When two black holes merge, the resulting black hole can zoom off at speed
brightstars/Getty Images
Black holes have a speed limit. When two black holes collide, the larger black hole created in the merger can be blasted off by the energy of the collision, and now we know the highest speed possible from this recoil process.
When black holes smash together and merge, they radiate some of their energy in the form of gravitational waves, which are ripples in the fabric of space-time. Usually, these waves are emitted equally in all directions,…