Checkout Terry Tao's 'Distance Ladder' slides and video: https://terrytao.files.wordpress.com/2017/11/cosmic-distance-ladder2.pdf https://terrytao.files.wordpr

Checkout Terry Tao's 'Distance Ladder' slides and video: https://terrytao.files.wordpress.com/2017/11/cosmic-distance-ladder2.pdf https://terrytao.files.wordpress.com/2017/11/cosmic-distance... https://www.youtube.com/playlist?list=PLldN_DpkXL3ZQWmwmwIzeITvK3a8Yd1Sz https://www.youtube.com/playlist?list=PLldN_DpkXL3ZQWmwmwIze...