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The BIG news in physics is that a new type of gravitational wave has been detected using pulsar timing arrays. In this video we’re chatting about what a pulsar timing array actually is, what’s been found, and why the gravitational waves *might* be from pairs of supermassive black holes orbiting each other, but there’s evidence that they could be from new physics processes occurring in the early Universe… NanoGrav research papers - https://nanograv.org/news/15yrRelease EPTA & InPTA research papers - https://www.epta.eu.org/epta-dr2.html Parkes PTA research papers - https://www.atnf.csiro.au/research/pulsar/ppta/#section0 Chinese PTA research papers - https://iopscience.iop.org/article/10.1088/1674-4527/acdfa5 00:00 - Introduction 01:48 - What is a pulsar timing array? 04:47 - How are these gravitational waves different to the ones detected by LIGO? 06:33 - What are the pulsar timing arrays looking for? 09:37 - What does the data look like? 13:11 - Are these gravitational waves from pairs of supermassive black holes? 16:02 - OR Is there evidence for NEW PHYSICS? 21:34 - What's next then? 23:29 - Bloopers Video filmed on a Sony \u237a7 IV --- \ud83d\udcda My new book, "A Brief History of Black Holes", out NOW in hardback, e-book and audiobook (which I narrated myself!): http://hyperurl.co/DrBecky --- \ud83d\udcda "The Year In Space" celebrating all things space in 2022 from me and the rest of the Supermassive Podcast team: https://geni.us/jNcrw --- \ud83d\udc55 My new merch, including JWST designs, are available here (with worldwide shipping!): https://dr-becky.teemill.com/ --- \ud83c\udfa7 Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive --- \ud83d\udd14 Don't forget to subscribe and click the little bell icon to be notified when I post a new video! --- \ud83d\udc69\ud83c\udffd‍\ud83d\udcbb 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