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Go to https://sponsr.is/cs_drbecky and use code DRBECKY to save 25% off on subscription today. Thanks to Curiosity Stream for sponsoring today’s video. A new research study was published this month claiming to have completely ruled out an alternate theory of gravity called MOND, that doesn’t need dark matter to explain our observations of the Universe. They used the same data that four other research studies have used in the last couple of years, but used a more rigorous method, and their results now contradict the findings of those other papers. So what is going on here? Banik et al. (2023; Bayesian evidence ruling out MOND) - https://dx.doi.org/10.1093/mnras/stad... Chae (2023; evidence for AQUAL MOND from GAIA) - https://arxiv.org/pdf/2305.04613.pdf Hernandez (2023; evidence for MOND from GAIA data) - https://arxiv.org/pdf/2304.07322.pdf PIttordis & Sutherland (2023; evidence for general relativity from GAIA data) - https://arxiv.org/pdf/2205.02846.pdf Hernandez, Cookson & Cortés (2022; evidence for neither MOND nor general relativity from GAIA) - https://arxiv.org/pdf/2107.14797.pdf Banik & Zhao (2022; review of all the evidence for MOND) - https://arxiv.org/pdf/2110.06936.pdf Hernandez, Jiménez & Allen (2012; proposed test of MOND using GAIA data) - https://arxiv.org/pdf/1105.1873.pdf Milgrom (1983; first MOND paper) - https://articles.adsabs.harvard.edu/p... My previous video on the Chae paper: • MORE evidence AGAINST dark matter? | What ... My previous video on alternate theories of gravity: • Was Einstein "wrong"? | Testing new theori... My previous video on all the evidence we have for dark matter: • All the evidence we have for dark matter |... 00:00 - Introduction 01:39 - Curiosity Stream - AD 03:08 - What is MOND? 05:56 - What is the wide binary test? 08:31 - What have previous studies found? 09:34 - How have Banik et al. ruled out MOND? 14:00 - Why Banik et al. think the viral Chae results are unreliable 15:10 - Why this isn't evidence for dark matter 16:24 - Outro & thank you 17:13 - Bloopers Video filmed on a Sony ⍺7 IV --- 📚 My new book, "A Brief History of Black Holes", out NOW in hardback, e-book and audiobook (which I narrated myself!): http://lnk.to/DrBecky --- 📚 "The Year In Space" celebrating all things space in 2022 from me and the rest of the Supermassive Podcast team: https://geni.us/jNcrw --- 👕 My new merch, including JWST designs, are available here (with worldwide shipping!): https://dr-becky.teemill.com/ --- 🎧 Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive --- 🔔 Don't forget to subscribe and click the little bell icon to be notified when I post a new video! --- 👩🏽💻 I'm Dr. Becky Smethurst, an astrophysicist at the University of Oxford (Christ Church). I love making videos about science with an unnatural level of enthusiasm. I like to focus on how we know things, not just what we know. And especially, the things we still don't know. If you've ever wondered about something in space and couldn't find an answer online - you can ask me! My day job is to do research into how supermassive black holes can affect the galaxies that they live in. In particular, I look at whether the energy output from the disk of material orbiting around a growing supermassive black hole can stop a galaxy from forming stars. http://drbecky.uk.com https://rebeccasmethurst.co.uk