18th December 2025

The discovery of Saturn’s co-orbital moons Janus and Epimetheus revealed one of the strangest arrangements in the solar system. This episode explains how the two moons share the same orbit, periodically swapping places in a precise gravitational dance, how they were discovered decades apart, and why their motion puzzled astronomers for years. A clear look at the science behind Saturn’s “twin-track” moons and what they taught us about orbital mechanics.