Black holes come in a variety of sizes, ranging from ten times the mass of the sun to a billion times as massive. Black holes are well known for their ability to pull matter into them. Not all materials near a black hole are lost however.
Some bits of matter just outside the point of no return (called the event horizon) are accelerated away at near light speeds, creating jets of particles shooting out above and below the black holes. These Gamma-ray jets are so powerful that they create changes in the host galaxy and effect the surrounding space.
iNews – Crickey Curacao / Space.com