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planet comparison table

Subject	has material	has apparent magnitude	has been observ	has synonym	has definition	has motion relative to star	has composition
gas giant				Jovian planet	Giant planet that has a gaseous surface.		Mostly made of various light elements such as gases and simple compounds
naked eye planet		brighter than 5	for many centuries		a planet in our solar system visible to the unaided eye	epicycloidal	various elements
proto-planet					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.		various elements
superior planet					Planets farther from the Sun than the Earth is (i.e., Mars to Pluto).		various elements
terrestrial planet	silicates, oxides, water				A planet having a compact rocky surface like Earth		mostly made of heavier non-volatile elements

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