If microscopic black holes born a fraction of a second after the Big Bang exist, then at least one may fly through the solar system per decade, generating tiny gravitational distortions that scientists can detect.

Researchers at MIT suggest that the microscopic "primordial black holes" could be blasting through our solar system at least once every ten years. These tiny black holes could be extremely dense, they suggest,

Astronomers have observed three types of black holes in the universe. Stellar-mass black holes formed from the collapse of a massive star, intermediate mass black holes found in some star clusters, and supermassive black holes that lurk in the centers of galaxies.