AIR & SPACE MAGAZINE X-Ray of an Evolution A planetary nebula inside a planetary nebula. Inset X-ray (NASA/CXC/IAA-CSIC/M.Guerrero et al); Inset Optical (NASA/STScI); Widefield X-ray (ESA/XMM-Newton); Widefield Optical (NSF/NOAO/KPNO) November 16, 2012 Matt Hale Get the latest stories in your inbox every weekday.
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