另一台设备，探测中子与不同化学分子碰撞后产生的不同伽马射线。
The other device can detect the distinctive gamma rays produced by collisions of neutrons with the atoms of different chemical elements.
“从这点上说，水星巨大核心的起源仍然是一个谜，”华盛顿·卡内基研究所的天体化学家，X射线光谱仪研究的领军人物Larry Nittler如是说。
"At this point, the origin of Mercury's large core is still a mystery," said Larry Nittler, a cosmochemist at the Carnegie Institution of Washington who led the X-ray spectrometer study.
X射线就像探针一样，可以检测到组成化石的单一化学成分。
The X-rays acted as probes, detecting the individual chemical building blocks that make up the fossil.
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