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19 July, 13:03

Describe how astronomers determine the composition of a star.

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  1. 19 July, 16:58
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    Scientists use spectrography to determine the chemical composition of a star. The short version is that as light bounces off of atoms, different atoms will absorb different wavelengths of light. So by using a spectrograph, scientists can view each spectrum of light coming from a star, and determine the composition based off of the dark areas in the spectrograph.
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