DR DAVID ROBERTS / SCIENCE PHOTO LIBRARY DR DAVID ROBERTS / SCIENCE PHOTO LIBRARY
Radio map of the double quasar (0957+561), taken with the Very Large Array (VLA) radio telescope, New Mexico. These two images of a single distant quasar are the result of the gravitational bending of light from the quasar by an intervening body. Image A is the dark blue source at upper centre, which is emitting radio jets (yellow & blue) on either side. Image B is the dark blue object directly below A; the jets have not been doubly imaged. The faint yellow image just above B coincides with the centre of a large galaxy observed in optical light, which, along with the rich cluster of galaxies it lies in, is believed to be acting as the gravitational lens.
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