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physical object > natural object > celestial body > collection of stars > star system > binary star > close binary > nova > dwarf nova > SU Ursa Major
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SU Ursa Major comparison table
Subject is part of is an instance of is a kind of has definition
dwarf nova  novaCataclysmic variable in which the brightness increases suddenly at intervals ranging from several days to years.
SU Ursa MajorMilky Waydwarf nova  

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