It started slowly, but as they emitted gravitational waves, they grew closer together, accelerating in speed, until, when they were revolving at almost the speed of light, they fused into a single black hole that had 60 times the mass of the Sun, but compressed into the space of 360 kilometers.
Sākumā lēni, bet tad, radot gravitācijas viļņus, tie tuvojās viens otram, ātrums pieauga, līdz, virpuļodami gandrīz gaismas ātrumā, tie saplūda vienā melnajā caurumā, kura masa bija līdzvērtīga 60 saulēm, taču saspiesta 360 kilometros.