Planet discovered at edge of solar system could actually be black hole  NEWS.com.auPlanet Nine could be a primordial black hole, new research suggests  Phys.orgIs “Planet 9” actually a primordial black hole?  MIT Technology ReviewIs there a black hole hiding right here in our solar system?  BGRMysterious Planet X may be black hole that’s ’10 times heavier than Earth but the size of a bowling ball’ on e  New York Post View full coverage on Google News