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Last updated on April 20, 2014 at 5:20 EDT
Hickson Galaxy Group HCG16
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Hickson Galaxy Group (HCG16)

January 24, 2013
XMM brings to bear the largest X-ray telescopes in space, and this is shown here. These colliding galaxies are 170 million light years away, and are clearly visible to EPIC. In the background more than a hundred faint X-ray sources are seen, most of these are new detections by XMM. ESA