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NGC 4631
(X-ray: NASA/UMass/D.Wang et al., Optical: NASA/HST/D.Wang et al.)

NGC 4631 is a spiral galaxy about 25,000 light years from Earth. Chandra's observations of NGC 4631 reveal a giant halo of hot gas (shown in blue and purple) surrounding the galaxy. The structure across the middle of the image and the extended faint filaments (shown in red-orange) represent data from Hubble that reveal giant bursting bubbles created by merging clusters of massive stars.
NGC 4631 Photo Album Page

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Chandra X-Ray Observatory