The Very Long Baseline Array (VLBA) is a dedicated array of ten 25-m radio telescopes for very long baseline interferometry (VLBI) completed in 1993 and operated by the National Radio Astronomy Observatory. It shares headquarters with the Very Large Array, in Socorro, New Mexico. Eight of the VLBA instruments are strung out across the continental United States, while the other two are on Hawaii and the Virgin Islands, giving a maximum baseline of about 8,000 km and a resolution better than 0.001 arcsec at its shortest wavelength. See also Mauna Kea observatories.