory at La Silla • Davor Krajnović – Astronomer at the Leibniz-Institut für Astrophysik Potsdam (AIP), Potsdam, Germany • Cole Miller – Professor of Astrophysics at the University of Maryland • Paul Hoyningen-Huene – Professor of Philosophy, Institute of Philosophy at the Leibniz Universität Hannover, Germany, and Lecturer at the Department of Economics at Universität Zürich The 'Golden Webinars in Astrophysics' series seeks to bring forefront research in astronomy, astrophysics, and cosmology to the public in the English and Spanish language. Full schedule of the Golden Webinars series: http://tiny.cc/GWA-schedule #goldenwebinars #IAPUC #AstroUC #MOND #gravity #darkmatter #galaxies #universe #structureformation Follow us on: ♥ FACEBOOK: https://www.facebook.com/AstrofisicaUC ♥ INSTAGRAM: https://www.instagram.com/astrouc_ia ♥ TWITTER: https://twitter.com/AstroUC ♥ WEB: http://astro.uc.cl