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physical object > natural object > celestial body > collection of stars > collection of galaxies > galaxy cluster > galaxy group > compact group > Stephan's Quartet

Stephan's Quartet
subject			fact

Stephan's Quartet	has number of galaxies 4
	is an instance of compact group
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