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physical object > natural object > celestial body > collection of stars > association > OB association > Perseus OB2

Perseus OB2 comparison table

Subject	has definition	has distance	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
Perseus OB2	A young association of OB stars.	350 pc		OB association

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