The Wow! Signal Was 4x Stronger Than We Thought #space #wow #science #discovery

In 1977 a radio telescope in Ohio caught the Wow! signal: 72 seconds, at the hydrogen line, from Sagittarius, and it never came back. New analysis of the original Big Ear data shows it was about 4 times stronger than we thought, and there is now a natural suspect. In this case file we decode the famous 6EQUJ5 printout, check every suspect (Earth, satellites, a comet, an alien beacon, a Sun-like star) against the evidence, and follow the Arecibo Wow! project from its 2020 drift scans to the 2025 re-measurement. The new idea: a magnetar flare that turned a small, cold hydrogen cloud into a natural maser. It has never been observed, and it makes predictions that can be tested. Stay to the end for a first look at our next case: why aliens haven't contacted us. Chapters 0:00 Has the Wow! signal been solved? 0:46 August 15, 1977: Big Ear 4:05 Decoding 6EQUJ5 5:35 Why the hydrogen line matters 8:02 The two-horn puzzle 9:26 It never came back 12:11 A Sun-like star and Breakthrough Listen 13:08 The suspects: Earth and satellites 15:34 Suspect 3: a comet 16:59 Suspects 4 and 5: a beacon or a star 18:45 Arecibo Wow!: cold hydrogen clouds 21:23 40,000 events nobody checked 22:29 The signal was 4x stronger 23:40 A natural maser 25:25 The trigger: a magnetar 26:19 The 2020 clue: SGR 1935+2154 28:56 The verdict 32:05 Next case: why haven't aliens called? Main sources Ehman, J. R. (2010), The Big Ear Wow! Signal, 30th anniversary report: https://www.bigear.org/Wow30th/wow30t... Méndez, Ortiz Ceballos & Zuluaga (2024), Arecibo Wow! I: An Astrophysical Explanation for the Wow! Signal (preprint): https://arxiv.org/abs/2408.08513 Méndez et al. (2025), Arecibo Wow! II: Revised Properties of the Wow! Signal from Archival Ohio SETI Data (preprint): https://arxiv.org/abs/2508.10657 Méndez, Dixon & Childers (2026), The Ohio SETI Program: The Last Decades: https://arxiv.org/abs/2606.11102 Planetary Habitability Laboratory, Wow! summary: https://phl.upr.edu/wow/summary Gray & Marvel (2001), A VLA Search for the Ohio State "Wow", ApJ 546, 1171 Gray & Ellingsen (2002), A Search for Periodic Emissions at the Wow Locale, ApJ 578, 967 Cordes, Lazio & Sagan (1997), Scintillation-induced Intermittency in SETI, ApJ 487, 782 Cocconi & Morrison (1959), Searching for Interstellar Communications, Nature 184, 844 Paris & Davies (2017), J. Washington Acad. Sci., and the reply by the Ohio State Radio Observatory (bigear.org) Caballero (2022), Int. J. Astrobiology 21, 1 · Perez et al. (2022), RNAAS, Breakthrough Listen (GBT + ATA): https://seti.berkeley.edu/wow/ SGR 1806-20 giant flare (2004): NASA Images: NASA; NASA/JPL-Caltech; ESA/Webb, NASA, CSA (CC BY 4.0); NASA, ESA, CSA, STScI, JADES; NRAO/AUI/NSF (CC BY 4.0); SKAO (CC BY 3.0); brewbooks (CC BY-SA 2.0); Z22 (CC BY-SA 4.0); SkywalkerPL (CC BY 3.0); Emilio Segrè Visual Archives, AIP (CC BY 4.0); Wikimedia Commons contributors. Full credits are shown on screen. The 1977 printout, diagrams, animations and music were made for this channel.