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physical object > natural object > celestial body > collection of stars > association > OB association > Carina OB 2
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Carina OB 2 comparison table
Subject is part of has definition is a kind of is an instance of
OB association A loose gathering of O and B stars that typically stretches over hundreds of light-years and contains a few dozen OB stars.association 
Carina OB 2CarinaA rich association of OB stars near η Carinae. OB association

Next OB associationh and Chi Persei    UpOB association    Previous OB associationScorpius OB1