The evolving role of Fourier transform spectroscopy in far-infrared space astronomy

Far-infrared spectroscopic observations of the universe provide a unique means of addressing some of the leading questions in modern astrophysics from the formation of stars and planets in our own galaxy to the evolution of galaxies over cosmic time. The technique of Fourier transform spectroscopy, with its ability to cover a broad spectral range at varying spectral resolution, has played a central role in such observations. The history of Fourier transform spectroscopy is reviewed and the evolving role of this technique in the era of photon counting infrared detectors discussed.