The Expanding Light Echoes of SN 1987A . ... Credit Copyright: The SuperMACHO Team , CTIO , NOAO , NSF Explanation: Can you find supernova 1987A? It isn't hard -- it occurred at the center of the expanding bullseye pattern. ... The first image is an image of the SN 1987A region, while the next four images were created by subtracting consecutive images, taken a year apart, and leaving only the difference between the images. Light echoes can be seen moving out from the position of the supernova. ...