aurora borealis Definition

northern lights, meteor shower, aurora australis, zodiacal light, meteor, lunar eclipse, solar eclipse, corona borealis, annular eclipse, comet, celestial equator, celestial sphere, corona australis, planetary nebula, celestial, coma berenices, occultation, summer solstice, andromeda galaxy, starlight, aurora, ursa minor, ecliptic, epsilon aurigae, perseids, earthshine, noctilucent, constellations, nebulae, sundog, sunrises, moonrise, cosmic ray, gyrfalcon, hawk owl, polar, asterism, iridescence, telescope, nightglow, stargazing, astronomy, partial eclipse, stargazers, spitzbergen, astronomers, phosphorescence, geomagnetic, cosmic rays, baltimore oriole, fireflies, ionosphere, meteoroid, alpenglow, snowy owl, borealis, polarimetry, quasars, blackburnian warbler, hummingbird moth, supernova, observatory, hoarfrost, omega centauri, solstice, photosphere, gamma rays, woodcocks, sunspots, airglow, pleiades, syrtis major, planetarium, geysers, synaesthesia, glowworms, cosmic microwave background, harlequin duck, occulted, ptarmigan, themis, arctic, starburst, equinox, galactic plane, neutrinos, horsehead nebula, luminous, dragonflies, xenon, oriole, thunderclouds, sunsets, eclipsing binary, foehn, iapetus, bolide, astrophysical, nebulosity, superfluidity,