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Aboutl.3billionyearsago,twomassiveblackholeshiteachothe...
問題詳情:Aboutl.3billionyearsago,twomassiveblackholeshiteachotherandformedanewone.Theenergysetfreebythecollision(撞擊)createdaripple(波紋)inthespace-timestructureandspreadoutwardingravitationalwaves(引...
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