Since humanity first turned instruments toward the sky, each new wavelength of light has revealed a universe more intricate than the last. NASA's selection of the PRIMA far-infrared telescope for Phase B development continues that tradition, advancing a $1.2 billion observatory toward a 2033 launch that promises to illuminate the dark spaces between what we already see — the formation of distant worlds, the growth of galaxies, the slow accumulation of the elements that make life possible. Born from the recommendations of the scientific community's own decadal reckoning, PRIMA represents not me