Fritz Zwicky looked at the Coma galaxy cluster in 1933, applied the virial theorem, and concluded that most of the universe must be invisible. He also called his colleagues spherical bastards, meaning difficult from every angle. This deep dive traces the contradictory life of the Swiss astronomer who was born in Bulgaria in 1898, shipped to Switzerland at age six to study commerce, and instead earned a doctorate in ionic crystal physics before arriving at Caltech in 1925.

The episode follows his run of ideas that outpaced the tools of his era: dark matter, the term supernova coined with Walter Baade in 1934, neutron stars predicted five years before Oppenheimer, gravitational lensing proposed in 1937 and not observed until 1979, and 120 supernovae discovered by eye from photographic plates. It also covers his rocketry work, the artificial meteor experiment in October 1957, his morphological analysis method, and his postwar effort to ship tons of scientific literature to bombed-out libraries.

• How the virial theorem revealed that the Coma cluster should have flown apart without unseen mass
• Why the scientific community dismissed dark matter for decades, and how Zwicky’s personality made it worse
• Morphological analysis: the grid-based thinking system behind the underwater jet engine and stranger ideas
• The gun fired through an observatory slit, nuclear goblins, and a plan to steer the entire solar system
• Humanitarian work with war orphans, the Presidential Medal of Freedom, and the Royal Astronomical Society gold medal in 1972