Spectral lines are useful in classifying stars because they show the composition of a star.
Why are spectral lines useful in classifying stars?(1 point)
Responses
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.
They show a star's location.
They show the layers that make up a star.
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