Black holes may be hurtling around at 10 per cent the speed of light

Artist's impression of a binary black hole system

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, …

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