Is 'Planet Nine' actually a grapefruit-sized black hole? Big new telescope could find out

Is 'Planet Nine' actually a grapefruit-sized black hole? Big new telescope could find out
By

A coming sky survey will help test a wild idea — that a grapefruit-sized black hole lurks undiscovered in the outer solar system.



July 11, 2020 at 05:14PM
via Space.com read more...