You see here, first of all, the emissionlines which are measured in the laboratory that I just showed you. They are always done simultaneously with the measurements.
看这里,首先,这些发射谱线,就是我刚给你们看的,实验室里测量的,它们在测量同时,就能得到。
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They used spectroscopy for their analysis: a technique that breaks the light from celestial objects into a spectrum with telltale emissionlines indicating which elements are present.