noctilucent Definition

bright, airglow, earthshine, zodiacal light, aurora borealis, polarimetry, aurorae, aeronomy, photometry, coronagraph, epsilon aurigae, retroreflector, occultation, grond, astronomical telescope, exosphere, eclipsing binary, spectrographic, sundog, planetary nebula, small magellanic cloud, haloes, spectrometric, blackbody, radial velocity, photoluminescence, attosecond, quasars, nebulae, photoelectron, phosphorescence, axion, novae, meteoroid, themis, periodicities, nightglow, saturnian, antineutrinos, nebulosity, jovian, photosphere, prograde, luminosities, syrtis major, omega centauri, cosmic ray, quasicrystal, cosmic microwave background, photometer, dixi, exobiology, cherenkov radiation, prominences, backscattering, mimas, moonlet, infrared, spectroscope, astrometry, ionosphere, gamma ray, lunar crater, supernovae, minos, maser, gravitational interaction, photolysis, flyby, plasmon, obscuration, infrared radiation, ecliptic, gradiometer, osiris, dipole moment, martian, corona australis, electroluminescence, corot, arcsecond, sunspot, kev, comet, galactic plane, astronomers, taurid, gamma rays, monochromator, asterism, cepheid variable, photoemission, andromeda galaxy, sidereal, muon, celestial sphere, baryon, oort cloud, spectroscopic analysis, perseids,