NGC 4631: X-ray/Ultraviolet composite
This image shows the spiral galaxy NGC 4631 as seen edge-on from NASA's Chandra X-ray Observatory and Ultraviolet Imaging Telescope (UIT). The Chandra data (shown in blue and purple) provide the first unambiguous evidence for a halo of hot gas surrounding a galaxy that is very similar to our Milky Way. The orange colour in the middle of the image represents ultraviolet radiation as observed by UIT, tracing massive stars in the galaxy.
 
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Image Credit:
X-ray: NASA/UMass/D.Wang et al.