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This visible-light image from the Sloan Digital Sky Survey shows spiral galaxy NGC 7331, center, where astronomers observed the unusual supernova SN 2014C .
The inset images are from NASA's Chandra X-ray Observatory, showing a small region of the galaxy before the supernova explosion (left) and after it (right). Red, green and blue colors are used for low, medium and high-energy X-rays, respectively.
A version of this image without annotations is also available above. See PIA21089 for a related image.
For more Chandra images, multimedia and related materials, visit:http://www.nasa.gov/chandra.