Sphere of influence (black hole)

The "sphere of influence" of a black hole refers to the region around the black hole where its gravitational influence dominates over the gravitational influences of other surrounding celestial bodies. In more specific terms, it is the area within which the gravitational pull of the black hole is strong enough to significantly affect the motion of objects, such as stars or gas, compared to other gravitational sources in the vicinity (like other stars or galaxies).