JULIAN BAUM / SCIENCE PHOTO LIBRARY JULIAN BAUM / SCIENCE PHOTO LIBRARY
Artist's impression of the heart of the active galaxy M87 (Virgo A, NGC 4486, 3C 274). Located some 50 million light years away, M87 is a giant elliptical galaxy which is believed to have a black hole, with a mass of 5000 million Suns, at its centre. Two opposed jets of material, one much brighter than the other, have been ejected from the galaxy's nucleus. The brighter of the two jets (top) extends some 5000 light years outwards from the core.
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