tiān / wén / xué / jiā / tōng / guò / àn / xiàn / guāng / pǔ / fēn / xī / héng / xīng / dà / qì / de / chéng / fèn天文学家通过暗线光谱分析恒星大气的成分。Astronomers analyze the composition of stellar atmospheres through dark-line spectra.