Stars aborning

Below is the Flame nebula as a composite image from the Chandra and Spitzer telescopes. It shows that the stars at the edge of the nebula are older than the ones at the center (Credit: X-ray: NASA/CXC/PSU/K.Getman, E.Feigelson, M.Kuhn & the MYStIX team; Infrared:NASA/JPL-Caltech):

flame

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