CELESTIAL IMAGE CO. / SCIENCE PHOTO LIBRARY CELESTIAL IMAGE CO. / SCIENCE PHOTO LIBRARY
Fornax A galaxy. Optical image of the radio galaxy Fornax A (NGC 1316) with the smaller galaxy NGC 1317 above it. North is at top. Fornax A is a powerful source of radio waves which extends far beyond the visible confines of the galaxy. These galaxies are members of the Fornax cluster, a gravitationally linked group of 18 galaxies which lies around 70 million light years from Earth in the constellation Fornax. The radio emission of Fornax A is powered by a massive black hole at the galaxy's centre. There is evidence that Fornax A has engulfed smaller members of the cluster in the past, and material from these galaxies falling onto the black hole powers the radio emission.
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