This composite shows a classic example of mixed-morphology supernova remnant known as W28.

This composite shows a classic example of a mixed-morphology supernova remnant known as W28. The background stars and fine structure are seen in optical light (grey and white) by CTIO. The radio (orange) data are from the VLA, while the wide-field X-rays (blue) come from the ROSAT satellite. The white-bordered region of the center from Chandra (low-energy X-rays are red, the medium are green, and the high range is blue) shows the shape and extent of the high-energy emission in that region. By studying W28 and others like it, astronomers hope to better understand the complexities involved when a star explodes in a crowded neighborhood.

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