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FINESSE (for Fast Infrared Exoplanet Spectroscopy Survey Explorer) was a planned space observatory to perform infrared spectrographic observations of 500 extra-solar planets. It was a NASA MIDEX (Medium-class Explorer Program) candidate proposal for a 2019 decision. A 2023 launch date was targeted to be followed by a mission of at least two years. It would reside at the Earth-Sun L2 Lagrangian point. In February 2019, NASA selected a competing proposal, SPHEREx. The FINESSE plan was considered redundant, given the ESA ARIEL plan.
NASA also uses the acronym FINESSE for an initiative called Field Investigations to Enable Solar System Science and Exploration, a research effort in support of future exploration of the Moon, near-Earth objects, and the Mars moons, Phobos and Deimos.