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• Aboutl.3billionyearsago,twomassiveblackholeshiteachothe...

• 问题详情：Aboutl.3billionyearsago,twomassiveblackholeshiteachotherandformedanewone.Theenergysetfreebythecollision(撞击)createdaripple(波纹)inthespace-timestructureandspreadoutwardingravitationalwaves(引力波).   Then,onSeptember14,2015,agroupofscient...
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