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: Black hole
Wikimedia FoundationBlack hole, lead sectionQuote, Black hole, lead section
In 1916, the first solution of general relativity that would characterise a black hole was found.
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