What is 21-cm radiation? What (and who) produces it? What causes it, and what does it tell us about the universe? I discuss these questions and more in today’s Ask a Spaceman! Support the show: <a href= "http://www.patreon.com/pmsutter">http://www.patreon.com/pmsutter</a> All episodes: <a href= "http://www.askaspaceman.com/">http://www.AskASpaceman.com</a> Follow on X: <a href= "https://x.com/PaulMattSutter">https://x.com/PaulMattSutter</a> Read a book: <a href= "http://www.pmsutter/book">http://www.pmsutter/book</a> Keep those questions about space, science, astronomy, astrophysics, physics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE! Big thanks to my top Patreon supporters this month: Justin G, Chris L, Alberto M, Duncan M, Corey D, Michael P, Naila, Sam R, John S, Joshua, Scott M, Rob H, Scott M, Louis M, John W, Alexis, Gilbert M, Rob W, Jessica M, Jules R, Jim L, David S, Scott R, Heather, Mike S, Pete H, Steve S, wahtwahtbird, Lisa R, Couzy, Kevin B, Michael B, Aileen G, Toho Warrior, Steven W, Brian O, Mark R, Alan B, Craig B, Mark F, Richard K, Stace J, Stephen J, Joe R, David P, Robert B, Sean M, Tracy F, Sarah K, Ella F, Thomas K, James C, Syamkumar M, Homer V, Mark D, Bruce A, Bill E, Tim Z, Linda C, The Tired Jedi, Gary K, David W, dhr18, Lode D, Bob C, Red B, Stephen A, James R, Robert O, Lynn D, Allen E, Michael S, Reinaldo A, Sheryl, David W, Sue T, Josephine K, Chris, Michael S, Erlend A, James D, Larry D, Matt K, Charles, Karl W, Den K, George B, Tom B, Edward K, Catherine B, John M, Craig M, and Scott K! Hosted by <a href="https://pmsutter.com">Paul M. Sutter</a>.

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