Superconducting sensors are a cornerstone of modern frontier physics, driving discoveries from the early universe to the quantum world. In this talk, I will discuss the diverse applications and synergistic development of superconducting detector technologies, highlighting how advances in one discipline frequently drive progress in others. The extensive R&D and industry partnerships established for CMB-S4 detector fabrication have opened new pathways for fabricating superconducting sensors, which are now enabling highly sensitive detector arrays for line intensity mapping, dark matter detection and quantum computing. This talk will illustrate the feedback loop between astrophysics, particle physics, and quantum science, showing how detectors built to observe the sky simultaneously advance quantum technology.