Black holes are regions of spacetime where gravity is so extreme that nothing, not even light, can escape.
"For starters, space is aptly named," Doug Gobielle, a professor in the physics department at the University of Rhode Island, told."The overall average luminous matter density of the universe is about one proton [a particle of light] per cubic meter. In the galaxy and the solar system this density is significantly higher, but still almost non-existent."
"Stars do wander close enough, from time to time, to dislodge a few comets from the farthest outer regions of the solar system, called the Oort Cloud, but this is the extent of their gravitational impact on the solar system and it would likely be the same case for any black holes or other compact masses which would wander, by happenstance, past the solar system.
Black holes come in two main size classes: stellar and supermassive . Stellar black holes tend to have masses several times greater than our sun. Supermassive black holes, on the other hand, can have masses ranging from millions to billions of solar masses. "[But] even a large stellar-mass black hole, say 30 solar masses, would have to be closer than Neptune to begin to have gravitational impacts on Earth, and about the distance of Jupiter to pull on Earth with roughly equal gravitational force to sun's gravitational hold on Earth," he said.
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