How did they actually take this picture? (Very Long Baseline Interferometry)

This is an image of the supermassive black hole, Sagittarius A*, at the center of our Milky Way galaxy. Visit https://www.kiwico.com/veritasium30 to get 30% off your first month of any crate! ▀▀▀ Image of Sgr A* from EHT collaboration Event Horizon Telescope collaboration: https://ve42.co/EHT Animations from The Relativistic Astrophysics group, Institute for Theoretical Physics, Goethe-Universität Frankfurt. Massive thanks to Prof. Luciano Rezzolla, Dr Christian Fromm and Dr Alejandro Cruz-Osorio. A huge thanks to Prof. Peter Tuthill and Dr Manisha Caleb for feedback on earlier versions of this video and helping explain VLBI. Great video by Thatcher Chamberlin about VLBI here –    • Very Long Baseline Interferometry & the Bl...   Animations and simulations with English text: L. R. Weih & L. Rezzolla (Goethe University Frankfurt)    • Accretion flow onto a Kerr Black Hole and ...   Video of stars going around Sgr A* from European Southern Observatory https://www.eso.org/public/videos/eso... Video zooming into the center of our galaxy from European Southern Observatory    • Zooming into the black hole at the centre ...   Video of observation of M87 courtesy of: C. M. Fromm, Y. Mizuno & L. Rezzolla (Goethe University Frankfurt)    • Using VLBI to create an Image of the black...   Video of observation of SgrA* courtesy of C. M. Fromm, Y. Mizuno & L. Rezzolla (Goethe University Frankfurt) Z. Younsi (University College London)    • Using VLBI to create an Image of the black...   Video of telescopes in the array 2017: C. M. Fromm & L. Rezzolla (Goethe University Frankfurt)    • Telescopes in the Event Horizon Telescope ...   Animations and simulations (no text): L. R. Weih & L. Rezzolla (Goethe University Frankfurt)    • Accretion flow onto a Kerr Black Hole and ...   ▀▀▀ Special thanks to Patreon supporters: Inconcision, Kelly Snook, TTST, Ross McCawley, Balkrishna Heroor, Chris LaClair, Avi Yashchin, John H. Austin, Jr., OnlineBookClub.org, Dmitry Kuzmichev, Matthew Gonzalez, Eric Sexton, john kiehl, Anton Ragin, Diffbot, Micah Mangione, MJP, Gnare, Dave Kircher, Burt Humburg, Blake Byers, Dumky, Evgeny Skvortsov, Meekay, Bill Linder, Paul Peijzel, Josh Hibschman, Mac Malkawi, Michael Schneider, jim buckmaster, Juan Benet, Ruslan Khroma, Robert Blum, Richard Sundvall, Lee Redden, Vincent, Stephen Wilcox, Marinus Kuivenhoven, Clayton Greenwell, Michael Krugman, Cy 'kkm' K'Nelson, Sam Lutfi, Ron Neal ▀▀▀ Written by Derek Muller Animation by Ivy Tello, Mike Radjabov, Maria Raykova Thumbnail by Ignat Berbeci Filmed by Petr Lebedev