Black Holes, Tides, and Curved Spacetime: Understanding Gravity Season 1 Episode 21 Which Universe Is Ours?

Investigate what Einstein called his "greatest mistake"--his rejection of his own theory's prediction that spacetime should be dynamic and evolving. Chart the work of a group of scientists, including Alexander Friedman, Georges Lemaître, and Edwin Hubble, who advanced the realization that our universe is expanding from an apparent big bang.