Two colliding black holes send ripples through the space-time fabric of the Universe that are called gravitational waves. It is possible for two black holes to collide. Once they come so close that they cannot escape each other's gravity, they will merge to become one bigger black hole.
Hawking Radiation and Dissolving Black Holes. Unless this creation of two virtual particles happens right at the event horizon of a black hole. If a particle and its antiparticle pop into being on the event horizon, one gets sucked in. The other gets away.Sep 9, 2014