NGC 4631 Composite (Stacked)
This image shows the black-and-white optical view, the X-ray/ultraviolet composite, and X-ray and H-alpha emission composite as they appear when overlaid with one another.

Scale: Central Region: 2.5 arcmin on a side.
Whole Galaxy: 8.2 arcmin on a side.

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Image Credit:
X-ray:
NASA/UMass/D.Wang et al.
Optical: NASA/HST/D.Wang et al., UV: NASA/GSFC/UIT
Black & White Optical: NOAO/AURA/NSF.