In December 2007, Moore and his wife donated $200 million to Caltech and the University of California for the construction of the Thirty Meter Telescope (TMT), expected to become the world's second largest optical telescope once it and the European Extremely Large Telescope are completed in the mid-2020s. The TMT will have a segmented mirror 30 meters across and be built on Mauna Kea in Hawaii. This mirror will be nearly three times the size of the current record holder, the Large Binocular Telescope. The Moores, as individuals and through their foundation, have also, through a series of gifts and grants, given over $110 million to the University of California, Berkeley.