Question

How does looking at a spectrum tell us what a star is made of?

Answer 1

Thus, astronomers can identify what kinds of stuff are in stars from the lines they find in the star's spectrum.

From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star. The spectral line also can tell us about any magnetic field of the star.

Answer 2

ANSWER

Thus, astronomers can identify what kinds of stuff are in stars from the lines they find in the star's spectrum. ... From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star. The spectral line also can tell us about any magnetic field of the star.

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