It was an absorption spectrum, and it had a bunch of the same dark lines Fraunhofer had seen in our sun's spectrum.

这是一个吸收光谱，它有一堆和弗劳恩霍夫在太阳光谱的一样的黑线。

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

通过光镜，你可以所谓的吸收光谱。

But when we study very distant bodies, we find that their absorption spectrum is slightly different from what we’d expect, given our knowledge of typical star compositions.

但当们研究非常遥远的天体时，们会发现它们的吸收光谱与们根据典型恒星所预期的略有不同。

Evidence came from spectral lines both emission and absorption spectrum and then the photoelectric effect which we will get into in just a second.

证据来自于发射光谱和吸收光谱的光谱线，以及光电效应，们马上就会进入。

And we can even look at an absorption spectrum of the leaf itself.

们甚至可以观察叶子本身的吸收光谱。

But when we study very distant bodies, we find that their absorption spectrum is slightly different from what we'd expect, given our knowledge of typical star compositions.

但是当们研究非常遥远的天体时，们发现它们的吸收光谱与们预期的略有不同，因为们对典型恒星组的了解。

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.

当们观察这些恒星时，可以使用光计这种能离波长的设备来揭示恒星的吸收光谱及其元素组。