Through a spectroscope, you see what's called an absorption spectrum.

通过分光镜，你可以看到所谓的吸收光谱。

While we’re observing these stars, we can use a spectrometer, the device that separates wavelengths, to reveal the star’s absorption spectrum and its elemental composition.

在观察这些恒星时，我们可以使用分光计（一种分离波长的设备）来揭示恒星的吸收光谱及其元素组成。