This just released image shows an X-ray view from the orbiting Chandra X-ray observatory overlaid on a visible light image of galaxy cluster Abell 520 The
optical part shows stars in our Milky Way and galaxies belonging to
the cluster. The red glow is the x-rays from normal matter heated to
millions of degrees in the cluster. The blue denotes the location of
the dark matter in the cluster, inferred by its distortion of the coordinates of
background galaxies.
Bad Astonomy Blog describes how here
Paradoxically, more dark matter appears near the center of the cluster, where galaxies are few , while some areas where there are lots of galaxies show little dark matter.
This is antithetic to what theory predicts- astronomers are baffled that the collision of the Abell 520 cluster tore galaxies away from both dark
matter (blue) and the x-ray emitting hot gas clouds (magenta). The circles show where
astronomers had expected the galaxies to end up.
Credit: NASA/CXC/M. Weiss
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