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physical object > natural object > celestial body > collection of stars > collection of galaxies > binary galaxy

binary galaxy (double galaxy)
subject			fact

binary galaxy	has number of galaxies 2
	has synonym double galaxy
	has definition Two galaxies orbiting each other owing to their mutual gravitational attraction.
	is a kind of collection of galaxies
collection of stars	has number of stars
	has catalog catalog about star systems
celestial body	has spectra
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

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