O-type stars are among the most massive and hottest known, pounding
their surroundings with intense ultraviolet light and powerful outflows
called stellar winds. NASA's Swift and ESA's XMM-Newton X-ray
observatories took part in a 2011 campaign to monitor the interaction of
two O stars bound together in the same binary system: Cygnus OB2 #9.
Credit: NASA's Goddard Space Flight Center
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