The spectra of the coolest stars contain strong absorption features (or lines) of

Question

Quizplus · Accepted Answer

The absorption features in the spectra of the coolest stars are due to the presence of TiO molecules. These molecules form at the relatively low temperatures found in the cooler stars, and their absorption lines dominate the spectrum in the visible and near-infrared parts of the spectrum. The other choices (B-D) may be present in the spectra of stars, but they are not specific to the coolest stars.

The Spectra of the Coolest Stars Contain Strong Absorption Features