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In the realm of cosmic phenomena, black holes are one of the most enigmatic and intriguing entities. According to Einstein’s Theory of Relativity, black holes are formed from the remnants of massive stars. When such a star has exhausted the nuclear fuel, it undergoes a dramatic collapse under the force of gravity, leading to a singularity, a point of infinite density. This singularity is encapsulated by an event horizon, an invisible boundary beyond which nothing, not even light, can escape. Hence, black holes are truly "black" as they do not emit any radiation that can be detected with our current technology.

Another curious property of black holes is their intense gravitational pull. This gravitational force is so strong that it bends space-time around it, creating what is known as gravitational lensing. Such lensing can cause distant stars to appear distorted or multiply imaged when viewed from Earth. This has been empirically confirmed through observations made using advanced telescopes.

Furthermore, black holes also hold a major position in the study of quantum mechanics. Theoretical physicist Stephen Hawking's ground-breaking work posited the existence of Hawking radiation, thermal radiation theoretically emitted by black holes. Contradictorily, this suggests that black holes are not entirely 'black' but emit faint radiation due to quantum effects near the event horizon.

Even with decades of intensive study and myriad of discoveries, black holes remain enigmatic. Their existence challenges our understanding of the universe, pushing the boundaries of physics, philosophy, and human imagination alike.