This dimension names the astronomical catalogue in which a celestial object is formally listed. Wikipedia defines such a catalogue as "a list or tabulation of astronomical objects, typically grouped together because they share a common type, morphology, origin, means of detection, or method of discovery." Browsing this way collects every object recorded in the same catalogue.
Facts
Comparison
Field Origin Era Catalogue
Sources
1. Wikipedia: Galaxy
Wikimedia FoundationGalaxy, Observation history section, 1926 Hubble classification sentenceQuote, Galaxy, Observation history section, 1926 Hubble classification sentence
In 1926 Hubble produced a classification of galactic morphology that is used to this day.
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