General relativity (Physics)

In 1915, Albert Einstein presented his masterwork to the Prussian Academy of Sciences - a theory of gravity, matter, space and time: the General Theory of Relativity. Einstein himself said it was 'the most valuable theory of my life', and 'of incomparable beauty'. It describes the evolution of th...

Let us journey, with beloved physicist Carlo Rovelli, into the heart of a black hole. Let us slip beyond its boundary, the horizon, and tumble - on and on - down this crack in the universe. As we plunge, we'll see geometry fold, we'll feel the equations draw tight around us. Eventually, we'll pas...