NGC 4631: Black-and-white optical image
This is an optical image of the spiral galaxy NGC 4631. The two boxes on this image represent the areas covered by:

1. X-ray/ultraviolet composite

2. X-ray/optical composite.

Click here to go to a 'stacked' composite image, which overlays all both of these images onto the black and white optical one.
 
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Image Credit: NOAO/AURA/NSF