SPACE.com compiled a list of the major observatories currently up doing space-based astronomy. The list excludes rovers, orbiters and planetary probes not doing traditional telescope observations. The list excludes rovers, orbiters and planetary probes not doing traditional telescope observations.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Founded in 1956, the NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community.
The W. M. Keck Observatory is a two-telescope astronomical observatory at an elevation of 4,145 meters (13,600 ft) near the summit of Mauna Kea in the U.S. state of Hawaii. Both telescopes feature 10 m (33 ft) primary mirrors, currently among the largest astronomical telescopes in use.