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I · THE SUN
![](http://upload.wikimedia.org/wikipedia/commons/9/93/Illustrated_Astronomy_35a.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/8/80/Illustrated_Astronomy_35b.jpg)
The light of the stars interacts with electrons within atoms. Photons with the exact energy are absorbed and drive electrons to higher energy levels. If the electron drops to a less energetic level, it emits a photon but not necessarily in the first direction.
Analyzing the light of the stars, we observe fewer photons with specific energy, which provides information about atoms in their atmosphere.
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