The Wow! signal lasted roughly 72 seconds in the record. Was it a natural event, interference—or something we still do not understand? What would it mean to hear another intelligence only once? In this cinematic 4K episode of Unknown Origin, Bill Van Nort follows the 1977 Big Ear observation into the search for extraterrestrial intelligence, a human-designed message transmitted from Mars, and the messages humanity has already sent into space. We explore what 6EQUJ5 actually records, why repeat observations matter, A Sign in Space, the Arecibo message, and Voyager's Golden Record. Then we ask a harder question: recognizing a signal might be only the beginning of understanding its sender. Download free transcripts: English + nine languages INTERNATIONAL ACCESS — Watch with subtitles in Español, Português (Brasil), Deutsch, Français, 日本語, हिन्दी, Bahasa Indonesia, العربية and 繁體中文. English narration is retained. Select your subtitle language in the YouTube player settings. Translations were created and reviewed with AI assistance and editorial spot checks; corrections: unknownorigin@epicbmedia.com. If you could send one image and one sound to an unknown intelligence, what would you choose? Tell me in the comments—and why. Subscribe for cinematic stories about UFOs, UAP, alien life, and the human questions behind the unknown. EPISODE 004 — What If We Only Hear Them Once?This standalone episode was released ahead of Episode 003. Episode 003, Something Under the Water, is now available at unknownorigin.transistor.fm. Both stories stand on their own. CHAPTERS00:00 Unknown Origin — opening theme00:18 The Wow! signal: a discovery noticed later05:50 Big Ear and the work of listening12:01 What 6EQUJ5 actually means19:08 Why didn't the signal repeat?26:28 A Sign in Space: a human message from Mars35:16 The Arecibo message and Voyager's Golden Record45:40 If we confirmed a signal, should we answer?54:16 Understanding the intelligence on the other side1:02:53 What the silence leaves us1:07:43 Show theme, sources and visual credits WATCH NEXTUFO Encounters: What Do They Want From Us? — Strieber, Lazar & Operation Pratohttps://youtu.be/OEn-gsSmfZYWould We Recognize Alien Contact? Four Strange UFO Encountershttps://youtu.be/RVGow2hjBa8 LISTEN / READ / CONNECTPodcast, episode notes and transcripts: https://unknownorigin.transistor.fm/Free Field Notes newsletter: https://unknown-origin.kit.com/profileSupport the show: https://www.patreon.com/UnknownOriginPodcastThe $5/month Explorer membership supports production updates and member polls. Full episodes remain free.Stories, corrections and sponsorships: unknownorigin@epicbmedia.com SOURCES & FURTHER READINGJerry Ehman's Wow! signal report: https://www.bigear.org/Wow30th/wow30th.htmWhat 6EQUJ5 means: https://bigear.org/6equj5.htm2025 archival reanalysis: https://arxiv.org/abs/2508.10657Repeating-source analysis: https://arxiv.org/abs/2206.08374Natural-origin hypothesis: https://arxiv.org/abs/2408.08513ESA's A Sign in Space account: https://www.esa.int/ESA_Multimedia/Images/2024/10/Alien_signal_decodedProject and decoding: https://asignin.space/Voyager Golden Record: https://science.nasa.gov/mission/voyager/golden-record-contents/ EVIDENCE & PRODUCTION NOTEThe Wow! signal is not established extraterrestrial communication. Proposed explanations, historical observations, personal belief, analogies and hypothetical contact scenarios are distinguished in the episode. A Sign in Space was designed by humans. The film combines identified archival material, scientific visualizations and labeled illustrative scenes. Generated visuals are not evidence of alien contact. Narration uses Bill's