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physical object > natural object

natural object
subject			fact

natural object	has definition an object occurring naturally, not constructed by humans
	is a kind of physical object
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 natural object :

• celestial body (727 kinds, 4312 facts) - natural object visible in the sky
• collection of particles (58 kinds, 391 facts)
• particle (548 kinds, 5867 facts) - Fundamental unit of matter and energy. All may be classed as fermions, which have half-integral spin and obey the exclusion principle, and bosons, which have integral spin and do not obey the exclusion principle. The term particle is metaphoric, in that all subatomic particles also evince aspects of wave-like behavior.
• theoretical celestial body (14 kinds, 47 facts) - natural object postulated by theory but not yet observed