Are we alone in the Universe? Although there's no evidence for life elsewhere in the Solar System or beyond (yet!), science can at least help us work out if alien life is likely or not. To learn something new, head to https://brilliant.org/drbecky and sign up for free! More on the Hubble Ultra Deep Field (HUDF) image: https://svs.gsfc.nasa.gov/30946 00:00 - Introduction 00:35 - How many galaxies are in the Universe? 03:19 - How many stars are in the Universe? 04:45 - How many of those have planets? 07:14 - How many of those are habitable? 09:11 - Will we ever communicate with alien life? 13:04 - BLOOPERS --- 🎧 Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive --- 👕 Check out my merch here: https://teespring.com/stores/dr-becky --- 📚 "Space: 10 Things You Should Know" - UK Edition (available in the rest of the world except North America): http://bit.ly/SpaceDrBecky 📚 US & Canada version: "Space at the speed of light" (same book, different title, with some beautiful illustrations): https://www.penguinrandomhouse.com/books/635406/space-at-the-speed-of-light-by-dr-becky-smethurst/ 📚 German translation "Das kleine Buch vom großen Knall" : https://www.dtv.de/buch/becky-smethurst-das-kleine-buch-vom-grossen-knall-28254/ --- 🔔 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/