Sequence of Andromeda Galaxy (M31) Images
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Beginning with a wide-field optical view, this sequence of Andromeda Galaxy images moves into an X-ray look of the central region. In this Chandra image, red represents lower energy, green as medium energy, and finally blue as the highest energy X-rays that Chandra detects. This sequence also shows a composite of X-ray and infrared light, before returning to the Chandra-only view.
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(Credit: X-ray: NASA/UMass/Z.Li & Q.D.Wang; Optical: NOAO/AURA/NSF/T.A.Rector & B.A.Wolpa; Infrared: NASA/JPL-Caltech)