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physical object > artifact

artifact
subject			fact

artifact	is a kind of physical object
	has definition an object made by humans
	has creator
	has creation date
	has purpose
	has owner
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of artifact :

• device (298 kinds, 1542 facts) - an instrumentality invented for a particular purpose
• observatory (7 kinds, 31 facts) - a place on earth which has one or more telescopes