[Interview] Black Holes Spin. Now, How Can We Measure That?

Black holes are defined by only three parameters: mass, charge and spin. We know that black holes spin. But how can we measure that? What tools and methods are at our disposal? Answering these questions with Dr Ruth Daly, Professor of Physics at Penn State University.📃 New Black Hole Spin Values for Sagittarius A* Obtained with the Outflow Methodhttps://arxiv.org/abs/2310.12108🦄 Support us on Patreon: https://patreon.com/universetoday📚 Suggest books in the book club:https://www.goodreads.com/group/show/1198440-universe-today-book-club00:00 Intro01:11 Black Holes' mass06:22 Jets from Quasars09:00 Being near a black hole10:35 Measuring the Sgr A18:56 Spinning black holes26:41 Orientation of Sag A29:02 Energy of black holes32:33 Final thoughts📺 VIDEO VERSIONhttps://youtu.be/9ArfZdNDtzY📰 EMAIL NEWSLETTERRead by 60,000 people every Friday. Written by Fraser. No ads.Subscribe. It's FREE: https://universetoday.com/newsletter🎧 PODCASTSUniverse Today: https://universetoday.fireside.fm/Astronomy Cast: http://www.astronomycast.com/🤳 OTHER SOCIAL MEDIATwitter: https://twitter.com/fcainTwitter: https://twitter.com/universetodayFacebook: https://facebook.com/universetodayInstagram: https://instagram.com/universetoday📩 CONTACT [email protected]⚖️ LICENSECreative Commons Attribution 4.0 International (CC BY 4.0)Support Universe Today Podcast