How big is the ENTIRE UNIVERSE?
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. Curtis-Lake et al. (2022; GS-z13 discovery in JWST data, no paywall) - https://arxiv.org/pdf/2212.04568.pdf My video explaining the discovery of GS-z13 - • JWST confirms MOST DISTANT galaxy! Plus nu... 00:00 - Introduction 00:48 - 28 billion light years (the Observable Universe) 02:29 - 93 billion light years - correcting for expansion 03:48 - An example with JWST galaxy GS-z13 05:25 - Comoving distance vs lookback distance 05:53 - We can't say the Universe is infinite 07:23 - Brilliant 08:46 - Bloopers Correction: 04:20 I wasn't very careful with my words or graphics here. For those familiar, I made the decision to skip over the idea of "proper distance" for simplicity in this video. This is the distance between us and the object (in this case GS-z13) when the light was emitted, which at the time was actually 2.34 billion light years. The Universe's expansion means that the light travel time is then the further "lookback distance" of 13.48 billion light years. --- 📚 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 (use code XMAS22 for 20% off): https://store.headline.co.uk/products... --- 👕 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
