Synonyms and related words :
Cassegrainian telescope, Newtonian telescope, OAO, OSO, astronomical observatory, astronomical telescope, chromatoscope, coelostat, coronagraph, coronograph, heliostat, kaleidoscope, observatory, orrery, oscilloscope, periscope, planetarium, radar telescope, radio observatory, radio telescope, reflector, refractor, spectrograph, spectroheliograph, spectrohelioscope, stereoscope, telescope