Nothing with mass can travel faster than light—but surprisingly, a shadow can. In this episode, we explore one of the strangest concepts in physics: how the edge of a shadow can appear to move across a distant surface at speeds greater than light itself without breaking any laws of nature.

We dive into optics, geometry, relativity, light propagation, perception, and the difference between information and apparent motion. We explore how a small movement close to a light source can create enormous movements across distant objects, why no energy or information is actually traveling faster than light, and how similar effects appear in astronomy when beams of light sweep across vast distances in space.

This episode examines the fascinating boundary between what appears possible and what physics actually allows. If you enjoy physics, astron ...