Rubuta ci gaba don wannan sakin layi - An gano yanayin yanayin tauraron dan adam kamar yadda ya bambanta da sauran nebulae (girgije na interstellar) a cikin 1920s
Ka yi haƙuri. An yi ƙoƙari na farko a cikin kundin tsarin galaxies a cikin shekarun 1960, tare da Catalogue of Galaxies and Clusters of Galaxies da ke lissafin 29,418 galaxies da galaxy clusters, da kuma tare da Morphological Catalogue of Galaxies, jerin jerin jerin jerin galaxies tare da girman hoto sama da 15, da ke lissafin 30,642. A cikin 1980s, Lyons Groups of Galaxies sun lissafa ƙungiyoyin galaxy 485 tare da membobin galaxies 3,933. Galaxy Zoo wani shiri ne da ke nufin jerin abubuwan da suka fi dacewa: an kaddamar da shi a watan Yuli 2007, ya rarraba fiye da miliyoyin hotuna na galaxy daga The Sloan Digital Sky Survey, The Hubble Space Telescope da Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey.