Question

question 36
what do spectral lines tell astronomers about stars?
the color of the star.
the age of the star.
the size of the star.
the elements present in the star.

Explanation:

Spectral lines are unique for each element. By analyzing them, astronomers can identify the elements present in a star. Color is related to temperature, age and size are not directly determined by spectral lines alone in the way elements are.

Answer:

The elements present in the star.