Following Mather et al. (1999) we describe a concept for a future space mis
sion called SPECS, a spatial and spectral Michelson interferometer with Hub
ble Telescope-class angular resolution and sensitivity that operates in the
far infrared and submillimeter spectral range. SPECS enables detailed stud
ies of the physical conditions in high-redshift galaxies and has the potent
ial to revolutionize our understanding of galaxy formation and evolution.