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The Wide-field Multi-object Spectrograph (WFMOS) was a proposed instrument for research in cosmology. Its aim was to identify many distant galaxies with information about their positions, under the assumption that this would show a tendency for galaxies to be found 150 parsecs distant from each other, a signature of baryon acoustic oscillations. The WFMOS was intended for one of the Gemini Observatory telescopes and later the Subaru Telescope. A more-recently planned instrument (the Subaru PFS spectrograph) has taken its niche.