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U.S. Department of Defense sent this bulletin at 12/01/2012 07:42 AM EST
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12/01/2012 06:22 AM CST
The Milky Way and other galaxies in the universe harbor many young star clusters and associations that each contain hundreds to thousands of hot, massive, young stars known as O and B stars. The star cluster Cygnus OB2 contains more than 60 O-type stars and about a thousand B-type stars. Deep observations with NASA’s Chandra [...]
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