Real science, from a real scientist. I'm an astrophysicist at the University of Oxford making videos explaining the Universe. 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. I have also written two books: "A Brief History of Black Holes" "Space: 10 Things You Should Know" "Space at the Speed of Light" is the US title of Space: 10 Things You Should Know