This dimension names the larger system that a celestial object belongs to, such as a particular planetary system or star cluster. Wikipedia notes that an astronomical object "admits a more complex, less cohesively bound structure, which may consist of multiple bodies or even other objects with substructures." Browsing this way moves from a single object up to the wider system that contains it.
Facts
Comparison
Field Origin Era Part Of
Sources
1. Wikipedia: Stellar classification
Wikimedia FoundationStellar classification, History section, 1901 Cannon sentenceQuote, Stellar classification, History section, 1901 Cannon sentence
In 1901, Annie Jump Cannon returned to the lettered types, but dropped all letters except O, B, A, F, G, K, M, and N used in that order, as well as P for planetary nebulae and Q for some peculiar spectra.
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