Quasars are the bright centers of young galaxies powered by supermassive black holes. Most quasars are very distant and faint, making them difficult to observe. One quasar, 0957+561, is ...
The Double Quasar, QSO 0957+561, is a gravitationally lensed image of a single quasar located 7.8 billion light-years away, appearing as two distinct but identical entities due to an intervening ...
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