We welcome back Professor Abel Mendez from the University of Puerto Rico to tell us about recent research into data from the Arecibo radio telescope focused on cold hydrogen clouds and a proposed natural explanation for the Big Ear Wow! Signal that we covered in depth in Episode 19. We recommend you download the draft paper so you can follow along. Links: Arecibo Wow! I: An Astrophysical Explanation for the Wow! Signal Our episode (#19) with Big Ear scientist Bob Dixon A previous appearance by Abel Mendez on this podcast. Planetary Habitability Laboratory at the University of Puerto Rico The Arecibo Radio Telescope Collapse The FAST Radio Telescope Astrophysical MASERs (microwave lasers) Harvard & Smithsonian Center for Astrophysics: Masers Population Inversion (Wikipedia) The Hydrogen 21 cm line MASERs, Interstellar and Circumstellar, Theory. Credits Host, editor, producer: Paul Carr Music: Quincas Moreira (Black Swan), George Hrab (Far), Jason Robinson Episode 50 of the Wow! Signal Podcast by Paul Carr is licensed under CC BY 4.0

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