airglow, jovian, prograde, coronagraph, spectrographic, toroid, photometer, polarimetry, spectroscope, toroidal, azimuthal, scintillator, gimbals, cherenkov radiation, parabolic reflector, arcsecond, gradiometer, spectrometric, photoconductive, parabolic mirror, photomultipliers, astrometry, collimating, geosynchronous, interferometer, spectroscopic analysis, monochromator, ferric oxide, convex lens, resonant cavity, astronomical telescope, bolometer, exosphere, syrtis major, sundog, radiometry, diffracting, grond, synchronous orbit, armillary sphere, frustum, newtonian telescope, magnetic dipole, phyllosilicate, cryostat, diffraction grating, lunar excursion module, reflector, epsilon aurigae, dipole moment, antineutrino, spacecraft, eclipsing binary, horsehead nebula, radome, photosphere, prominences, zodiacal light, multispectral, hexapod, baseplate, smos, photodetector, gnomon, quasicrystal, josephson junction, galvanometer, corona discharge, photometry, icosahedral, bimetal, hypervelocity, photoelectron, iris diaphragm, geoid, klystron, nebular, moonlet, gravitational interaction, celestial sphere, ellipsoids, tetrahedron, magnetisation, geostationary, tarantula nebula, micrometre, quasiparticle, blackbody, plasmon, eyepiece, particle beam, magnifications, odometry, stereographic, polyhedron, paramagnetic, drogue parachute, refractor, pyrometer, photometric, telescope, magnetic monopole