NOAO / SCIENCE PHOTO LIBRARY NOAO / SCIENCE PHOTO LIBRARY
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Optical photograph of quasar 3C 273 (centre), showing its faint jet extending outwards at lower right. The quasar itself is thought by most astronomers to be a black hole lying at the centre of a faint, distant galaxy. The jet is a powerful beam of fast-moving charged particles ejected from the nucleus and extends an estimated 1.2 million light years out into space. Earth. See New Astronomy page 228.
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