There may be a grapefruit-sized black hole in the solar system

A black hole the size of a grapefruit can hide in our solar system, American astrophysicists say.

An invisible object seems to interact with other objects at the edge of the system, and researchers do not know exactly what it is. Theories included the presence of the “ninth planet,” but scientists are increasingly inclined to believe that it may be a tiny black hole.

Harvard University experts, in collaboration with the Black Hole Initiative, want to test this theory. Researchers plan to search for the object using data from the Legacy Survey of Space Time. They intend to analyze mission data to look for signs of accretion flares that are created when objects are too close to a black hole.