We have spent centuries learning to read shadows, but it is only recently that we have learned to read the ones that dim stars a thousand light-years away. When a planet crosses the face of its host star, it creates a whisper of darkness, a drop in brightness smaller than a candle's flutter seen from a mile off. By measuring these almost imperceptible light curves, astronomers have transformed a simple geometric alignment into one of the most productive methods in the history of science.

This episode explores the transit method, tracing its conceptual origins to Edmund Halley and following it through the modern era of space-based observatories. We examine how missions like CoRoT, Kepler, and TESS stare at the sky to capture these minute variations in light, and how the James Webb Space Telescope uses transmission spectroscopy to read the ch ...