Mysterious X-ray Signal Hints of Dark Matter

June 25, 2014 4:40 PM

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A mysterious X-ray signal is emitting from the Perseus galaxy cluster, leaving astronomers scratching their heads. There are several exciting possibilities of what could be causing this, including the decay of dark matter factors called "sterile neutrinos."

The ray in question is an X-ray emission line - a spike of intensity in a very specific wavelength of X-ray light, as observed by NASA's Chandra X-ray Observatory and European Space Association's XMM-Newton. The emission line was first discovered during a detailed study of 73 galaxy clusters, includ...

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