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physical object > natural object > celestial body > collection of stars > association > Sco-Cen association

Sco-Cen association comparison table

Subject	is part of	is a kind of	is an instance of	has definition	has distance
association		collection of stars		A sparsely populated grouping (mass range 102-103 Msun) of very young, massive stars lying along a spiral arm of the Milky Way, whose spectral types or motions in the sky indicate a common origin. The star density is insufficient for gravitation to hold the group together against shear by differential galactic rotation, but the stars have not yet had time to disperse completely. OB associations are composed of stars of spectral types O-B2; T associations have many young T Tauri stars. The internationally approved designation for associations is the name of the constellation followed by an arabic numeral - e.g., Perseus OB2.
Sco-Cen association	Gould Belt		association	An association of very young stars. The most luminous member is a B star of Mv = - 4.9.	200 pc

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