For centuries, astronomers held a perfectly reasonable belief that other stars must harbor their own planets. The logic was sound, rooted in the idea that our solar system is not special. Yet, for the longest time, this belief remained hollow because there was no way to observe a distant world drowned in the glare of its parent star. This episode explores the ingenious methods astronomers developed to finally turn that philosophical assumption into measurable scientific fact.

We trace the history of exoplanet detection from the early failures of astrometry to the triumph of radial velocity, which measures a star's microscopic wobble via the Doppler effect. The discovery of 51 Pegasi b in 1995 shattered the expectation that other systems would look like ours, revealing massive gas giants orbiting improbably close to their suns. From there, w ...