Orion OB association

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Orion OB association [ə‚rī·ən ¦ō′bē ə‚sō·shē‚ā·shən]

(astronomy)

A loose, gravitationally unbound grouping of hot massive stars with spectral types A, B, and O, which originated in the giant molecular clouds Orion A and Orion B, together with tens of thousands of low-mass young stars which formed from the Orion molecular clouds.

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No references found			origin server Original original construction original dip original document original duration Original Equipment Manufacturer Original Gullah Festival original interstice original lean-to original sin original valley Orillia orillon Orin-Nur Orinoco Orinoco River Oriol, Father Oriole Orion Orion A Orion arm Orion B Orion molecular clouds Orion Nebula Orion OB association Orion spur Orionids ORiordan, Michael Oriskany Battlefield State Historic Site Orissa Oriya Oriya Literature Orizaba Orkan, Wladyslaw Orkhan Orkhon Orkhon Turks Orkhon-Enisei Inscriptions ORKID Orkla Orkney Islands Orkut Orlando Orlando Di Lasso Orlando Furioso Orlando Innamorato Orlando, Vittorio Emanuele orle Orleanais Orléanais			oriole oriole Oriole Park at Camden Yards Orioles Orioles Orioles Oriolidae Oriolus Oriolus Oriolus oriolus Orion Orion Orion Orion (disambiguation) Orion (disambiguation) Orion A Orion Arm Orion B Orion Bus Industries Orion Display Technology Orion Grassroots Network Orion Group Software Engineers Orion laser system Orion Marine Group Inc Orion Metal Trading Corporation Orion molecular cloud Orion molecular clouds Orion Nebula Orion Nebula Cluster Orion Network Systems, Inc Orion OB association Orion Remote Method Invocation Orion School and Foundation for Astrology Orion Spur Orion String Quartet Orion Township Public Library Orion Virtual Power Plant Orionid meteor shower Orionids Orions Orions Orions ORiordan, Michael ORIP Oris Oris Orisa Orisa ORISE Orisha Orishas Oriskany Oriskany Battlefield State Historic Site Oriskany period Orismological Orismology orison Orison (spirituality) Orison (spirituality) Orison (spirituality) Orison (spirituality)

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