Black holes emit radiation from "summary" of A Breif History of Time and the Universe in a Nutshell by Stephen Hawking
According to the theory of quantum mechanics, pairs of particles and antiparticles are constantly being created out of nothing near the event horizon of a black hole. One of these particles falls into the black hole, while the other escapes into space. This process causes the black hole to lose mass, as the particle that falls in carries negative energy with it. As a result, the black hole appears to emit radiation, known as Hawking radiation. Hawking radiation is a form of thermal radiation that is emitted by black holes due to quantum effects near the event horizon. The energy for this radiation comes from the black hole itself, which loses mass as the radiation is emitted. This process is significant because it suggests that black holes are not completely black, as was previously believed. Instead, they can emit radiation and eventually evaporate over time. The emission of Hawking radiation has profound implications for the nature of black holes and the universe as a whole. It implies that black holes are not truly black, as they can release energy in the form of radiation. This radiation carries information about the black hole's mass, charge, and angular momentum, providing insights into its properties. Furthermore, the process of black hole evaporation through Hawking radiation suggests that black holes have a finite lifespan and will eventually disappear entirely.- The concept of black holes emitting radiation challenges our previous understanding of these mysterious objects. It highlights the interconnectedness of quantum mechanics and general relativity, as well as the dynamic nature of the universe. By studying Hawking radiation, scientists can gain valuable insights into the behavior of black holes and the fundamental laws of physics that govern the cosmos.
