If absorption lines of sodium are not present in a star's spectrum, the star must not contain any sodium.

Question

Quizplus · Accepted Answer

The absence of sodium absorption lines in a star's spectrum does not necessarily mean the star contains no sodium. It could mean that the sodium is not in the correct state (e.g., temperature or ionization level) to produce visible absorption lines under the conditions present in the star's atmosphere.

If Absorption Lines of Sodium Are Not Present in a Star's