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Future far-infrared astronomy missions will need large arrays of detectorswith exceptionally low noise-equivalent power (NEP), with some mission conceptscalling for thousands of detectors with NEPs below a few $\times 10^{-20}$W/$\sqrt{\mathrm{Hz}}$. Though much progress has been made toward meeting thisgoal, such detector systems do not exist today. In this work, we present adevice that offers a compelling path forward: the longitudinal proximity effect(LoPE) transition-edge sensor (TES). With a chemically-stable andmechanically-robust architecture, the LoPE TES we designed, fabricated, andcharacterized also exhibits unprecedented sensitivity, with a measuredelectrical NEP of $8 \times 10^{-22}$ W/$\sqrt{\mathrm{Hz}}$. This represents a>100x advancement of the state-of-the-art, pushing TES detectors into theregime where they may be employed the achieve to goals of even the mostambitious large and cold future space instruments.

Demonstration of ultra-low noise equivalent power using a longitudinal proximity effect transition-edge sensor