spiral galaxy Definition

spiral nebula, planetary nebula, andromeda galaxy, nebula, milky way galaxy, large magellanic cloud, small magellanic cloud, quasar, neutron star, supernova, proxima centauri, gravitational interaction, oort cloud, pulsar, zodiacal light, redshift, cepheid variable, celestial sphere, betelgeuse, extragalactic, nebulosity, gravitationally, triangulum, galactic, comet, exoplanet, ngc, coma berenices, asteroid belt, alpha centauri, planetoid, planetesimal, canis major, galaxies, omega centauri, protostar, asterism, eclipsing binary, orbits, epsilon aurigae, tarantula nebula, monoceros, puppis, moonlet, planets, trifid, fomalhaut, ejecta, torus, astronomers, iapetus, corona, horsehead nebula, mimas, luminosities, arcsecond, photosphere, coronagraph, cassiopeia, gamma rays, circumstellar, pleiades, prograde, fainter, celestial equator, nuclei, asteroidal, chromosphere, baryon, novae, heliosphere, constellation, exosphere, jovian, ellipse, enceladus, canes venatici, antiparticle, auroral, eridanus, atoms, filaments, perigee, camelopardalis, starburst, aurigae, serpens, cepheus, sundog, cosmic microwave background, quasicrystal, ecliptic, syrtis major, magnetosphere, interstellar medium, cosmic rays, sunspot, gibbous, scorpius, phaethon,