Evaporation of a Black Hole

Evaporation of a Black Hole
Throughout the universe, pairs of virtual particles spontaneously appear and disappear so quickly that they do not violate any laws of nature. The tidal
force just outside of the event horizon of a black hole is strong enough to tear apart two virtual particles that appear there before they destroy each
other. The gravitational energy that goes into separating them makes them real and, therefore, permanent. At least one of each pair of newly created
particles falls into the black hole. Sometimes the other particle escapes into the universe. Because the gravitational energy used to create the particles
came from the black hole, the hole loses mass and shrinks, eventually evaporating completely. Here we see just a few particles in the making: an
electron (e–), a positron (e+), and a pair of photons (γ).