Stand at the edge of Verona Rupes and look down roughly 20 kilometers into darkness, then step off and fall in slow motion for minutes because the gravity is so weak. That cliff is real, and it sits on Miranda, the smallest and innermost of Uranus’s five major moons. This deep dive treats the moon as a biography, from a quiet birth through a violent middle age to the frozen, scarred state it is in now.

The episode covers Gerard Kuiper’s 1948 discovery from Texas, the tilted 4.34-degree orbit that hinted at trauma, and the Voyager 2 flyby of January 1986 that photographed only the southern hemisphere and revealed incompatible terrains stitched together: cratered regiones, grooved coronae named Inverness, Arden and Elsinore, and enormous fault scarps. It explains why the shattered-and-reassembled theory fell apart, how a 3:1 orbital resonance with Umbriel drove tidal heating, how rising diapirs flipped the moon by 90 degrees, and what a 2024 study says about a subsurface ocean up to 100 kilometers thick.

• A 470-kilometer dirty snowball, about 60 percent water ice, with a surface area roughly the size of Texas
• Tidal heating explained with a bent paper clip, and the clathrate blanket that trapped the warmth
• Why the trailing hemisphere carries the densest craters, the smoking gun for a 90-degree flip
• How refreezing expanded the moon by about 4 percent and tore open Verona Rupes
• The unmapped northern hemisphere and the proposed flagship mission back to Uranus