Spectral lines are useful in classifying stars because they show the composition of a star. Spectral lines correspond to specific wavelengths of light absorbed or emitted by elements in a star's atmosphere, allowing astronomers to determine which elements and compounds are present, as well as other important properties like temperature and density.
Why are spectral lines useful in classifying stars?(1 point) Responses They show the layers that make up a star. They show the layers that make up a star. They indicate a star's age. They indicate a star's age. They show the composition of a star. They show the composition of a star. They show a star's location
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