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abstraction > hypothesis > theory > astronomy theory > planetary theory

planetary theory
subject			fact

planetary theory	has domain planet
	is a kind of astronomy theory
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 planetary theory :

• accumulation theory (2 facts) - The theory by which planetesimals are assumed to collide with one another and coalesce, eventually sweeping up enough material to form the planets.