Your question harps on a fascinating conundrum of astrophysics involving black holes. The gravitational pull of a black hole is immense and nothing not even light can return once it reaches near the event horizon. However, the study of astrophysics is always pregnant with all sorts of quirky ifs and buts that never fail to grab our attention.

One such hypothetical phenomenon is “Hawking radiation”, named after the renowned astrophysicist Stephen Hawking. In this situation, Hawking radiation posits, a black hole can emit radiation due to quantum effects near its event horizon. Owing to this radiation, black holes can lose their mass over a humongous time and be depleted of everything.

Another event of the same ilk happens near the accretion disk of the black holes. The jets of matter swirling into the black holes form an accretion disk or the event horizon that emits radiation. In such a case, matters coming near the vicinity of the black holes can form jets of particles that get emitted almost at the speed of light near the poles of black holes, perpendicular to the accretion disk. So, in such situations matters or particles can get effectively repelled by a black hole.

Black holes are matters of intriguing interest to scientists and space connoisseurs alike. These fascinating entities spew more questions than answers. And it is one of the riveting phenomena of astrophysics to date.