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We present Hyperion, a mission concept recently proposed to the December 2021NASA Medium Explorer announcement of opportunity. Hyperion explores theformation and destruction of molecular clouds and planet-forming disks innearby star-forming regions of the Milky Way. It does this using long-slit,high-resolution spectroscopy of emission from fluorescing molecular hydrogen,which is a powerful far-ultraviolet (FUV) diagnostic. Molecular hydrogen (H2)is the most abundant molecule in the universe and a key ingredient for star andplanet formation, but is typically not observed directly because its symmetricatomic structure and lack of a dipole moment mean there are no spectral linesat visible wavelengths and few in the infrared. Hyperion uses molecularhydrogen's wealth of FUV emission lines to achieve three science objectives:(1) determining how star formation is related to molecular hydrogen formationand destruction at the boundaries of molecular clouds; (2) determining howquickly and by what process massive star feedback disperses molecular clouds;and (3) determining the mechanism driving the evolution of planet-forming disksaround young solar-analog stars. Hyperion conducts this science using astraightforward, highly-efficient, single-channel instrument design. Hyperion'sinstrument consists of a 48 cm primary mirror, with an f/5 focal ratio. Thespectrometer has two modes, both covering 138.5-161.5 nm bandpasses. A lowresolution mode has a spectral resolution of R>10,000 with a slit length of 65arcmin, while the high resolution mode has a spectral resolution of R>50,000over a slit length of 5 armin. Hyperion occupies a 2 week long, high-earth,Lunar resonance TESS-like orbit, and conducts 2 weeks of planned observationsper orbit, with time for downlinks and calibrations. Hyperion was reviewed asCategory I, which is the highest rating possible, but was not selected.

Hyperion: The origin of the stars A far-UV space telescope for high-resolution spectroscopy over wide fields