Five billion light-years away, the giant elliptical galaxy 3C295 is a prodigious source of energy at radio wavelengths . The X-ray and radio emission are believed to be the result of an explosive event triggered when too much material flowed into a supermassive black hole at the heart of the giant galaxy. Additionally, the Chandra picture beautifully reveals an extensive cloud of 50 million degree gas surrounding 3C295 . Embedded in the cloud is a cluster of about 100 galaxies, too cool to be seen in the X-ray picture. However, X-ray data indicate that there is still not enough observed mass to hold the cloud and cluster together gravitationally, suggesting the presence of large amounts of dark matter .
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