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abstraction > hypothesis > theory > astronomy theory

astronomy theory
subject			fact

astronomy theory	is a kind of theory
	has domain astronomy
theory	has validity correct or incorrect with caveats
	has author or reasearch group
	has date or a range of dates for which the theory was active

Kinds of astronomy theory :

• cosmology theory (18 kinds, 82 facts)
• galaxy theory (10 kinds, 25 facts)
• planetary theory (1 kind, 4 facts)
• stellar theory (3 kinds, 8 facts)