This dimension sorts celestial objects by their basic kind, such as a planet, star, galaxy or comet. Wikipedia notes that "asteroids, moons, planets, and stars are astronomical bodies," while looser structures such as "planetary systems, star clusters, nebulae, and galaxies" count as objects in the wider sense. Browsing by object type keeps similar kinds of objects grouped together.
Facts
Comparison
Field Origin Era Object Type
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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