Positrons and electrons annihilated each other, emitting gamma rays detected by Fermi's gamma-ray burst detector, researchers said.
正电子和电子会相互湮灭而发射出的伽玛射线,再由费米的爆发检测器所检测到,研究人员说。
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It activates a gamma-raydetector that will spot a nuclear blast as much as 100 miles away and instantly shut all the airvents. He had it tested before moving in.