Joint AAO/ATNF Colloquium. Wednesday, 21st February - 3:30pm ATNF Lecture Theatre Transition Edge Sensors for the IR through UV: A New Tool for Astrophysics Roger W. Romani (ATNF & Univ. of Sydney) Stanford University Many astrophysical observations will remain photon-starved even in the era of 8-m class telescopes. Advanced cryogenic detector technology can provide important new capabilities for the pursuit of faint object astrophysics. The detectors being developed by our Stanford/NIST TES program, for example, provide time- and energy-resolved photon counting at high QE across a wide wavelength range. I summarise the operation of the TES sensor, describe our initial instrumentation for ground-based IR/optical and show early results from observations of pulsars and other compact objects. The future potential of these devices is illustrated by sketching the capabilities of a next generation spaced-based array for astrophysics and cosmology.