<prompt> Bhala okuqhubekayo kwalesi sigaba - Ukutholwa kwemvelo yemithala njengokuhlukile kwezinye i-nebulae amafu e-interstellar kwenziwa ngawo-1920  <response>: . futhi. Imizamo yokuqala yokwenza izinhlu ezihleliwe zemithala yenziwa ngawo-1960, lapho i-Catalogue of Galaxies and Clusters of Galaxies ibala imithala engu-29,418, kanye ne-Morphological Catalogue of Galaxies, uhlu oluphelele lwezinkanyezi ezinobukhulu bezithombe ezingaphezu kuka-15, ezibala u-30,642. Ngawo-1980, iQembu Lezinkanyezi LaseLyons labala amaqembu ezinkanyezi angu-485 anamalungu ezinkanyezi angu-3 933. I-Galaxy Zoo iphrojekthi ehlose ukuthola uhlu oluphelele: yethulwa ngoJulayi 2007, ihlukanise izithombe ezingaphezu kwesigidi zezinkanyezi ezivela ku-The Sloan Digital Sky Survey, i-Hubble Space Telescope kanye ne-Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey. 