authorized synthetic voice. The 4K presentation includes native 4K motion, upscaled generated stills and archival imagery. Visual material credited on screen includes NASA/JPL-Caltech, NASA Goddard, ESA/STScI collaborators, ESO contributors under CC BY 4.0, and Big Ear/NAAPO material used with permission. Full item-level credits and research references accompany the episode notes. No institutional endorsement is implied. Original source-video soundtracks and Voyager recordings are not used. Original episode score produced with Suno; established Unknown Origin theme supplied by Bill. Created and narrated by Bill Van Nort. Published by EpicB Media LLC. #WowSignal #SETI #UnknownOrigin FULL ITEM-LEVEL CREDITS AND REFERENCESUNKNOWN ORIGINWhat If We Only Hear Them Once? Created and narrated by Bill Van Nort VISUAL SOURCES Earth, Apollo 17 (December 7, 1972). Image courtesy of the Earth Science and Remote Sensing Unit, NASA Johnson Space Center.https://svs.gsfc.nasa.gov/30613 NASA galaxies — NASA's Goddard Space Flight Center/Conceptual Image Lab. artist concept.https://svs.gsfc.nasa.gov/14950 Galaxy traverse — F. Summers, G. Bacon (STScI); Simulation: C. Hummels, P. Hopkins (CalTech), A. Wetzel(UC Davis). simulation visualization. https://svs.gsfc.nasa.gov/31025 Orion in visible light — NASA, ESA, F. Summers, G. Bacon, Z. Levay, J. DePasquale, L. Hustak, L.Frattare, M. Robberto, M. Gennaro (STScI), R. Hurt (Caltech/IPAC), M. Kornmesser (ESA); AcknowledgementA. Fujii, R. Gendler. 3D visualization based on observations. https://svs.gsfc.nasa.gov/30957 Earthlike exoplanet — NASA's Goddard Space Flight Center Conceptual Image Lab. artist concept.https://svs.gsfc.nasa.gov/20248 Icy exoplanet — NASA's Goddard Space Flight Center Conceptual Image Lab. artist concept.https://svs.gsfc.nasa.gov/20248 M13 Hubble image — NASA, ESA, and the Hubble Heritage Team (STScI/AURA); Acknowledgment: C. Bailyn (YaleUniversity), W. Lewin (Massachusetts Institute of Technology), A. Sarajedini (University of Florida), andW. van Altena (Yale University).https://science.nasa.gov/asset/hubble/hubble-acswfpc2-image-of-globular-cluster-m13/ Wow! signal printout — Big Ear Radio Observatory and North American AstroPhysical Observatory (NAAPO).Scan of a copy made after the event; preserved source, editorial crops.https://www.bigear.org/Wow30th/WowL.jpg Voyager Golden Record and cover — NASA/JPL-Caltech.https://science.nasa.gov/resource/voyager-golden-record/ VLT TrackingP. Horálek/ESOhttps://www.eso.org/public/videos/horalek-pao-2017-5/CC BY 4.0 VLT StargazersESO/C. Malin (christophmalin.com)https://www.eso.org/public/videos/uhd-cm-vlt2014-1/CC BY 4.0 ALMA PlateauESO/C. Malin (christophmalin.com)https://www.eso.org/public/videos/uhd-cm-alma-pan2/CC BY 4.0 La Silla AerialG. Hüdepohl (atacamaphoto.com)/ESOhttps://www.eso.org/public/videos/lasilla-drone-2019/CC BY 4.0 Big Ear AerialOhio State University Radio Observatory / NAAPOhttps://www.bigear.org/slideshow/JAHR/JAHR.htmUsed with permission Big Ear photographs, summer 1980 (01, 03, 08, 10, 11, 23, 26)James S. Arthur / Ohio State University Radio Observatory / NAAPOhttps://www.bigear.org/slideshow/JAHR/JAHR.htmUsed with permission Arecibo 2014 Raphael VinotRaphaël Vinothttps://www.flickr.com/photos/rafiot/14725838151/CC BY 2.0; https://creativecommons.org/licenses/by/2.0/ ALMA AntennasI. Nakamura/ESOhttps://www.eso.org/public/videos/alma-array-uhd1/CC BY 4.0 Keck ObservatoryInternational Gemini Observatory/NOIRLab/NSF/AURA/ T. Slovinskýhttps://noirlab.edu/public/images/6V7A4853-CC/CC BY 4.0 Gemini North NightInternational Gemini Observatory/NOIRLab/NSF/AURA/P. Horálek (Institute of Physics in Opav...