Midcourse Space Experiment
Operational from 1996 to 1997, MSX mapped the galactic plane and areas either missed or identified as especially bright by the Infrared Astronomical Satellite (IRAS) at wavelengths of 4.29 μm, 4.35 μm, 8.28 μm, 12.13 μm, 14.65 μm, and 21.3 μm.