XMM-Newton’s massive discovery   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.   The image in which 2XMM J083026+524133 was dicovered, taken by the EPIC camera onboard ESA’s XMM-Newton observatory. 2XMM J083026+524133 was captured unexpectedly to the right of the image. XMM-Newton’s target for this observation was the bright spot in the upper left, an active galaxy. Release date: 25 August 2008