horsehead nebula Definition

trifid, syrtis major, zodiacal light, omega centauri, epsilon aurigae, sundog, fossae, tarantula nebula, eclipsing binary, asterism, micrograph, camelopardalis, nebula, puppis, airglow, coma berenices, gibbous, eridanus, canis major, planitia, planetary nebula, cumulus cloud, celestial sphere, canes venatici, nebulosity, lunette, monoceros, andromeda galaxy, cepheus, retroreflector, serpens, starlike, corona borealis, ellipsoidal, vulpecula, proxima centauri, mirrorlike, spiral galaxy, crab nebula, earthshine, cloudscape, ursa minor, circumstellar, epimetheus, triangulum, ellipse, galactic plane, lyrae, moonlike, prominences, hydrus, milky way galaxy, small magellanic cloud, armillary sphere, capricornus, tycho brahe, metamorphic rock, quincunx, hipparchus, jovian, filamentary, spheroidal, photosphere, circinus, isosceles triangle, borealis, massifs, zoomorphic, canis minor, stippled, chambered nautilus, corona australis, pleiades, extragalactic, coronagraph, arcsecond, asteroidal, hummocks, hubble, large magellanic cloud, astronomical telescope, spectrometric, fornax, lapilli, caryatids, moonlet, mimas, earthlike, equilateral triangle, collinear, newtonian telescope, planetoids, prograde, rock outcrop, fomalhaut, opalescence, tessellated, azimuthal, tetrahedron, hyades,