OB association

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OB association [¦ō′bē ə‚sō·sē′ā·shən]

(astronomy)

A grouping of very young, very hot massive stars of spectral types O and B that has not had time to disperse.

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No references found			About 35 of the thousands of stars in this group, known as the Scorpius-Centaurus (Sco-Cen) OB association, weigh several times as much as the sun. Supernova dealt deaths on earth? Stellar blasts may have killed ... by Cowen, R / Science News			Oakwood Lakes State Park OAM OAP Oar Oarfish oarsman Oases oasis OASIS Open Document Format for Office Applications Oasis State Park OASM system oat Oates Oates Coast Oates, Joyce Carol Oates, Titus oath Oath Monday Oath of Allegiance oatmeal oatmeal paper oats OAW Oaxaca Ob OB association Ob Bay Ob Plateau Ob River Ob Trench Ob- Ob-Irtysh Basin River Ports OBA Obabok Obadiah Obaidallah Obal Obama, Barack Hussein Oban Obasanjo Obasanjo, Olusegun Obayashi Taryo Obbligato obclavate obcordate OBDC obdiplastemonous Obdiplostemony Obdorsk obduction OBE			Oaxaca State Oaxaca State Oaxaca Study Action Group Oaxaca, Oaxaca Oaxaca, Oaxaca, Mexico - Xoxocotlan OAXAL OAXM OAXTC OAY OAYC OAYEC OAYF OAYG OAYO OAYP OAYR OAYS OAZ Oaza Rekolekcyjna Animatorow Rodzin Oaza Rekolekcyjna Diakonii Jednosci Oaza Rekolekcyjna Diakonii Liturgicznej Oaza Rekolekcyjna Diakonii Wyzwolenia Oazowej Licencji Publicznej OB OB OB OB OB ÖB OB association Ob Bay Ob Plateau Ob River Ob River Ob sea Ob Trench Ob Ugrian Ob Ugrians OB van Ob' Ob' Ob' River Ob' River OB+ ob- ob- ob- ob-gyn ob-gyn ob-gyn Ob-Irtysh Basin River Ports Ob-La-Di Ob-La-Da ob. Ob/gyn Ob/gyn OB/OD OB1 OB3 OB5 OB64

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