Aboutl.3billionyearsago,twomassiveblackholeshiteachothe...
问题详情：Aboutl.3billionyearsago,twomassiveblackholeshiteachotherandformedanewone.Theenergysetfreebythecollision(撞击)createdaripple(波纹)inthespace-timestructureandspreadoutwardingravitationalwaves(引...