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 Messier Catalogue
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Sources
1. Wikipedia: Nebula
Wikimedia FoundationNebula, Observational history section, Messier catalogue sentenceQuote, Nebula, Observational history section, Messier catalogue sentence
Charles Messier then compiled a catalog of 103 nebulae (now called Messier objects, which included what are now known to be galaxies) by 1781
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