Multiple-Mirror Telescope, by Williams, J. T, c. 1977, Smithsonian Archives - History Div, The exterior, sporting a new outer skin of metal siding, of the facility housing the Multiple-Mirror Telescope (MMT) at Mount Hopkins Observatory, now known as the Fred Lawrence Whipple Observatory, in southern Arizona. The MMT is a joint project between the Smithsonian Astrophysical Observatory and the University of Arizona..