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