How do we know the age of the Universe? Featuring Dr Becky Smethurst and Professor Ed Copeland. Deep Sky Videos: https://youtube.com/deepskyvideos More links and info below ↓ ↓ ↓ Dr Smethurst is the "Sixty Symbols Ogden Fellow", supported by The Ogden Trust. More Becky videos: http://bit.ly/Becky_Playlist More Ed Copeland: http://bit.ly/CopelandGoesLong MORE READING: A gravitational-wave standard siren measurement of the Hubble constant - https://arxiv.org/abs/1710.05835 Planck 2015 results. XIII. Cosmological parameters - https://arxiv.org/abs/1502.01589 Visit our website at http://www.sixtysymbols.com/ We're on Facebook at http://www.facebook.com/sixtysymbols And Twitter at http://twitter.com/sixtysymbols This project features scientists from The University of Nottingham http://bit.ly/NottsPhysics Patreon: https://www.patreon.com/sixtysymbols Sixty Symbols videos by Brady Haran http://www.bradyharanblog.com Music courtesy of Alan Stewart: http://bit.ly/AlanAlbum Email list: http://eepurl.com/YdjL9