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Is ‘Planet Nine’ a grapefruit-sized black hole? A big new telescope could find out



An upcoming sky survey will help test a wild idea – that a black hole the size of a grapefruit lurks undetected in the outer solar system.

In recent years, researchers have found a strange cluster in the orbits of several transneptunical objects (TNOs) that are located in the dark depths of the outermost solar system. Some scientists have hypothesized that the pathways of TNOs were shaped by the attraction of a large object that is five to ten times as massive as Earth (although others believe that TNOs may only be pulling together).


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