What if the universe ends not in a cold whimper but in a fiery collapse? This episode traces the Big Crunch hypothesis from Alexander Friedmann's 1922 equations through Einstein's static universe and his cosmological constant, the Bentley paradox that troubled Newton, and Edwin Hubble's redshift measurements that proved the cosmos is expanding. Einstein later called the static assumption his biggest mistake and visited Hubble in 1931 to thank him.

The hosts then walk through physicist Paul Davies' timeline of a hypothetical crunch, in which a shrinking universe blue-shifts the cosmic microwave background until empty space is hotter than stars and they boil away from the outside in. They explain why the 1998 discovery of accelerating expansion and dark energy seemed to rule out a crunch, and why a 2025 quintessence study by Andrei, Ijjas and ...