The Multi Unit Spectroscopic Explorer (MUSE) is a second generation instrument installed at the Very Large Telescope (VLT) of the European Southern Observatory (ESO).
It is an integral-field spectrograph operating in the visible wavelength range. It combines a wide field of view with a fine spatial sampling and a large simultaneous spectral range. It is designed to take advantage of the improved spatial resolution provided by adaptive optics. MUSE had first light on the VLT on 31/01/2014.