MMI Corporation was founded in 1973 for the purpose of supplying teaching materials and equipment for astronomy to educators at secondary and College/University levels. Products includes portable and permanent planetariums in dome sizes ranging from 10 ft. diameter ( 3meters ) up to domes in the 40 ft. ( 12 meters ) and 50 ft ( 15 meter ) range and including suspended, inflatable and permanent type planetarium domes. We also offer many products such as our Polaris observatory domes, 35mm color slides, videocassettes, laserdiscs, CD-Roms, Sun-Moon-Planet models, celestial, terrestrial and planetary globes, satellite models, and a variety of other items, many not found elsewhere. MMI customers include College/University and secondary educators, planetariums, observatories, researchers and amateur astronomers.