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physical object > natural object > celestial body > planet > proto-planet

proto-planet
subject			fact

proto-planet	has definition Early stage in the formation of planets according to the theory by which planetary systems evolve through the condensation of gas clouds surrounding a young star. The theory is not, however, generally accepted.
	is a kind of planet
planet	has composition various elements
	is a part of solar system
	has orbit
	has mass greater than Pluto's mass and less massive than ten times Jupiter's mass
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material