What is Hawking radiation, which states black holes 'glow'?
In 1975, Stephen Hawking published a "shocking" theory, stating that black holes are not quite black and glow slightly with "Hawking radiation", consisting of particles like photons and neutrinos. Although never observed directly until now, the radiation is proposed to occur due to the black hole capturing one of the particle-antiparticle pairs created near event horizon, black hole's boundary.