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Curated by: Dr. Becky (15 videos)
Visit https://brilliant.org/DrBecky/ to get started learning STEM for free, and the first 200 people will get 20% off their annual premium subscription. Doctor Who Season 2 Episode 8 The Impossible Planet sees the Doctor and Rose stranded on a planet in orbit around a black hole. The Doctor claims this is “impossible” - but is it? Which bits of this episode are based in science and which are most definitely fiction? Filmed for all you Whovians out there. Watch all the previous seasons of Doctor Who on BBC iPlayer: https://www.bbc.co.uk/iplayer/episode/b0074gfz/doctor-who-series-2-8-the-impossible-planet Check out my other “astrophysicist reacts” videos: https://youtube.com/playlist?list=PLd19WvC9yqUcMvNzQh_avFaOkeIwX20Sf Padovani et al. (2017; review paper on AGN showing light emitted by accretion disk across wavelength spectrum) - https://arxiv.org/pdf/1707.07134.pdf Bondi (1957; negative mass in general relativity - behind paywall unfortunately) - https://journals.aps.org/rmp/abstract/10.1103/RevModPhys.29.423 King (2016; how big can black holes grow, equation for self-gravitational radius) - https://arxiv.org/pdf/1511.08502.pdf 00:00 - Introduction 01:01 - How good is the black hole visualisation? 02:09 - You CAN be in orbit around a black hole 03:26 - A *geostationary* orbit around a black hole? 05:24 - The Innermost Stable Circular Orbit around a black hole (it’s not “impossible” Doctor) 06:49 - The inevitable radiation burns from a growing, glowing black hole 08:20 - “Gravity funnels”, artificial gravity and negative mass 11:48 - Spaghettification and the self-gravitational radius 13:43 - “the blazen scale” lol 13:59 - Tidal Disruption Events and spaghettification 14:47 - WORMHOLES AND BLACK HOLES ARE TWO DIFFERENT THINGS ROSE 15:58 - Outro 17:28 - Brilliant 18:32 - Bloopers --- 📚 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 --- 📚 "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