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Last updated on April 16, 2014 at 15:14 EDT
XMM-Newtons Massive Discovery
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XMM-Newton’s Massive Discovery

August 27, 2008
The optical image that confirmed that 2XMM J083026+524133 is a distant cluster of galaxies, taken by the Large Binocular Telescope in Arizona. The X-ray emission from the cluster of galaxies is shown in blue at the centre of the image. The individual galaxies in the cluster are the small dots inside the blue glow.