Dark Matter Core Defies Explanation in Hubble Image

ABOUT THIS IMAGE:

This image shows regions of hot gas at the core of merging galaxy cluster Abell 520, detected by NASA's Chandra X-ray Observatory. The gas is evidence that a collision between massive galaxy clusters took place.

Abell 520 resides 2.4 billion light-years away.

Object Name: Abell 520

Image Type: Astronomical

Credit: NASA, ESA, CXO, and M.J. Jee (University of California, Davis)

NEWS RELEASE IMAGES

The above image is part of a montage:

Montage Image: Galaxy Cluster Abell 520 (plus CFHT, HST, CFHT/HST, and CXO overlays) Image Type: Astronomical/Annotated PRC2012-10b Galaxy Cluster Abell 520 (HST-CFHT-CXO Composite) Image Type: Astronomical Galaxy Cluster Abell 520 (CFHT and HST) Image Type: Astronomical Galaxy Cluster Abell 520's Luminosity (CFHT) Image Type: Astronomical Galaxy Cluster Abell 520's Mass (HST WFPC2) Image Type: Astronomical

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